diff --git a/src/HttpServer.cc b/src/HttpServer.cc
index ca8ee39d..1c986410 100644
--- a/src/HttpServer.cc
+++ b/src/HttpServer.cc
@@ -1536,8 +1536,7 @@ int start_listen(struct ev_loop *loop, Sessions *sessions,
       new ListenEventHandler(sessions, fd, acceptor);
 
       if (config->verbose) {
-        char s[INET6_ADDRSTRLEN];
-        get_ip_str((struct sockaddr *)rp->ai_addr, s, sizeof s);
+        std::string s = util::numeric_name(rp);
         std::cout << (rp->ai_family == AF_INET ? "IPv4" : "IPv6") << ": listen "
                   << s << ":" << config->port << std::endl;
       }
diff --git a/src/nghttp.cc b/src/nghttp.cc
index 1bc0392d..ccff2567 100644
--- a/src/nghttp.cc
+++ b/src/nghttp.cc
@@ -107,20 +107,6 @@ std::string strip_fragment(const char *raw_uri) {
 }
 } // namespace
 
-namespace {
-// Returns numeric address string of |addr|.  If getnameinfo() is
-// failed, "unknown" is returned.
-std::string numeric_name(addrinfo *addr) {
-  char host[NI_MAXHOST];
-  auto rv = getnameinfo(addr->ai_addr, addr->ai_addrlen, host, sizeof(host),
-                        nullptr, 0, NI_NUMERICHOST);
-  if (rv != 0) {
-    return "unknown";
-  }
-  return host;
-}
-} // namespace
-
 Request::Request(const std::string &uri, const http_parser_url &u,
                  const nghttp2_data_provider *data_prd, int64_t data_length,
                  const nghttp2_priority_spec &pri_spec,
@@ -688,13 +674,13 @@ int HttpClient::noop() { return 0; }
 void HttpClient::on_connect_fail() {
   if (state == STATE_IDLE) {
     std::cerr << "[ERROR] Could not connect to the address "
-              << numeric_name(cur_addr) << std::endl;
+              << util::numeric_name(cur_addr) << std::endl;
   }
   auto cur_state = state;
   disconnect();
   if (cur_state == STATE_IDLE) {
     if (initiate_connection() == 0) {
-      std::cerr << "Trying next address " << numeric_name(cur_addr)
+      std::cerr << "Trying next address " << util::numeric_name(cur_addr)
                 << std::endl;
     }
   }
diff --git a/src/util.cc b/src/util.cc
index eafe13b9..8dea595b 100644
--- a/src/util.cc
+++ b/src/util.cc
@@ -686,6 +686,18 @@ bool numeric_host(const char *hostname) {
   return true;
 }
 
+// Returns numeric address string of |addr|.  If getnameinfo() is
+// failed, "unknown" is returned.
+std::string numeric_name(addrinfo *addr) {
+  char host[NI_MAXHOST];
+  auto rv = getnameinfo(addr->ai_addr, addr->ai_addrlen, host, sizeof(host),
+                        nullptr, 0, NI_NUMERICHOST);
+  if (rv != 0) {
+    return "unknown";
+  }
+  return host;
+}
+
 int reopen_log_file(const char *path) {
 #if defined(__ANDROID__) || defined(ANDROID)
   int fd;
diff --git a/src/util.h b/src/util.h
index 8f63fe37..f4246d40 100644
--- a/src/util.h
+++ b/src/util.h
@@ -29,6 +29,7 @@
 
 #include <unistd.h>
 #include <getopt.h>
+#include <netdb.h>
 
 #include <cstring>
 #include <cassert>
@@ -417,6 +418,8 @@ void write_uri_field(std::ostream &o, const char *uri, const http_parser_url &u,
 
 bool numeric_host(const char *hostname);
 
+std::string numeric_name(addrinfo *addr);
+
 // Opens |path| with O_APPEND enabled.  If file does not exist, it is
 // created first.  This function returns file descriptor referring the
 // opened file if it succeeds, or -1.