diff --git a/fortran/src/H5VLff.F90 b/fortran/src/H5VLff.F90
index eea9dfedb0..32dd7d786c 100644
--- a/fortran/src/H5VLff.F90
+++ b/fortran/src/H5VLff.F90
@@ -124,13 +124,14 @@ CONTAINS
   END SUBROUTINE H5VLregister_connector_by_value_f
 
 !
-!****s* H5VL/H5VLis_connector_registered_f
+!****s* H5VL/H5VLis_connector_registered_by_name_f
 !
 ! NAME
-!  H5VLis_connector_registered_f
+!  H5VLis_connector_registered_by_name_f
 !
 ! PURPOSE
-!  Tests whether a VOL class has been registered or not.
+!  Tests whether a VOL class has been registered or not
+!  according to a specified connector name.
 !
 ! INPUTS
 !  name - Connector name
@@ -139,7 +140,7 @@ CONTAINS
 !  hdferr - Returns 0 if successful and -1 if fails
 ! SOURCE
 
-  SUBROUTINE H5VLis_connector_registered_f(name, registered,  hdferr)
+  SUBROUTINE H5VLis_connector_registered_by_name_f(name, registered,  hdferr)
     IMPLICIT NONE
     CHARACTER(LEN=*), INTENT(IN) :: name
     LOGICAL, INTENT(OUT) :: registered
@@ -149,22 +150,63 @@ CONTAINS
     INTEGER(C_INT) :: registered_c
 
     INTERFACE
-       INTEGER(C_INT) FUNCTION H5VLis_connector_registered(name) BIND(C,NAME='H5VLis_connector_registered')
+       INTEGER(C_INT) FUNCTION H5VLis_connector_registered_by_name(name) BIND(C,NAME='H5VLis_connector_registered_by_name')
          IMPORT :: C_CHAR
          IMPORT :: C_INT
          CHARACTER(KIND=C_CHAR), DIMENSION(*), INTENT(IN) :: name
-       END FUNCTION H5VLis_connector_registered
+       END FUNCTION H5VLis_connector_registered_by_name
     END INTERFACE
     
     c_name = TRIM(name)//C_NULL_CHAR
-    registered_c = H5VLis_connector_registered(c_name)
+    registered_c = H5VLis_connector_registered_by_name(c_name)
 
     hdferr = 0
     registered = .FALSE.
     IF(registered_c .GT. 0) registered = .TRUE.
     IF(registered_c .LT. 0) hdferr = INT(registered_c)
 
-  END SUBROUTINE H5VLis_connector_registered_f
+  END SUBROUTINE H5VLis_connector_registered_by_name_f
+
+!
+!****s* H5VL/H5VLis_connector_registered_by_value_f
+!
+! NAME
+!  H5VLis_connector_registered_by_value_f
+!
+! PURPOSE
+!  Tests whether a VOL class has been registered or not
+!  according to a specified connector value (ID).
+!
+! INPUTS
+!  value - Connector value
+! OUTPUTS
+!  registered - state of VOL class registration 
+!  hdferr - Returns 0 if successful and -1 if fails
+! SOURCE
+
+  SUBROUTINE H5VLis_connector_registered_by_value_f(value, registered,  hdferr)
+    IMPLICIT NONE
+    INTEGER, INTENT(IN) :: value
+    LOGICAL, INTENT(OUT) :: registered
+    INTEGER, INTENT(OUT) :: hdferr
+!*****
+    INTEGER(C_INT) :: registered_c
+
+    INTERFACE
+       INTEGER(C_INT) FUNCTION H5VLis_connector_registered_by_value(value) BIND(C,NAME='H5VLis_connector_registered_by_value')
+         IMPORT :: C_INT
+         INTEGER(C_INT), VALUE :: value
+       END FUNCTION H5VLis_connector_registered_by_value
+    END INTERFACE
+
+    registered_c = H5VLis_connector_registered_by_value(INT(value,C_INT))
+
+    hdferr = 0
+    registered = .FALSE.
+    IF(registered_c .GT. 0) registered = .TRUE.
+    IF(registered_c .LT. 0) hdferr = INT(registered_c)
+
+  END SUBROUTINE H5VLis_connector_registered_by_value_f
 
 !
 !****s* H5VL/H5VLget_connector_id_f
@@ -248,6 +290,46 @@ CONTAINS
 
   END SUBROUTINE H5VLget_connector_id_by_name_f
 
+!
+!****s* H5VL/H5VLget_connector_id_by_value_f
+!
+! NAME
+!  H5VLget_connector_id_by_value_f
+!
+! PURPOSE
+!  Retrieves the ID for a registered VOL connector.
+!
+! INPUTS
+!  value - Connector value
+! OUTPUTS
+!  vol_id - Connector id
+!  hdferr - Returns 0 if successful and -1 if fails
+! SOURCE
+
+  SUBROUTINE H5VLget_connector_id_by_value_f(value, vol_id, hdferr)
+    IMPLICIT NONE
+    INTEGER, INTENT(IN) :: value
+    INTEGER(HID_T), INTENT(OUT) :: vol_id
+    INTEGER, INTENT(OUT) :: hdferr
+!*****
+    INTERFACE
+       INTEGER(HID_T) FUNCTION H5VLget_connector_id_by_value(value) BIND(C,NAME='H5VLget_connector_id_by_value')
+         IMPORT :: C_INT
+         IMPORT :: HID_T
+         INTEGER(C_INT), VALUE :: value
+       END FUNCTION H5VLget_connector_id_by_value
+    END INTERFACE
+
+    vol_id = H5VLget_connector_id_by_value(INT(value,C_INT))
+
+    hdferr = 0
+    IF(vol_id.LT.0)THEN
+       hdferr = -1
+       vol_id = H5I_INVALID_HID_F
+    ENDIF
+
+  END SUBROUTINE H5VLget_connector_id_by_value_f
+
   SUBROUTINE H5VLget_connector_name_f(obj_id, name, hdferr, name_len)
     IMPLICIT NONE
     INTEGER(HID_T), INTENT(IN) :: obj_id
diff --git a/fortran/src/hdf5_fortrandll.def.in b/fortran/src/hdf5_fortrandll.def.in
index 7e8b61134d..c792232428 100644
--- a/fortran/src/hdf5_fortrandll.def.in
+++ b/fortran/src/hdf5_fortrandll.def.in
@@ -458,9 +458,11 @@ H5T_mp_H5TENUM_INSERT_F03
 ; H5VL
 H5VL_mp_H5VLREGISTER_CONNECTOR_BY_NAME_F
 H5VL_mp_H5VLREGISTER_CONNECTOR_BY_VALUE_F
-H5VL_mp_H5VLIS_CONNECTOR_REGISTERED_F
+H5VL_mp_H5VLIS_CONNECTOR_REGISTERED_BY_NAME_F
+H5VL_mp_H5VLIS_CONNECTOR_REGISTERED_BY_VALUE_F
 H5VL_mp_H5VLGET_CONNECTOR_ID_F
 H5VL_mp_H5VLGET_CONNECTOR_ID_BY_NAME_F
+H5VL_mp_H5VLGET_CONNECTOR_ID_BY_VALUE_F
 H5VL_mp_H5VLGET_CONNECTOR_NAME_F
 H5VL_mp_H5VLCLOSE_F
 H5VL_mp_H5VLUNREGISTER_CONNECTOR_F
diff --git a/fortran/test/vol_connector.F90 b/fortran/test/vol_connector.F90
index cd05cb1a1a..d3467373cd 100644
--- a/fortran/test/vol_connector.F90
+++ b/fortran/test/vol_connector.F90
@@ -61,18 +61,18 @@ CONTAINS
     INTEGER(hid_t) :: file_id
 
