diff --git a/interface.c b/interface.c
index d7eeb41..02f63a0 100644
--- a/interface.c
+++ b/interface.c
@@ -28,6 +28,11 @@ const char *interface_name(struct interface *iface)
 	return iface->name;
 }
 
+int interface_phc_index(struct interface *iface)
+{
+	return iface->ts_info.phc_index;
+}
+
 void interface_set_label(struct interface *iface, const char *label)
 {
 	strncpy(iface->ts_label, label, MAX_IFNAME_SIZE);
diff --git a/interface.h b/interface.h
index f416b24..4f408d5 100644
--- a/interface.h
+++ b/interface.h
@@ -53,6 +53,13 @@ const char *interface_label(struct interface *iface);
  */
 const char *interface_name(struct interface *iface);
 
+/**
+ * Obtains the index of a PTP Hardware Clock device from a network interface.
+ * @param iface  The interface of interest.
+ * @return       The PHC index of the interface.
+ */
+int interface_phc_index(struct interface *iface);
+
 /**
  * Set the time stamping label of a given interface.
  * @param iface  The interface of interest.