diff --git a/lib/net/upnp.js b/lib/net/upnp.js
index 29f52015..95302ae9 100644
--- a/lib/net/upnp.js
+++ b/lib/net/upnp.js
@@ -9,7 +9,6 @@
 var assert = require('assert');
 var dgram = require('dgram');
 var url = require('url');
-var os = require('os');
 var request = require('../http/request');
 var co = require('../utils/co');
 var Lock = require('../utils/lock');
@@ -299,77 +298,6 @@ UPNP.parseHeader = function parseHeader(str) {
   return headers;
 };
 
-/**
- * Get IP address from network interfaces.
- * @param {String} name - `public` or `private`.
- * @param {String} family - IP family name.
- * @returns {String}
- */
-
-UPNP.getInterfaceIP = function getInterfaceIP(name, family) {
-  var interfaces = os.networkInterfaces();
-  var keys = Object.keys(interfaces);
-  var i, j, key, items, details, type, ip;
-
-  for (i = 0; i < keys.length; i++) {
-    key = keys[i];
-    items = interfaces[key];
-
-    for (j = 0; j < items.length; j++) {
-      details = items[j];
-
-      type = details.family.toLowerCase();
-
-      if (type !== family)
-        continue;
-
-      try {
-        ip = IP.toBuffer(details.address);
-      } catch (e) {
-        continue;
-      }
-
-      if (IP.isLocal(ip))
-        continue;
-
-      if (name === 'public') {
-        if (!IP.isRoutable(ip))
-          continue;
-      }
-
-      return IP.toString(ip);
-    }
-  }
-};
-
-/**
- * Get local IP from network interfaces.
- * @returns {String}
- */
-
-UPNP.getLocalIP = function getLocalIP() {
-  var ip = UPNP.getInterfaceIP('private', 'ipv4');
-
-  if (ip)
-    return ip;
-
-  return UPNP.getInterfaceIP('private', 'ipv6');
-};
-
-/**
- * Get public IP from network interfaces.
- * @returns {String}
- */
-
-UPNP.getPublicIP = function getPublicIP() {
-  var ip = UPNP.getInterfaceIP('public', 'ipv4');
-
-  if (ip)
-    return ip;
-
-  return UPNP.getInterfaceIP('public', 'ipv6');
-};
-
 /**
  * Discover gateway.
  * @param {String?} host - Multicast IP.
@@ -512,7 +440,7 @@ UPNPService.prototype.getExternalIP = co(function* getExternalIP() {
 
 UPNPService.prototype.addPortMapping = co(function* addPortMapping(remote, src, dest) {
   var action = 'AddPortMapping';
-  var local = UPNP.getLocalIP();
+  var local = IP.getPrivate();
   var xml, child;
 
   if (!local)
diff --git a/lib/utils/ip.js b/lib/utils/ip.js
index 13f2ebcb..cff7f2b5 100644
--- a/lib/utils/ip.js
+++ b/lib/utils/ip.js
@@ -12,6 +12,7 @@
 'use strict';
 
 var assert = require('assert');
+var os = require('os');
 var base32 = require('./base32');
 
 /**
@@ -981,6 +982,80 @@ IP.isEqual = function isEqual(a, b) {
   return true;
 };
 
+/**
+ * Get IP address from network interfaces.
+ * @param {String} name - `public` or `private`.
+ * @param {String} family - IP family name.
+ * @returns {String}
+ */
+
+IP.getInterface = function getInterface(name, family) {
+  var interfaces = getInterfaces();
+  var keys = Object.keys(interfaces);
+  var i, j, key, items, details, type, ip;
+
+  for (i = 0; i < keys.length; i++) {
+    key = keys[i];
+    items = interfaces[key];
+
+    for (j = 0; j < items.length; j++) {
+      details = items[j];
+
+      type = details.family.toLowerCase();
+
+      if (type !== family)
+        continue;
+
+      if (details.internal)
+        continue;
+
+      try {
+        ip = IP.toBuffer(details.address);
+      } catch (e) {
+        continue;
+      }
+
+      if (IP.isLocal(ip))
+        continue;
+
+      if (name === 'public') {
+        if (!IP.isRoutable(ip))
+          continue;
+      }
+
+      return IP.toString(ip);
+    }
+  }
+};
+
+/**
+ * Get private IP from network interfaces.
+ * @returns {String}
+ */
+
+IP.getPrivate = function getPrivate() {
+  var ip = IP.getInterface('private', 'ipv4');
+
+  if (ip)
+    return ip;
+
+  return IP.getInterface('private', 'ipv6');
+};
+
+/**
+ * Get public IP from network interfaces.
+ * @returns {String}
+ */
+
+IP.getPublic = function getPublic() {
+  var ip = IP.getInterface('public', 'ipv4');
+
+  if (ip)
+    return ip;
+
+  return IP.getInterface('public', 'ipv6');
+};
+
 /**
  * Represents a parsed address.
  * @constructor
@@ -1005,6 +1080,16 @@ function Address(host, port, type, hostname, raw) {
   this.raw = raw || ZERO_IP;
 }
 
+/*
+ * Helpers
+ */
+
+function getInterfaces() {
+  if (os.unsupported)
+    return {};
+  return os.networkInterfaces();
+}
+
 /*
  * Expose
  */