     ! The null VOL connector should not be registered at the start of the test
-    CALL H5VLis_connector_registered_f( "FAKE_VOL_CONNECTOR_NAME", is_registered, error)
-    CALL check("H5VLis_connector_registered_f",error,total_error)
-    CALL VERIFY("H5VLis_connector_registered_f", is_registered, .FALSE., total_error)
+    CALL H5VLis_connector_registered_by_name_f( "FAKE_VOL_CONNECTOR_NAME", is_registered, error)
+    CALL check("H5VLis_connector_registered_by_name_f",error,total_error)
+    CALL VERIFY("H5VLis_connector_registered_by_name_f", is_registered, .FALSE., total_error)
 
     ! Register the connector by name
     CALL H5VLregister_connector_by_name_f(NATIVE_VOL_CONNECTOR_NAME, vol_id, error)
     CALL check("H5VLregister_connector_by_name_f",error,total_error)
     
     ! The connector should be registered now
-    CALL H5VLis_connector_registered_f(NATIVE_VOL_CONNECTOR_NAME, is_registered, error)
-    CALL check("H5VLis_connector_registered_f",error,total_error)
-    CALL VERIFY("H5VLis_connector_registered_f", is_registered, .TRUE., total_error)
+    CALL H5VLis_connector_registered_by_name_f(NATIVE_VOL_CONNECTOR_NAME, is_registered, error)
+    CALL check("H5VLis_connector_registered_by_name_f",error,total_error)
+    CALL VERIFY("H5VLis_connector_registered_by_name_f", is_registered, .TRUE., total_error)
 
     CALL H5VLget_connector_id_by_name_f(NATIVE_VOL_CONNECTOR_NAME, vol_id_out, error)
     CALL check("H5VLget_connector_id_by_name_f",error,total_error)
@@ -118,24 +118,24 @@ CONTAINS
 
     INTEGER, INTENT(INOUT) :: total_error
     INTEGER :: error = 0
-    
+
     LOGICAL :: is_registered = .FALSE.
     INTEGER(hid_t) :: vol_id = 0
 
 
     ! The null VOL connector should not be registered at the start of the test
-    CALL H5VLis_connector_registered_f( "FAKE_VOL_CONNECTOR_NAME", is_registered, error)
-    CALL check("H5VLis_connector_registered_f",error,total_error)
-    CALL VERIFY("H5VLis_connector_registered_f", is_registered, .FALSE., total_error)
+    CALL H5VLis_connector_registered_by_name_f( "FAKE_VOL_CONNECTOR_NAME", is_registered, error)
+    CALL check("H5VLis_connector_registered_by_name_f",error,total_error)
+    CALL VERIFY("H5VLis_connector_registered_by_name_f", is_registered, .FALSE., total_error)
 
     ! Register the connector by value
     CALL H5VLregister_connector_by_value_f(NATIVE_VOL_CONNECTOR_VALUE, vol_id, error)
     CALL check("H5VLregister_connector_by_value_f", error, total_error)
 
     ! The connector should be registered now
-    CALL H5VLis_connector_registered_f(NATIVE_VOL_CONNECTOR_NAME, is_registered, error)
-    CALL check("H5VLis_connector_registered_f",error,total_error)
-    CALL VERIFY("H5VLis_connector_registered_f", is_registered, .TRUE., total_error)
+    CALL H5VLis_connector_registered_by_name_f(NATIVE_VOL_CONNECTOR_NAME, is_registered, error)
+    CALL check("H5VLis_connector_registered_by_name_f",error,total_error)
+    CALL VERIFY("H5VLis_connector_registered_by_name_f", is_registered, .TRUE., total_error)
 
   END SUBROUTINE test_registration_by_value
 
@@ -162,23 +162,23 @@ CONTAINS
     INTEGER(hid_t) :: fapl_id
     TYPE(C_PTR) :: f_ptr
 
-    CALL H5VLis_connector_registered_f( "FAKE_VOL_CONNECTOR_NAME", is_registered, error)
+    CALL H5VLis_connector_registered_by_name_f( "FAKE_VOL_CONNECTOR_NAME", is_registered, error)
 
-    CALL check("H5VLis_connector_registered_f",error,total_error)
-    CALL VERIFY("H5VLis_connector_registered_f", is_registered, .FALSE., total_error)
+    CALL check("H5VLis_connector_registered_by_name_f",error,total_error)
+    CALL VERIFY("H5VLis_connector_registered_by_name_f", is_registered, .FALSE., total_error)
 
     ! The null VOL connector should not be registered at the start of the test
-    CALL H5VLis_connector_registered_f( "FAKE_VOL_CONNECTOR_NAME", is_registered, error)
-    CALL check("H5VLis_connector_registered_f",error,total_error)
-    CALL VERIFY("H5VLis_connector_registered_f", is_registered, .FALSE., total_error)
+    CALL H5VLis_connector_registered_by_name_f( "FAKE_VOL_CONNECTOR_NAME", is_registered, error)
+    CALL check("H5VLis_connector_registered_by_name_f",error,total_error)
+    CALL VERIFY("H5VLis_connector_registered_by_name_f", is_registered, .FALSE., total_error)
 
     CALL H5VLregister_connector_by_name_f(NATIVE_VOL_CONNECTOR_NAME, vol_id, error)
     CALL check("H5VLregister_connector_by_name_f",error,total_error)
   
