diff --git a/sys/netgraph/ng_socket.c b/sys/netgraph/ng_socket.c
--- a/sys/netgraph/ng_socket.c
+++ b/sys/netgraph/ng_socket.c
@@ -523,6 +523,9 @@
 		if (NG_NODE_HAS_NAME(node))
 			bcopy(NG_NODE_NAME(node), sg->sg_data,
 			    strlen(NG_NODE_NAME(node)));
+		else
+			snprintf(sg->sg_data, sizeof(sg->sg_data), "[%x]",
+			    ng_node2ID(node));
 		mtx_unlock(&pcbp->sockdata->mtx);
 
 		sg->sg_len = sg_len;
diff --git a/tests/sys/netgraph/socket.c b/tests/sys/netgraph/socket.c
--- a/tests/sys/netgraph/socket.c
+++ b/tests/sys/netgraph/socket.c
@@ -42,13 +42,12 @@
 	char name[NG_NODESIZ] = NAME;
 	int cs;
 
-#if 0
-	/* Unnamed node. */
+	/* Unnamed node returns its ID as name. */
 	ATF_REQUIRE(NgMkSockNode(NULL, &cs, NULL) == 0);
 	ATF_REQUIRE(getsockname(cs, (struct sockaddr *)&sg, &len) == 0);
+	ATF_REQUIRE(strspn(sg.sg_data, "[0123456789abcdef]") >= 3 &&
+	    sg.sg_data[strspn(sg.sg_data, "[0123456789abcdef]")] == '\0');
 	close(cs);
-	/* Unnamed node doesn't return any name/ID now. */
-#endif
 
 	/* Named node. */
 	ATF_REQUIRE(NgMkSockNode(name, &cs, NULL) == 0);