diff --git a/ospf6d/ospf6_message.c b/ospf6d/ospf6_message.c
index 349dc50b8c..6f6e2e1589 100644
--- a/ospf6d/ospf6_message.c
+++ b/ospf6d/ospf6_message.c
@@ -86,13 +86,9 @@ const uint16_t ospf6_lsa_minlen[OSPF6_LSTYPE_SIZE] = {
 
 static void ospf6_header_print(struct ospf6_header *oh)
 {
-	char router_id[16], area_id[16];
-	inet_ntop(AF_INET, &oh->router_id, router_id, sizeof(router_id));
-	inet_ntop(AF_INET, &oh->area_id, area_id, sizeof(area_id));
-
-	zlog_debug("    OSPFv%d Type:%d Len:%hu Router-ID:%s", oh->version,
-		   oh->type, ntohs(oh->length), router_id);
-	zlog_debug("    Area-ID:%s Cksum:%hx Instance-ID:%d", area_id,
+	zlog_debug("    OSPFv%d Type:%d Len:%hu Router-ID:%pI4", oh->version,
+		   oh->type, ntohs(oh->length), &oh->router_id);
+	zlog_debug("    Area-ID:%pI4 Cksum:%hx Instance-ID:%d", &oh->area_id,
 		   ntohs(oh->checksum), oh->instance_id);
 }
 
@@ -100,7 +96,6 @@ void ospf6_hello_print(struct ospf6_header *oh)
 {
 	struct ospf6_hello *hello;
 	char options[16];
-	char drouter[16], bdrouter[16], neighbor[16];
 	char *p;
 
 	ospf6_header_print(oh);
@@ -109,8 +104,6 @@ void ospf6_hello_print(struct ospf6_header *oh)
 	hello = (struct ospf6_hello *)((caddr_t)oh
 				       + sizeof(struct ospf6_header));
 
-	inet_ntop(AF_INET, &hello->drouter, drouter, sizeof(drouter));
-	inet_ntop(AF_INET, &hello->bdrouter, bdrouter, sizeof(bdrouter));
 	ospf6_options_printbuf(hello->options, options, sizeof(options));
 
 	zlog_debug("    I/F-Id:%ld Priority:%d Option:%s",
@@ -118,14 +111,12 @@ void ospf6_hello_print(struct ospf6_header *oh)
 		   options);
 	zlog_debug("    HelloInterval:%hu DeadInterval:%hu",
 		   ntohs(hello->hello_interval), ntohs(hello->dead_interval));
-	zlog_debug("    DR:%s BDR:%s", drouter, bdrouter);
+	zlog_debug("    DR:%pI4 BDR:%pI4", &hello->drouter, &hello->bdrouter);
 
 	for (p = (char *)((caddr_t)hello + sizeof(struct ospf6_hello));
 	     p + sizeof(uint32_t) <= OSPF6_MESSAGE_END(oh);
-	     p += sizeof(uint32_t)) {
-		inet_ntop(AF_INET, (void *)p, neighbor, sizeof(neighbor));
-		zlog_debug("    Neighbor: %s", neighbor);
-	}
+	     p += sizeof(uint32_t))
+		zlog_debug("    Neighbor: %pI4", p);
 
 	assert(p == OSPF6_MESSAGE_END(oh));
 }
@@ -162,7 +153,6 @@ void ospf6_dbdesc_print(struct ospf6_header *oh)
 
 void ospf6_lsreq_print(struct ospf6_header *oh)
 {
-	char id[16], adv_router[16];
 	char *p;
 
 	ospf6_header_print(oh);
@@ -172,11 +162,9 @@ void ospf6_lsreq_print(struct ospf6_header *oh)
 	     p + sizeof(struct ospf6_lsreq_entry) <= OSPF6_MESSAGE_END(oh);
 	     p += sizeof(struct ospf6_lsreq_entry)) {
 		struct ospf6_lsreq_entry *e = (struct ospf6_lsreq_entry *)p;
-		inet_ntop(AF_INET, &e->adv_router, adv_router,
-			  sizeof(adv_router));
-		inet_ntop(AF_INET, &e->id, id, sizeof(id));
-		zlog_debug("    [%s Id:%s Adv:%s]", ospf6_lstype_name(e->type),
-			   id, adv_router);
+
+		zlog_debug("    [%s Id:%pI4 Adv:%pI4]",
+			   ospf6_lstype_name(e->type), &e->id, &e->adv_router);
 	}
 
 	assert(p == OSPF6_MESSAGE_END(oh));
@@ -856,15 +844,11 @@ static void ospf6_lsreq_recv(struct in6_addr *src, struct in6_addr *dst,
 		/* Find database copy */
 		lsa = ospf6_lsdb_lookup(e->type, e->id, e->adv_router, lsdb);
 		if (lsa == NULL) {
-			char id[16], adv_router[16];
 			if (IS_OSPF6_DEBUG_MESSAGE(oh->type, RECV)) {
-				inet_ntop(AF_INET, &e->id, id, sizeof(id));
-				inet_ntop(AF_INET, &e->adv_router, adv_router,
-					  sizeof(adv_router));
 				zlog_debug(
-					"Can't find requested [%s Id:%s Adv:%s]",
-					ospf6_lstype_name(e->type), id,
-					adv_router);
+					"Can't find requested [%s Id:%pI4 Adv:%pI4]",
+					ospf6_lstype_name(e->type), &e->id,
+					&e->adv_router);
 			}
 			thread_add_event(master, bad_lsreq, on, 0, NULL);
 			return;
@@ -1321,7 +1305,6 @@ static int ospf6_rxpacket_examin(struct ospf6_interface *oi,
 				 struct ospf6_header *oh,
 				 const unsigned bytesonwire)
 {
-	char buf[2][INET_ADDRSTRLEN];
 