     ! The connector should be registered now
-    CALL H5VLis_connector_registered_f(NATIVE_VOL_CONNECTOR_NAME, is_registered, error)
-    CALL check("H5VLis_connector_registered_f",error,total_error)
-    CALL VERIFY("H5VLis_connector_registered_f", is_registered, .TRUE., total_error)
+    CALL H5VLis_connector_registered_by_name_f(NATIVE_VOL_CONNECTOR_NAME, is_registered, error)
+    CALL check("H5VLis_connector_registered_by_name_f",error,total_error)
+    CALL VERIFY("H5VLis_connector_registered_by_name_f", is_registered, .TRUE., total_error)
 
     ! Register the connector
     CALL H5Pcreate_f(H5P_FILE_ACCESS_F, fapl_id, error)
diff --git a/java/src/hdf/hdf5lib/H5.java b/java/src/hdf/hdf5lib/H5.java
index 5b704ddbb6..872fbc7ba2 100644
--- a/java/src/hdf/hdf5lib/H5.java
+++ b/java/src/hdf/hdf5lib/H5.java
@@ -10895,9 +10895,11 @@ public class H5 implements java.io.Serializable {
     /// VOL Connector Functionality
     public synchronized static native long H5VLregister_connector_by_name(String connector_name, long vipl_id);
     public synchronized static native long H5VLregister_connector_by_value(int connector_value, long vipl_id);
-    public synchronized static native boolean H5VLis_connector_registered(String name);
+    public synchronized static native boolean H5VLis_connector_registered_by_name(String name);
+    public synchronized static native boolean H5VLis_connector_registered_by_value(int connector_value);
     public synchronized static native long H5VLget_connector_id(long object_id);
     public synchronized static native long H5VLget_connector_id_by_name(String name);
+    public synchronized static native long H5VLget_connector_id_by_value(int connector_value);
     public synchronized static native String H5VLget_connector_name(long object_id);
     public synchronized static native void H5VLclose(long connector_id);
     public synchronized static native void H5VLunregister_connector(long connector_id);
diff --git a/java/src/jni/h5vlImp.c b/java/src/jni/h5vlImp.c
index 0fee343b34..1ead30b8ea 100644
--- a/java/src/jni/h5vlImp.c
+++ b/java/src/jni/h5vlImp.c
@@ -78,11 +78,11 @@ done:
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5VLis_connector_registered
+ * Method:    H5VLis_connector_registered_by_name
  * Signature: (Ljava/lang/String;)Z
  */
 JNIEXPORT jboolean JNICALL
-Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered
+Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered_1by_1name
   (JNIEnv *env, jclass clss, jobject connector_name)
 {
     const char *volName = NULL;
@@ -91,11 +91,11 @@ Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered
     UNUSED(clss);
 
     if (NULL == connector_name)
-        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5VLis_connector_registered: VOL connector name is NULL");
+        H5_NULL_ARGUMENT_ERROR(ENVONLY, "H5VLis_connector_registered_by_name: VOL connector name is NULL");
 
-    PIN_JAVA_STRING(ENVONLY, connector_name, volName, NULL, "H5VLis_connector_registered: VOL connector name not pinned");
+    PIN_JAVA_STRING(ENVONLY, connector_name, volName, NULL, "H5VLis_connector_registered_by_name: VOL connector name not pinned");
 
-    if ((bval = H5VLis_connector_registered(volName)) < 0)
+    if ((bval = H5VLis_connector_registered_by_name(volName)) < 0)
         H5_LIBRARY_ERROR(ENVONLY);
 
     bval = (bval > 0) ? JNI_TRUE : JNI_FALSE;
@@ -105,7 +105,32 @@ done:
         UNPIN_JAVA_STRING(ENVONLY, connector_name, volName);
 
     return (jboolean)bval;
-} /* end Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered */
+} /* end Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered_1by_1name */
+
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLis_connector_registered_by_value
+ * Signature: (I)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered_1by_1value
+  (JNIEnv *env, jclass clss, jint connector_value)
+{
+    htri_t bval = JNI_FALSE;
+
+    UNUSED(clss);
+
+    if (connector_value < 0)
+        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5VLis_connector_registered_by_value: VOL connector value < 0");
+
+    if ((bval = H5VLis_connector_registered_by_value((H5VL_class_value_t)connector_value)) < 0)
+        H5_LIBRARY_ERROR(ENVONLY);
+
+    bval = (bval > 0) ? JNI_TRUE : JNI_FALSE;
+
+done:
+    return (jboolean)bval;
+} /* end Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered_1by_1value */
 
 /*
  * Class:     hdf_hdf5lib_H5
@@ -156,6 +181,29 @@ done:
     return (jlong)status;
 } /* end Java_hdf_hdf5lib_H5_H5VLget_1connector_1id_1by_1name */
 
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLget_connector_id_by_value
+ * Signature: (I)J
+ */
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_H5_H5VLget_1connector_1id_1by_1value
+  (JNIEnv *env, jclass clss, jint connector_value)
+{
+    hid_t status = H5I_INVALID_HID;
+
+    UNUSED(clss);
+
+    if (connector_value < 0)
+        H5_BAD_ARGUMENT_ERROR(ENVONLY, "H5VLget_connector_id_by_value: VOL connector value < 0");
+
+    if ((status = H5VLget_connector_id_by_value((H5VL_class_value_t)connector_value)) < 0)
+        H5_LIBRARY_ERROR(ENVONLY);
+
+done:
+    return (jlong)status;
+} /* end Java_hdf_hdf5lib_H5_H5VLget_1connector_1id_1by_1value */
+
 /*
  * Class:     hdf_hdf5lib_H5
  * Method:    H5VLget_connector_name
diff --git a/java/src/jni/h5vlImp.h b/java/src/jni/h5vlImp.h
index 6dd752907c..a58abefa00 100644
--- a/java/src/jni/h5vlImp.h
+++ b/java/src/jni/h5vlImp.h
@@ -40,13 +40,22 @@ Java_hdf_hdf5lib_H5_H5VLregister_1connector_1by_1value
 
 /*
  * Class:     hdf_hdf5lib_H5
- * Method:    H5VLis_connector_registered
+ * Method:    H5VLis_connector_registered_by_name
  * Signature: (Ljava/lang/String;)Z
  */
 JNIEXPORT jboolean JNICALL
-Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered
+Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered_1by_1name
   (JNIEnv *, jclass, jobject);
 
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLis_connector_registered_by_value
+ * Signature: (I)Z
+ */
+JNIEXPORT jboolean JNICALL
+Java_hdf_hdf5lib_H5_H5VLis_1connector_1registered_1by_1value
+  (JNIEnv *, jclass, jint);
+
 /*
  * Class:     hdf_hdf5lib_H5
  * Method:    H5VLget_connector_id
@@ -65,6 +74,15 @@ JNIEXPORT jlong JNICALL
 Java_hdf_hdf5lib_H5_H5VLget_1connector_1id_1by_1name
   (JNIEnv *, jclass, jobject);
 
