diff --git a/include/nuttx/net/ip.h b/include/nuttx/net/ip.h
index 2082e590df..3bb221f101 100644
--- a/include/nuttx/net/ip.h
+++ b/include/nuttx/net/ip.h
@@ -327,6 +327,47 @@ EXTERN const net_ipv6addr_t g_ipv6_llnetmask;   /* Netmask for local link addres
     ((uint16_t*)(addr))[7] = HTONS((addr7)); \
   } while (0)
 
+/****************************************************************************
+ * Macro: ip6_get_ipv4addr
+ *
+ * Description:
+ *   Decode an encoded IPv4 address.
+ *
+ * Input Parameters:
+ *   ipv6addr - The IPv6 address (net_ipv6addr_t) containing the encoded
+ *     IPv4 address
+ *
+ * Returned Value:
+ *   The decode IPv4 addreses (in_addr_t)
+ *
+ ****************************************************************************/
+
+#define ip6_get_ipv4addr(ipv6addr) \
+  (((in_addr_t)(ipv6addr)->s6_addr[12]) | \
+   ((in_addr_t)(ipv6addr)->s6_addr[13] << 8) | \
+   ((in_addr_t)(ipv6addr)->s6_addr[14] << 16) | \
+   ((in_addr_t)(ipv6addr)->s6_addr[15] << 24))
+
+/****************************************************************************
+ * Macro: ip6_is_ipv4addr
+ *
+ * Description:
+ *   Test if an IPv6 is an encoded IPv4 address.
+ *
+ * Input Parameters:
+ *   ipv6addr - The IPv6 address to be tested
+ *
+ * Returned Value:
+ *   True is returned if ipv6addr holds an encoded IPv4 address.
+ *
+ ****************************************************************************/
+
+#define ip6_is_ipv4addr(ipv6addr) \
+  ((ipv6addr)->s6_addr32[0] == 0 && \
+   (ipv6addr)->s6_addr32[1] == 0 && \
+   (ipv6addr)->s6_addr16[4] == 0 && \
+   (ipv6addr)->s6_addr16[5] == 0xffff)
+
 /****************************************************************************
  * Macro: net_ipv4addr_copy, net_ipv4addr_hdrcopy, net_ipv6addr_copy, and
  *        net_ipv6addr_hdrcopy
diff --git a/net/udp/udp_send.c b/net/udp/udp_send.c
index 7ddff14167..e18be4d246 100644
--- a/net/udp/udp_send.c
+++ b/net/udp/udp_send.c
@@ -73,18 +73,6 @@
 #define UDPIPv6BUF \
   ((struct udp_hdr_s *)&dev->d_buf[NET_LL_HDRLEN(dev) + IPv6_HDRLEN])
 
-#define IN6_IS_ADDR_IPV4(a) \
-  ((a)->s6_addr32[0] == 0 && \
-   (a)->s6_addr32[1] == 0 && \
-   (a)->s6_addr16[4] == 0 && \
-   (a)->s6_addr16[5] == 0xffff)
-
-#define IN6_GET_ADDR_IPV4(a) \
-  (((in_addr_t)(a)->s6_addr[12]) | \
-   ((in_addr_t)(a)->s6_addr[13] << 8) | \
-   ((in_addr_t)(a)->s6_addr[14] << 16) | \
-   ((in_addr_t)(a)->s6_addr[15] << 24))
-
 /****************************************************************************
  * Public Variables
  ****************************************************************************/
@@ -133,7 +121,7 @@ void udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn)
 #ifdef CONFIG_NET_IPv6
       if (conn->domain == PF_INET ||
           (conn->domain == PF_INET6 &&
-           IN6_IS_ADDR_IPV4((FAR struct in6_addr*)conn->u.ipv6.raddr)))
+           ip6_is_ipv4addr((FAR struct in6_addr*)conn->u.ipv6.raddr)))
 #endif
         {
           /* Get pointers to the IPv4 header and the offset TCP header */
@@ -159,9 +147,9 @@ void udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn)
 
 #ifdef CONFIG_NET_IPv6
           if (conn->domain == PF_INET6 &&
-              IN6_IS_ADDR_IPV4((FAR struct in6_addr*)conn->u.ipv6.raddr))
+              ip6_is_ipv4addr((FAR struct in6_addr*)conn->u.ipv6.raddr))
             {
-              in_addr_t raddr = IN6_GET_ADDR_IPV4((FAR struct in6_addr*)conn->u.ipv6.raddr);
+              in_addr_t raddr = ip6_get_ipv4addr((FAR struct in6_addr*)conn->u.ipv6.raddr);
               net_ipv4addr_hdrcopy(ipv4->destipaddr, &raddr);
             }
           else
@@ -253,7 +241,7 @@ void udp_send(FAR struct net_driver_s *dev, FAR struct udp_conn_s *conn)
 #ifdef CONFIG_NET_IPv6
       if (conn->domain == PF_INET ||
           (conn->domain == PF_INET6 &&
-           IN6_IS_ADDR_IPV4((FAR struct in6_addr*)conn->u.ipv6.raddr)))
+           ip6_is_ipv4addr((FAR struct in6_addr*)conn->u.ipv6.raddr)))
 #endif
         {
           udp->udpchksum = ~udp_ipv4_chksum(dev);