diff --git a/util.c b/util.c
index 5b745a1..d3b352a 100644
--- a/util.c
+++ b/util.c
@@ -19,7 +19,7 @@
 // to use
 char *fmtaddr(in_addr_t addr, int n)
 {
-    static char addrs[4][16];
+    static char addrs[4][INET_ADDRSTRLEN];
     struct in_addr in;
 
     if (n < 0 || n >= 4)
@@ -29,6 +29,18 @@ char *fmtaddr(in_addr_t addr, int n)
     return strcpy(addrs[n], inet_ntoa(in));
 }
 
+// format ipv6 addr; n chooses one of 4 static buffers to use
+char *fmtaddr6(struct in6_addr *addr, int n)
+{
+    static char addrs[4][INET6_ADDRSTRLEN];
+
+    if (n < 0 || n >= 4)
+	return "";
+
+    inet_ntop(AF_INET6, addr, addrs[n], sizeof(addrs[n]));
+    return addrs[n];
+}
+
 char *fmtMacAddr(uint8_t *pMacAddr)
 {
 	// FF:FF:FF:FF:FF:FF (len(18)= 2*6 + 5 (:) + 1 (zero terminal))
diff --git a/util.h b/util.h
index 2345860..332c6f8 100644
--- a/util.h
+++ b/util.h
@@ -2,6 +2,7 @@
 #define __UTIL_H__
 
 char *fmtaddr(in_addr_t addr, int n);
+char *fmtaddr6(struct in6_addr *addr, int n);
 char *fmtMacAddr(uint8_t *pMacAddr);
 void *shared_malloc(unsigned int size);
 pid_t fork_and_close(void);