+/*
+ * Class:     hdf_hdf5lib_H5
+ * Method:    H5VLget_connector_id_by_value
+ * Signature: (I)J
+ */
+JNIEXPORT jlong JNICALL
+Java_hdf_hdf5lib_H5_H5VLget_1connector_1id_1by_1value
+  (JNIEnv *, jclass, jint);
+
 /*
  * Class:     hdf_hdf5lib_H5
  * Method:    H5VLget_connector_name
diff --git a/java/test/TestH5VL.java b/java/test/TestH5VL.java
index d774dbb08e..bd660d3896 100644
--- a/java/test/TestH5VL.java
+++ b/java/test/TestH5VL.java
@@ -55,15 +55,18 @@ public class TestH5VL {
         try {
             boolean is_registered;
 
-            is_registered = H5.H5VLis_connector_registered(HDF5Constants.H5VL_NATIVE_NAME);
-            assertTrue("H5.H5VLis_connector_registered H5VL_NATIVE_NAME", is_registered);
+            is_registered = H5.H5VLis_connector_registered_by_name(HDF5Constants.H5VL_NATIVE_NAME);
+            assertTrue("H5.H5VLis_connector_registered_by_name H5VL_NATIVE_NAME", is_registered);
 
-            is_registered = H5.H5VLis_connector_registered("FAKE_VOL_NAME");
-            assertFalse("H5.H5VLis_connector_registered FAKE_VOL_NAME", is_registered);
+            is_registered = H5.H5VLis_connector_registered_by_name("FAKE_VOL_NAME");
+            assertFalse("H5.H5VLis_connector_registered_by_name FAKE_VOL_NAME", is_registered);
+
+            is_registered = H5.H5VLis_connector_registered_by_value(HDF5Constants.H5VL_NATIVE_VALUE);
+            assertTrue("H5.H5VLis_connector_registered_by_value H5VL_NATIVE_VALUE", is_registered);
         }
         catch (Throwable err) {
             err.printStackTrace();
-            fail("H5.H5VLis_connector_registered " + err);
+            fail("testH5VLnative_init(): " + err);
         }
     }
 
@@ -112,6 +115,19 @@ public class TestH5VL {
         }
     }
 
+    @Test
+    public void testH5VLget_connector_id_by_value() {
+        try {
+            long native_id = H5.H5VLget_connector_id_by_value(HDF5Constants.H5VL_NATIVE_VALUE);
+            assertTrue("H5.H5VLget_connector_id_by_value H5VL_NATIVE_VALUE", native_id >= 0);
+            assertEquals(HDF5Constants.H5VL_NATIVE, native_id);
+        }
+        catch (Throwable err) {
+            err.printStackTrace();
+            fail("H5.H5VLget_connector_id_by_value " + err);
+        }
+    }
+
     @Test
     public void testH5VLget_connector_name() {
         String H5_FILE = "testFvl.h5";
diff --git a/java/test/testfiles/JUnit-TestH5VL.txt b/java/test/testfiles/JUnit-TestH5VL.txt
index f646009d23..ff94969353 100644
--- a/java/test/testfiles/JUnit-TestH5VL.txt
+++ b/java/test/testfiles/JUnit-TestH5VL.txt
@@ -1,5 +1,6 @@
 JUnit version 4.11
 .testH5VLget_connector_id_by_name
+.testH5VLget_connector_id_by_value
 .testH5VLget_connector_id
 .testH5VLnative_init
 .testH5VLget_connector_name
@@ -8,5 +9,5 @@ JUnit version 4.11
 
 Time:  XXXX
 
-OK (6 tests)
+OK (7 tests)
 
diff --git a/src/H5VL.c b/src/H5VL.c
index 0e36bcd777..18fd3d60a6 100644
--- a/src/H5VL.c
+++ b/src/H5VL.c
@@ -216,9 +216,10 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5VLis_connector_registered
+ * Function:    H5VLis_connector_registered_by_name
  *
  * Purpose:     Tests whether a VOL class has been registered or not
+ *              according to a supplied connector name.
  *
  * Return:      >0 if a VOL connector with that name has been registered
  *              0 if a VOL connector with that name has NOT been registered
@@ -230,7 +231,7 @@ done:
  *-------------------------------------------------------------------------
  */
 htri_t
-H5VLis_connector_registered(const char *name)
+H5VLis_connector_registered_by_name(const char *name)
 {
     htri_t ret_value = FALSE;           /* Return value */
 
@@ -238,12 +239,41 @@ H5VLis_connector_registered(const char *name)
     H5TRACE1("t", "*s", name);
 
     /* Check if connector with this name is registered */
-    if((ret_value = H5VL__is_connector_registered(name)) < 0)
+    if((ret_value = H5VL__is_connector_registered_by_name(name)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't check for VOL")
 
 done:
     FUNC_LEAVE_API(ret_value)
-} /* end H5VLis_connector_registered() */
+} /* end H5VLis_connector_registered_by_name() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VLis_connector_registered_by_value
+ *
+ * Purpose:     Tests whether a VOL class has been registered or not
+ *              according to a supplied connector value (ID).
+ *
+ * Return:      >0 if a VOL connector with that value has been registered
+ *              0 if a VOL connector with that value hasn't been registered
+ *              <0 on errors
+ *
+ *-------------------------------------------------------------------------
+ */
+htri_t
+H5VLis_connector_registered_by_value(H5VL_class_value_t connector_value)
+{
+    htri_t ret_value = FALSE;
+
+    FUNC_ENTER_API(FAIL)
+    H5TRACE1("t", "VC", connector_value);
+
+    /* Check if connector with this value is registered */
+    if((ret_value = H5VL__is_connector_registered_by_value(connector_value)) < 0)
+        HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't check for VOL")
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* end H5VLis_connector_registered_by_value() */
 
