diff --git a/Common/config/default.json b/Common/config/default.json
index bf9a9669..88e6705d 100644
--- a/Common/config/default.json
+++ b/Common/config/default.json
@@ -39,6 +39,11 @@
 		"queueconverttask": "dc.converttask",
 		"queueconvertresponse": "dc.convertresponse"
 	},
+	"dnscache": {
+		"enable" : true,
+		"ttl" : 300,
+		"cachesize" : 1000
+	},
 	"services": {
 		"CoAuthoring": {
 			"server": {
diff --git a/Common/package.json b/Common/package.json
index cde73a51..9b56d39c 100644
--- a/Common/package.json
+++ b/Common/package.json
@@ -9,7 +9,9 @@
     "aws-sdk": "^2.4.12",
     "co": "^4.6.0",
     "config": "^1.21.0",
+    "dnscache": "0.0.4",
     "escape-string-regexp": "^1.0.5",
+    "ipaddr.js": "^1.2.0",
     "log4js": "^0.6.38",
     "mime": "^1.3.4",
     "mkdirp": "^0.5.1",
diff --git a/Common/sources/utils.js b/Common/sources/utils.js
index d2a53305..d6ca4278 100644
--- a/Common/sources/utils.js
+++ b/Common/sources/utils.js
@@ -37,6 +37,13 @@ var request = require('request');
 var co = require('co');
 var URI = require("uri-js");
 const escapeStringRegexp = require('escape-string-regexp');
+const ipaddr = require('ipaddr.js');
+var configDnsCache = config.get('dnscache');
+const dnscache = require('dnscache')({
+                                     "enable": configDnsCache.get('enable'),
+                                     "ttl": configDnsCache.get('ttl'),
+                                     "cachesize": configDnsCache.get('cachesize'),
+                                   });
 var constants = require('./constants');
 
 var configIpFilter = config.get('services.CoAuthoring.ipfilter');
@@ -511,11 +518,25 @@ function* pipeFiles(from, to) {
   yield pipeStreams(fromStream, toStream, true);
 }
 exports.pipeFiles = co.wrap(pipeFiles);
-function checkIpFilter(hostname) {
+function checkIpFilter(ipString, opt_hostname) {
   var status = 0;
-  for (var i = 0; i < g_oIpFilterRules.length; ++i) {
+  var ip4;
+  var ip6;
+  if (ipaddr.isValid(ipString)) {
+    var ip = ipaddr.parse(ipString);
+    if ('ipv6' == ip.kind()) {
+      if (ip.isIPv4MappedAddress()) {
+        ip4 = ip.toIPv4Address().toString();
+      }
+      ip6 = ip.toNormalizedString();
+    } else {
+      ip4 = ip.toString();
+      ip6 = ip.toIPv4MappedAddress().toNormalizedString();
+    }
+  }
+  for (i = 0; i < g_oIpFilterRules.length; ++i) {
     var rule = g_oIpFilterRules[i];
-    if (rule.exp.test(hostname)) {
+    if ((opt_hostname && rule.exp.test(opt_hostname)) || (ip4 && rule.exp.test(ip4)) || (ip6 && rule.exp.test(ip6))) {
       if (!rule.allow) {
         status = cfgIpFilterErrorCode;
       }
@@ -525,3 +546,15 @@ function checkIpFilter(hostname) {
   return status;
 }
 exports.checkIpFilter = checkIpFilter;
+function dnsLookup(hostname, options) {
+  return new Promise(function(resolve, reject) {
+    dnscache.lookup(hostname, options, function(err, addresses){
+      if (err) {
+        reject(err);
+      } else {
+        resolve(addresses);
+      }
+    });
+  });
+}
+exports.dnsLookup = dnsLookup;
\ No newline at end of file
diff --git a/DocService/package.json b/DocService/package.json
index cfb7d4e9..6b87daa7 100644
--- a/DocService/package.json
+++ b/DocService/package.json
@@ -12,7 +12,6 @@
     "express": "^4.14.0",
     "fakeredis": "^1.0.3",
     "forwarded": "^0.1.0",
-    "ipaddr.js": "^1.2.0",
     "mime": "^1.3.4",
     "multiparty": "^4.1.2",
     "mysql": "^2.11.1",
diff --git a/DocService/sources/DocsCoServer.js b/DocService/sources/DocsCoServer.js
index 180d767f..cd70b343 100644
--- a/DocService/sources/DocsCoServer.js
+++ b/DocService/sources/DocsCoServer.js
@@ -746,7 +746,8 @@ function* bindEvents(docId, callback, baseUrl, opt_userAction, opt_userData) {
     oCallbackUrl = parseUrl(callback);
     bChangeBase = c_oAscChangeBase.All;
     if (null !== oCallbackUrl) {
-      if (utils.checkIpFilter(oCallbackUrl.host) > 0) {
+      var hostIp = yield utils.dnsLookup(oCallbackUrl.host);
+      if (utils.checkIpFilter(hostIp, oCallbackUrl.host) > 0) {
         logger.error('checkIpFilter error: docId = %s;url = %s', docId, callback);
         //todo add new error type
         oCallbackUrl = null;
diff --git a/DocService/sources/server.js b/DocService/sources/server.js
index 5b3416c4..1c301e73 100644
--- a/DocService/sources/server.js
+++ b/DocService/sources/server.js
@@ -105,7 +105,6 @@ if (cluster.isMaster) {
   const bodyParser = require("body-parser");
   const mime = require('mime');
   const forwarded = require('forwarded');
-  const ipaddr = require('ipaddr.js');
   const docsCoServer = require('./DocsCoServer');
   const canvasService = require('./canvasservice');
   const converterService = require('./converterservice');
@@ -167,13 +166,6 @@ if (cluster.isMaster) {
     if (cfgIpFilterEseForRequest) {
       var addresses = forwarded(req);
       var ipString = addresses[addresses.length - 1];
-      //IPv6 -> IPv4
-      if (ipaddr.IPv6.isValid(ipString)) {
-        var ip = ipaddr.IPv6.parse(ipString);
-        if (ip.isIPv4MappedAddress()) {
-          ipString = ip.toIPv4Address().toString();
-        }
-      }
       status = utils.checkIpFilter(ipString);
     }
     if (status > 0) {
diff --git a/FileConverter/sources/converter.js b/FileConverter/sources/converter.js
index a712027e..4dfdb059 100644
--- a/FileConverter/sources/converter.js
+++ b/FileConverter/sources/converter.js
@@ -167,7 +167,8 @@ function* downloadFile(docId, uri, fileFrom) {
   var data = null;
   var downloadAttemptCount = 0;
   var urlParsed = url.parse(uri);
-  var filterStatus = utils.checkIpFilter(urlParsed.hostname);
+  var hostIp = yield utils.dnsLookup(urlParsed.hostname);
+  var filterStatus = utils.checkIpFilter(hostIp, urlParsed.hostname);
   if (0 == filterStatus) {
     while (!res && downloadAttemptCount++ < cfgDownloadAttemptMaxCount) {
       try {