diff --git a/CHANGELOG b/CHANGELOG
index 5da24c95..3ddf9511 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -5,6 +5,8 @@ HISTORY
   * [Enter new changes just after this line - do not remove this line]
 
   ++ New features:
+  2017-11-20: Joel Cunningham
+  * netconn: add LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE to use external DNS resolver (patch #9427)
 
   2017-11-14: Joel Cunningham
   * netifapi: Add thread safe ARP cache APIs (task #14724)
diff --git a/src/api/api_lib.c b/src/api/api_lib.c
index 9c7b249f..2541f41e 100644
--- a/src/api/api_lib.c
+++ b/src/api/api_lib.c
@@ -69,6 +69,10 @@
 #include "lwip/priv/tcp_priv.h"
 #include "lwip/priv/tcpip_priv.h"
 
+#ifdef LWIP_HOOK_FILENAME
+#include LWIP_HOOK_FILENAME
+#endif
+
 #include <string.h>
 
 #define API_MSG_VAR_REF(name)               API_VAR_REF(name)
@@ -1209,6 +1213,16 @@ netconn_gethostbyname(const char *name, ip_addr_t *addr)
   }
 #endif
 
+#ifdef LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE
+#if LWIP_IPV4 && LWIP_IPV6
+  if (LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE(name, addr, dns_addrtype, &err)) {
+#else
+  if (LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE(name, addr, NETCONN_DNS_DEFAULT, &err)) {
+#endif /* LWIP_IPV4 && LWIP_IPV6 */
+    return err;
+  }
+#endif /* LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE */
+
   API_VAR_ALLOC(struct dns_api_msg, MEMP_DNS_API_MSG, msg, ERR_MEM);
 #if LWIP_MPU_COMPATIBLE
   strncpy(API_VAR_REF(msg).name, name, DNS_MAX_NAME_LENGTH - 1);
diff --git a/src/include/lwip/opt.h b/src/include/lwip/opt.h
index 2b5a765b..54bc01e4 100644
--- a/src/include/lwip/opt.h
+++ b/src/include/lwip/opt.h
@@ -2911,6 +2911,28 @@
 #ifdef __DOXYGEN__
 #define LWIP_HOOK_DHCP_PARSE_OPTION(netif, dhcp, state, msg, msg_type, option, len, pbuf, offset)
 #endif
+
+/**
+ * LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE(name, addr, addrtype, err)
+ * Called from netconn APIs (not usable with callback apps) allowing an
+ * external DNS resolver (which uses sequential API) to handle the query.
+ * Signature:
+ *   int my_hook(const char *name, ip_addr_t *addr, u8_t addrtype, err_t *err)
+ * Arguments:
+ * - name: hostname to resolve
+ * - addr: output host address
+ * - addrtype: type of address to query
+ * - err: output error
+ * Return values:
+ * - 0: Hook has not consumed hostname query, query continues into DNS module
+ * - != 0: Hook has consumed the query
+ *
+ * err must also be checked to determine if the hook consumed the query, but
+ * the query failed
+ */
+#ifdef __DOXYGEN__
+#define LWIP_HOOK_NETCONN_EXTERNAL_RESOLVE(name, addr, addrtype, err)
+#endif
 /**
  * @}
  */