 
 /*-------------------------------------------------------------------------
@@ -313,7 +343,38 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5VLpeek_connector_id
+ * Function:    H5VLget_connector_id_by_value
+ *
+ * Purpose:     Retrieves the ID for a registered VOL connector.
+ *
+ * Return:      A valid VOL connector ID if a connector with that value has
+ *              been registered. This ID will need to be closed using
+ *              H5VLclose().
+ *
+ *              H5I_INVALID_HID on error or if a VOL connector with that
+ *              value has not been registered.
+ *
+ *-------------------------------------------------------------------------
+ */
+hid_t
+H5VLget_connector_id_by_value(H5VL_class_value_t connector_value)
+{
+    hid_t ret_value = H5I_INVALID_HID;  /* Return value */
+
+    FUNC_ENTER_API(H5I_INVALID_HID)
+    H5TRACE1("i", "VC", connector_value);
+
+    /* Get connector ID with this value */
+    if((ret_value = H5VL__get_connector_id_by_value(connector_value, TRUE)) < 0)
+        HGOTO_ERROR(H5E_VOL, H5E_CANTGET, H5I_INVALID_HID, "can't get VOL id")
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* end H5VLget_connector_id_by_value() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VLpeek_connector_id_by_name
  *
  * Purpose:     Retrieves the ID for a registered VOL connector.
  *
@@ -328,7 +389,7 @@ done:
  *-------------------------------------------------------------------------
  */
 hid_t
-H5VLpeek_connector_id(const char *name)
+H5VLpeek_connector_id_by_name(const char *name)
 {
     hid_t ret_value = H5I_INVALID_HID;  /* Return value */
 
@@ -336,12 +397,44 @@ H5VLpeek_connector_id(const char *name)
     H5TRACE1("i", "*s", name);
 
     /* Get connector ID with this name */
-    if((ret_value = H5VL__peek_connector_id(name)) < 0)
+    if((ret_value = H5VL__peek_connector_id_by_name(name)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_CANTGET, H5I_INVALID_HID, "can't get VOL id")
 
 done:
     FUNC_LEAVE_API(ret_value)
-} /* end H5VLpeek_connector_id() */
+} /* end H5VLpeek_connector_id_by_name() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VLpeek_connector_id_by_value
+ *
+ * Purpose:     Retrieves the ID for a registered VOL connector.
+ *
+ * Return:      A valid VOL connector ID if a connector with that value
+ *              has been registered. This ID is *not* owned by the caller
+ *              and H5VLclose() should not be called.  Intended for use by
+ *              VOL connectors to find their own ID.
+ *
+ *              H5I_INVALID_HID on error or if a VOL connector with that
+ *              value has not been registered.
+ *
+ *-------------------------------------------------------------------------
+ */
+hid_t
+H5VLpeek_connector_id_by_value(H5VL_class_value_t value)
+{
+    hid_t ret_value = H5I_INVALID_HID;  /* Return value */
+
+    FUNC_ENTER_API(H5I_INVALID_HID)
+    H5TRACE1("i", "VC", value);
+
+    /* Get connector ID with this value */
+    if((ret_value = H5VL__peek_connector_id_by_value(value)) < 0)
+        HGOTO_ERROR(H5E_VOL, H5E_CANTGET, H5I_INVALID_HID, "can't get VOL id")
+
+done:
+    FUNC_LEAVE_API(ret_value)
+} /* end H5VLpeek_connector_id_by_value() */
 
 
 /*-------------------------------------------------------------------------
diff --git a/src/H5VLconnector.h b/src/H5VLconnector.h
index 9bc3a7bef8..baa4ccaf3c 100644
--- a/src/H5VLconnector.h
+++ b/src/H5VLconnector.h
@@ -512,7 +512,8 @@ H5_DLL hid_t H5VLregister_connector(const H5VL_class_t *cls, hid_t vipl_id);
 H5_DLL void *H5VLobject(hid_t obj_id);
 H5_DLL hid_t H5VLget_file_type(void *file_obj, hid_t connector_id,
     hid_t dtype_id);
-H5_DLL hid_t H5VLpeek_connector_id(const char *name);
+H5_DLL hid_t H5VLpeek_connector_id_by_name(const char *name);
+H5_DLL hid_t H5VLpeek_connector_id_by_value(H5VL_class_value_t value);
 
 #ifdef __cplusplus
 }
diff --git a/src/H5VLint.c b/src/H5VLint.c
index 9038d3868d..39b0f53a14 100644
--- a/src/H5VLint.c
+++ b/src/H5VLint.c
@@ -421,7 +421,7 @@ H5VL__set_def_conn(void)
             HGOTO_ERROR(H5E_VOL, H5E_BADVALUE, FAIL, "VOL connector environment variable set empty?")
 
         /* First, check to see if the connector is already registered */
-        if((connector_is_registered = H5VL__is_connector_registered(tok)) < 0)
+        if((connector_is_registered = H5VL__is_connector_registered_by_name(tok)) < 0)
             HGOTO_ERROR(H5E_VOL, H5E_CANTGET, FAIL, "can't check if VOL connector already registered")
         else if(connector_is_registered) {
             /* Retrieve the ID of the already-registered VOL connector */
@@ -1325,7 +1325,7 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5VL__is_connector_registered
+ * Function:    H5VL__is_connector_registered_by_name
  *
  * Purpose:     Checks if a connector with a particular name is registered.
  *
@@ -1338,7 +1338,7 @@ done:
  *-------------------------------------------------------------------------
  */
 htri_t
-H5VL__is_connector_registered(const char *name)
+H5VL__is_connector_registered_by_name(const char *name)
 {
     H5VL_get_connector_ud_t op_data;    /* Callback info for connector search */
     htri_t ret_value = FALSE;           /* Return value */
@@ -1360,7 +1360,44 @@ H5VL__is_connector_registered(const char *name)
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__is_connector_registered() */
+} /* end H5VL__is_connector_registered_by_name() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__is_connector_registered_by_value
+ *
+ * Purpose:     Checks if a connector with a particular value (ID) is
+ *              registered.
+ *
+ * Return:      Success:    0
+ *              Failure:    -1
+ *
+ *-------------------------------------------------------------------------
+ */
+htri_t
+H5VL__is_connector_registered_by_value(H5VL_class_value_t value)
+{
+    H5VL_get_connector_ud_t op_data;    /* Callback info for connector search */
+    htri_t ret_value = FALSE;           /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* Set up op data for iteration */
+    op_data.kind = H5VL_GET_CONNECTOR_BY_VALUE;
+    op_data.u.value = value;
+    op_data.found_id = H5I_INVALID_HID;
+
+    /* Find connector with value */
+    if(H5I_iterate(H5I_VOL, H5VL__get_connector_cb, &op_data, TRUE) < 0)
+        HGOTO_ERROR(H5E_VOL, H5E_BADITER, FAIL, "can't iterate over VOL connectors")
+
+    /* Found a connector with that name */
+    if(op_data.found_id != H5I_INVALID_HID)
+        ret_value = TRUE;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__is_connector_registered_by_value() */
 
 
 /*-------------------------------------------------------------------------
@@ -1419,7 +1456,7 @@ H5VL__get_connector_id_by_name(const char *name, hbool_t is_api)
     FUNC_ENTER_PACKAGE
 