 	if (MSG_OK != ospf6_packet_examin(oh, bytesonwire))
 		return MSG_NG;
@@ -1335,13 +1318,10 @@ static int ospf6_rxpacket_examin(struct ospf6_interface *oi,
 				oi->interface->name);
 		else
 			zlog_warn(
-				"VRF %s: I/F %s Area-ID mismatch (my %s, rcvd %s)",
+				"VRF %s: I/F %s Area-ID mismatch (my %pI4, rcvd %pI4)",
 				vrf_id_to_name(oi->interface->vrf_id),
-				oi->interface->name,
-				inet_ntop(AF_INET, &oi->area->area_id, buf[0],
-					  INET_ADDRSTRLEN),
-				inet_ntop(AF_INET, &oh->area_id, buf[1],
-					  INET_ADDRSTRLEN));
+				oi->interface->name, &oi->area->area_id,
+				&oh->area_id);
 		return MSG_NG;
 	}
 
@@ -1356,11 +1336,9 @@ static int ospf6_rxpacket_examin(struct ospf6_interface *oi,
 
 	/* Router-ID check */
 	if (oh->router_id == oi->area->ospf6->router_id) {
-		zlog_warn("VRF %s: I/F %s Duplicate Router-ID (%s)",
+		zlog_warn("VRF %s: I/F %s Duplicate Router-ID (%pI4)",
 			  vrf_id_to_name(oi->interface->vrf_id),
-			  oi->interface->name,
-			  inet_ntop(AF_INET, &oh->router_id, buf[0],
-				    INET_ADDRSTRLEN));
+			  oi->interface->name, &oh->router_id);
 		return MSG_NG;
 	}
 	return MSG_OK;
@@ -1541,7 +1519,6 @@ int ospf6_receive(struct thread *thread)
 {
 	int sockfd;
 	unsigned int len;
-	char srcname[64], dstname[64];
 	struct in6_addr src, dst;
 	ifindex_t ifindex;
 	struct iovec iovector[2];
@@ -1598,13 +1575,11 @@ int ospf6_receive(struct thread *thread)
 
 	/* Log */
 	if (IS_OSPF6_DEBUG_MESSAGE(oh->type, RECV)) {
-		inet_ntop(AF_INET6, &src, srcname, sizeof(srcname));
-		inet_ntop(AF_INET6, &dst, dstname, sizeof(dstname));
 		zlog_debug("%s received on %s",
 			   lookup_msg(ospf6_message_type_str, oh->type, NULL),
 			   oi->interface->name);
-		zlog_debug("    src: %s", srcname);
-		zlog_debug("    dst: %s", dstname);
+		zlog_debug("    src: %pI4", &src);
+		zlog_debug("    dst: %pI4", &dst);
 
 		switch (oh->type) {
 		case OSPF6_MESSAGE_TYPE_HELLO:
@@ -1659,7 +1634,7 @@ static void ospf6_send(struct in6_addr *src, struct in6_addr *dst,
 		       struct ospf6_interface *oi, struct ospf6_header *oh)
 {
 	unsigned int len;
-	char srcname[64], dstname[64];
+	char srcname[64];
 	struct iovec iovector[2];
 
 	/* initialize */
@@ -1680,7 +1655,6 @@ static void ospf6_send(struct in6_addr *src, struct in6_addr *dst,
 
 	/* Log */
 	if (IS_OSPF6_DEBUG_MESSAGE(oh->type, SEND)) {
-		inet_ntop(AF_INET6, dst, dstname, sizeof(dstname));
 		if (src)
 			inet_ntop(AF_INET6, src, srcname, sizeof(srcname));
 		else
@@ -1689,7 +1663,7 @@ static void ospf6_send(struct in6_addr *src, struct in6_addr *dst,
 			   lookup_msg(ospf6_message_type_str, oh->type, NULL),
 			   oi->interface->name);
 		zlog_debug("    src: %s", srcname);
-		zlog_debug("    dst: %s", dstname);
+		zlog_debug("    dst: %pI4", dst);
 
 		switch (oh->type) {
 		case OSPF6_MESSAGE_TYPE_HELLO:
diff --git a/ospf6d/ospf6_zebra.c b/ospf6d/ospf6_zebra.c
index 2b7072d34f..9b9453ce24 100644
--- a/ospf6d/ospf6_zebra.c
+++ b/ospf6d/ospf6_zebra.c
@@ -96,13 +96,9 @@ static int ospf6_router_id_update_zebra(ZAPI_CALLBACK_ARGS)
 		return 0;
 
 	o->router_id_zebra = router_id.u.prefix4;
-	if (IS_OSPF6_DEBUG_ZEBRA(RECV)) {
-		char buf[INET_ADDRSTRLEN];
-
-		zlog_debug("%s: zebra router-id %s update", __func__,
-			   inet_ntop(AF_INET, &router_id.u.prefix4, buf,
-				     INET_ADDRSTRLEN));
-	}
+	if (IS_OSPF6_DEBUG_ZEBRA(RECV))
+		zlog_debug("%s: zebra router-id %pI4 update", __func__,
+			   &router_id.u.prefix4);
 
 	ospf6_router_id_update(o);