     /* Find connector with name */
-    if((ret_value = H5VL__peek_connector_id(name)) < 0)
+    if((ret_value = H5VL__peek_connector_id_by_name(name)) < 0)
         HGOTO_ERROR(H5E_VOL, H5E_BADITER, H5I_INVALID_HID, "can't find VOL connector")
 
     /* Found a connector with that name */
@@ -1432,18 +1469,50 @@ done:
 
 
 /*-------------------------------------------------------------------------
- * Function:    H5VL__peek_connector_id
+ * Function:    H5VL__get_connector_id_by_value
+ *
+ * Purpose:     Retrieves the ID for a registered VOL connector.
+ *
+ * Return:      Positive if the VOL class has been registered
+ *              Negative on error (if the class is not a valid class or
+ *                not registered)
+ *
+ *-------------------------------------------------------------------------
+ */
+hid_t
+H5VL__get_connector_id_by_value(H5VL_class_value_t value, hbool_t is_api)
+{
+    hid_t ret_value = H5I_INVALID_HID;      /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* Find connector with value */
+    if((ret_value = H5VL__peek_connector_id_by_value(value)) < 0)
+        HGOTO_ERROR(H5E_VOL, H5E_BADITER, H5I_INVALID_HID, "can't find VOL connector")
+
+    /* Found a connector with that value */
+    if(H5I_inc_ref(ret_value, is_api) < 0)
+        HGOTO_ERROR(H5E_FILE, H5E_CANTINC, H5I_INVALID_HID, "unable to increment ref count on VOL connector")
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__get_connector_id_by_value() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__peek_connector_id_by_name
  *
  * Purpose:     Retrieves the ID for a registered VOL connector.  Does not
  *              increment the ref count
  *
  * Return:      Positive if the VOL class has been registered
- *              Negative on error (if the class is not a valid class or not registered)
+ *              Negative on error (if the class is not a valid class or
+ *                not registered)
  *
  *-------------------------------------------------------------------------
  */
 hid_t
-H5VL__peek_connector_id(const char *name)
+H5VL__peek_connector_id_by_name(const char *name)
 {
     H5VL_get_connector_ud_t op_data;        /* Callback info for connector search */
     hid_t ret_value = H5I_INVALID_HID;      /* Return value */
@@ -1464,7 +1533,44 @@ H5VL__peek_connector_id(const char *name)
 
 done:
     FUNC_LEAVE_NOAPI(ret_value)
-} /* end H5VL__peek_connector_id() */
+} /* end H5VL__peek_connector_id_by_name() */
+
+
+/*-------------------------------------------------------------------------
+ * Function:    H5VL__peek_connector_id_by_value
+ *
+ * Purpose:     Retrieves the ID for a registered VOL connector.  Does not
+ *              increment the ref count
+ *
+ * Return:      Positive if the VOL class has been registered
+ *              Negative on error (if the class is not a valid class or
+ *                not registered)
+ *
+ *-------------------------------------------------------------------------
+ */
+hid_t
+H5VL__peek_connector_id_by_value(H5VL_class_value_t value)
+{
+    H5VL_get_connector_ud_t op_data;        /* Callback info for connector search */
+    hid_t ret_value = H5I_INVALID_HID;      /* Return value */
+
+    FUNC_ENTER_PACKAGE
+
+    /* Set up op data for iteration */
+    op_data.kind = H5VL_GET_CONNECTOR_BY_VALUE;
+    op_data.u.value = value;
+    op_data.found_id = H5I_INVALID_HID;
+
+    /* Find connector with value */
+    if(H5I_iterate(H5I_VOL, H5VL__get_connector_cb, &op_data, TRUE) < 0)
+        HGOTO_ERROR(H5E_VOL, H5E_BADITER, H5I_INVALID_HID, "can't iterate over VOL connectors")
+
+    /* Set return value */
+    ret_value = op_data.found_id;
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+} /* end H5VL__peek_connector_id_by_value() */
 
 
 /*-------------------------------------------------------------------------
diff --git a/src/H5VLpkg.h b/src/H5VLpkg.h
index 5965adc557..417473210b 100644
--- a/src/H5VLpkg.h
+++ b/src/H5VLpkg.h
@@ -53,10 +53,13 @@ H5_DLL hid_t H5VL__register_connector_by_name(const char *name, hbool_t app_ref,
     hid_t vipl_id);
 H5_DLL hid_t H5VL__register_connector_by_value(H5VL_class_value_t value,
     hbool_t app_ref, hid_t vipl_id);
-H5_DLL htri_t H5VL__is_connector_registered(const char *name);
+H5_DLL htri_t H5VL__is_connector_registered_by_name(const char *name);
+H5_DLL htri_t H5VL__is_connector_registered_by_value(H5VL_class_value_t value);
 H5_DLL hid_t H5VL__get_connector_id(hid_t obj_id, hbool_t is_api);
 H5_DLL hid_t H5VL__get_connector_id_by_name(const char *name, hbool_t is_api);
-H5_DLL hid_t H5VL__peek_connector_id(const char *name);
+H5_DLL hid_t H5VL__get_connector_id_by_value(H5VL_class_value_t value, hbool_t is_api);
+H5_DLL hid_t H5VL__peek_connector_id_by_name(const char *name);
+H5_DLL hid_t H5VL__peek_connector_id_by_value(H5VL_class_value_t value);
 H5_DLL herr_t H5VL__connector_str_to_info(const char *str, hid_t connector_id,
     void **info);
 H5_DLL ssize_t H5VL__get_connector_name(hid_t id, char *name/*out*/, size_t size);
diff --git a/src/H5VLpublic.h b/src/H5VLpublic.h
index 883aac818d..006c3eafa4 100644
--- a/src/H5VLpublic.h
+++ b/src/H5VLpublic.h
@@ -42,7 +42,7 @@
 /*
  * VOL connector identifiers.  Values 0 through 255 are for connectors defined
  * by the HDF5 library.  Values 256 through 511 are available for testing new
- * filters.  Subsequent values should be obtained from the HDF5 development
+ * connectors. Subsequent values should be obtained from the HDF5 development
  * team at help@hdfgroup.org.
  */
 typedef int H5VL_class_value_t;
@@ -60,14 +60,13 @@ typedef int H5VL_class_value_t;
 extern "C" {
 #endif
 
-/* The H5VL types uses in the API calls are not opaque - they are defined in
- * H5VLconnector.h, which is included at the top of this file.
- */
 H5_DLL hid_t H5VLregister_connector_by_name(const char *connector_name, hid_t vipl_id);
 H5_DLL hid_t H5VLregister_connector_by_value(H5VL_class_value_t connector_value, hid_t vipl_id);
-H5_DLL htri_t H5VLis_connector_registered(const char *name);
+H5_DLL htri_t H5VLis_connector_registered_by_name(const char *name);
+H5_DLL htri_t H5VLis_connector_registered_by_value(H5VL_class_value_t connector_value);
 H5_DLL hid_t H5VLget_connector_id(hid_t obj_id);
 H5_DLL hid_t H5VLget_connector_id_by_name(const char *name);
+H5_DLL hid_t H5VLget_connector_id_by_value(H5VL_class_value_t connector_value);
 H5_DLL ssize_t H5VLget_connector_name(hid_t id, char *name/*out*/, size_t size);
 H5_DLL herr_t H5VLclose(hid_t connector_id);
 H5_DLL herr_t H5VLunregister_connector(hid_t connector_id);
diff --git a/test/vol.c b/test/vol.c
index d26499ea7b..88354e19d9 100644
--- a/test/vol.c
+++ b/test/vol.c
@@ -38,13 +38,14 @@ const char *FILENAME[] = {
 #define N_ELEMENTS  10
 
 #define FAKE_VOL_NAME   "fake"
+#define FAKE_VOL_VALUE ((H5VL_class_value_t)501)
 
 /* A VOL class struct that describes a VOL class with no
  * functionality.
  */
 static const H5VL_class_t fake_vol_g = {
     0,                                              /* version      */
-    (H5VL_class_value_t)501,                        /* value        */
+    FAKE_VOL_VALUE,                                 /* value        */
     FAKE_VOL_NAME,                                  /* name         */
     0,                                              /* capability flags */
     NULL,                                           /* initialize   */
@@ -174,7 +175,11 @@ test_vol_registration(void)
     TESTING("VOL registration");
 
     /* The test/fake VOL connector should not be registered at the start of the test */
-    if ((is_registered = H5VLis_connector_registered(FAKE_VOL_NAME)) < 0)
+    if ((is_registered = H5VLis_connector_registered_by_name(FAKE_VOL_NAME)) < 0)
+        TEST_ERROR;
+    if (is_registered > 0)
+        FAIL_PUTS_ERROR("VOL connector is inappropriately registered");
+    if ((is_registered = H5VLis_connector_registered_by_value(FAKE_VOL_VALUE)) < 0)
         TEST_ERROR;
     if (is_registered > 0)
         FAIL_PUTS_ERROR("VOL connector is inappropriately registered");
@@ -203,7 +208,11 @@ test_vol_registration(void)
         TEST_ERROR;
 
     /* The test/fake VOL connector should be registered now */
-    if ((is_registered = H5VLis_connector_registered(FAKE_VOL_NAME)) < 0)
+    if ((is_registered = H5VLis_connector_registered_by_name(FAKE_VOL_NAME)) < 0)
+        TEST_ERROR;
+    if (0 == is_registered)
+        FAIL_PUTS_ERROR("VOL connector is un-registered");
+    if ((is_registered = H5VLis_connector_registered_by_value(FAKE_VOL_VALUE)) < 0)
         TEST_ERROR;
     if (0 == is_registered)
         FAIL_PUTS_ERROR("VOL connector is un-registered");
@@ -213,7 +222,11 @@ test_vol_registration(void)
         TEST_ERROR;
 
     /* The test/fake VOL connector should still be registered now */
-    if ((is_registered = H5VLis_connector_registered(FAKE_VOL_NAME)) < 0)
+    if ((is_registered = H5VLis_connector_registered_by_name(FAKE_VOL_NAME)) < 0)
+        TEST_ERROR;
+    if (0 == is_registered)
+        FAIL_PUTS_ERROR("VOL connector is un-registered");
+    if ((is_registered = H5VLis_connector_registered_by_value(FAKE_VOL_VALUE)) < 0)
         TEST_ERROR;
     if (0 == is_registered)
         FAIL_PUTS_ERROR("VOL connector is un-registered");
@@ -223,7 +236,11 @@ test_vol_registration(void)
         TEST_ERROR;
 
     /* The test/fake VOL connector should still be registered now */
-    if ((is_registered = H5VLis_connector_registered(FAKE_VOL_NAME)) < 0)
+    if ((is_registered = H5VLis_connector_registered_by_name(FAKE_VOL_NAME)) < 0)
+        TEST_ERROR;
+    if (0 == is_registered)
+        FAIL_PUTS_ERROR("VOL connector is un-registered");
+    if ((is_registered = H5VLis_connector_registered_by_value(FAKE_VOL_VALUE)) < 0)
         TEST_ERROR;
     if (0 == is_registered)
         FAIL_PUTS_ERROR("VOL connector is un-registered");
@@ -272,7 +289,12 @@ test_native_vol_init(void)
     TESTING("Native VOL connector initialization");
 
     /* The native VOL connector should always be registered */
-    if ((is_registered = H5VLis_connector_registered(H5VL_NATIVE_NAME)) < 0)
+    if ((is_registered = H5VLis_connector_registered_by_name(H5VL_NATIVE_NAME)) < 0)
+        TEST_ERROR;
+    if (0 == is_registered)
+        FAIL_PUTS_ERROR("native VOL connector is un-registered");
+
+    if ((is_registered = H5VLis_connector_registered_by_value(H5VL_NATIVE_VALUE)) < 0)
         TEST_ERROR;
     if (0 == is_registered)
         FAIL_PUTS_ERROR("native VOL connector is un-registered");
diff --git a/test/vol_plugin.c b/test/vol_plugin.c
index e4f171ba13..565c847587 100644
--- a/test/vol_plugin.c
+++ b/test/vol_plugin.c
@@ -43,7 +43,7 @@ test_registration_by_value(void)
     TESTING("VOL registration by value");
 
     /* The null VOL connector should not be registered at the start of the test */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_value(NULL_VOL_CONNECTOR_VALUE)) < 0)
         TEST_ERROR;
     if(TRUE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
@@ -53,7 +53,7 @@ test_registration_by_value(void)
         TEST_ERROR;
 
     /* The connector should be registered now */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_value(NULL_VOL_CONNECTOR_VALUE)) < 0)
         TEST_ERROR;
     if(FALSE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector was not registered");
@@ -63,7 +63,7 @@ test_registration_by_value(void)
         TEST_ERROR;
 
     /* The connector should not be registered now */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_value(NULL_VOL_CONNECTOR_VALUE)) < 0)
         TEST_ERROR;
     if(TRUE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
@@ -99,7 +99,7 @@ test_registration_by_name(void)
     TESTING("VOL registration by name");
 
     /* The null VOL connector should not be registered at the start of the test */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_name(NULL_VOL_CONNECTOR_NAME)) < 0)
         TEST_ERROR;
     if(TRUE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
@@ -109,7 +109,7 @@ test_registration_by_name(void)
         TEST_ERROR;
 
     /* The connector should be registered now */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_name(NULL_VOL_CONNECTOR_NAME)) < 0)
         TEST_ERROR;
     if(FALSE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector was not registered");
@@ -119,7 +119,7 @@ test_registration_by_name(void)
         TEST_ERROR;
 
     /* The connector should not be registered now */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_name(NULL_VOL_CONNECTOR_NAME)) < 0)
         TEST_ERROR;
     if(TRUE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
@@ -156,7 +156,7 @@ test_multiple_registration(void)
     TESTING("registering a VOL connector multiple times");
 
     /* The null VOL connector should not be registered at the start of the test */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_name(NULL_VOL_CONNECTOR_NAME)) < 0)
         TEST_ERROR;
     if(TRUE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
@@ -168,7 +168,7 @@ test_multiple_registration(void)
     }
 
     /* The connector should be registered now */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_name(NULL_VOL_CONNECTOR_NAME)) < 0)
         TEST_ERROR;
     if(FALSE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector was not registered");
@@ -186,7 +186,43 @@ test_multiple_registration(void)
     }
 
     /* The connector should not be registered now */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_name(NULL_VOL_CONNECTOR_NAME)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    /* Repeat testing with the _by_value routines */
+    if((is_registered = H5VLis_connector_registered_by_value(NULL_VOL_CONNECTOR_VALUE)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    /* Register the connector multiple times */
+    for(i = 0; i < N_REGISTRATIONS; i++) {
+        if((vol_ids[i] = H5VLregister_connector_by_value(NULL_VOL_CONNECTOR_VALUE, H5P_DEFAULT)) < 0)
+            TEST_ERROR;
+    }
+
+    /* The connector should be registered now */
+    if((is_registered = H5VLis_connector_registered_by_value(NULL_VOL_CONNECTOR_VALUE)) < 0)
+        TEST_ERROR;
+    if(FALSE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector was not registered");
+
+    /* Unregister the connector */
+    for(i = 0; i < N_REGISTRATIONS; i++) {
+        if(H5VLunregister_connector(vol_ids[i]) < 0)
+            TEST_ERROR;
+        /* Also test close on some of the IDs. This call currently works
+         * identically to unregister.
+         */
+        i++;
+        if(H5VLclose(vol_ids[i]) < 0)
+            TEST_ERROR;
+    }
+
+    /* The connector should not be registered now */
+    if((is_registered = H5VLis_connector_registered_by_value(NULL_VOL_CONNECTOR_VALUE)) < 0)
         TEST_ERROR;
     if(TRUE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
@@ -223,7 +259,7 @@ test_getters(void)
     TESTING("VOL getters");
 
     /* The null VOL connector should not be registered at the start of the test */
-    if((is_registered = H5VLis_connector_registered(NULL_VOL_CONNECTOR_NAME)) < 0)
+    if((is_registered = H5VLis_connector_registered_by_name(NULL_VOL_CONNECTOR_NAME)) < 0)
         TEST_ERROR;
     if(TRUE == is_registered)
         FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
@@ -232,11 +268,35 @@ test_getters(void)
     if((vol_id = H5VLregister_connector_by_name(NULL_VOL_CONNECTOR_NAME, H5P_DEFAULT)) < 0)
         TEST_ERROR;
 
-    /* Get the connector's ID */
+    /* Get the connector's ID by name */
     if((vol_id_out = H5VLget_connector_id_by_name(NULL_VOL_CONNECTOR_NAME)) < 0)
         TEST_ERROR;
     if(vol_id != vol_id_out)
         FAIL_PUTS_ERROR("VOL connector IDs don't match");
+    if(H5VLclose(vol_id_out) < 0)
+        TEST_ERROR;
+
+    /* Unregister the connector */
+    if(H5VLunregister_connector(vol_id) < 0)
+        TEST_ERROR;
+
+    /* Repeat testing with the _by_value routines */
+    if((is_registered = H5VLis_connector_registered_by_value(NULL_VOL_CONNECTOR_VALUE)) < 0)
+        TEST_ERROR;
+    if(TRUE == is_registered)
+        FAIL_PUTS_ERROR("NULL VOL connector is inappropriately registered");
+
+    /* Register the connector by value */
+    if((vol_id = H5VLregister_connector_by_value(NULL_VOL_CONNECTOR_VALUE, H5P_DEFAULT)) < 0)
+        TEST_ERROR;
+
+    /* Get the connector's ID by value */
+    if((vol_id_out = H5VLget_connector_id_by_value(NULL_VOL_CONNECTOR_VALUE)) < 0)
+        TEST_ERROR;
+    if(vol_id != vol_id_out)
+        FAIL_PUTS_ERROR("VOL connector IDs don't match");
+    if(H5VLclose(vol_id_out) < 0)
+        TEST_ERROR;
 
     /* Unregister the connector */
     if(H5VLunregister_connector(vol_id) < 0)
@@ -247,6 +307,7 @@ test_getters(void)
 
 error:
     H5E_BEGIN_TRY {
+        H5VLclose(vol_id_out);
         H5VLunregister_connector(vol_id);
     } H5E_END_TRY;
     return FAIL;
diff --git a/tools/lib/h5tools.c b/tools/lib/h5tools.c
index 47f6e3ff19..33f1e11303 100644
--- a/tools/lib/h5tools.c
+++ b/tools/lib/h5tools.c
@@ -12,8 +12,8 @@
  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 /*
- * Purpose: A library for displaying the values of a dataset in a human
- *  readable format.
+ * Purpose: A library for routines that are common
+ *          amongst the various HDF5 tools.
  */
 
 #include "h5tools.h"
diff --git a/tools/lib/h5tools_utils.h b/tools/lib/h5tools_utils.h
index 366800a1f5..598930c12f 100644
--- a/tools/lib/h5tools_utils.h
+++ b/tools/lib/h5tools_utils.h
@@ -129,7 +129,7 @@ H5TOOLS_DLL void warn_msg(const char *fmt, ...);
 H5TOOLS_DLL void help_ref_msg(FILE *output);
 H5TOOLS_DLL void free_table(table_t *table);
 #ifdef H5DUMP_DEBUG
-H5TOOLS_DLL void dump_tables(find_objs_t *info)
+H5TOOLS_DLL void dump_tables(find_objs_t *info);
 #endif  /* H5DUMP_DEBUG */
 H5TOOLS_DLL herr_t init_objs(hid_t fid, find_objs_t *info, table_t **group_table, table_t **dset_table, table_t **type_table);
 H5TOOLS_DLL obj_t *search_obj(table_t *temp, const H5O_token_t *obj_token);