diff --git a/bin/tsw/ajax/ajax.js b/bin/tsw/ajax/ajax.js
index 0e988eba..68aec9b9 100644
--- a/bin/tsw/ajax/ajax.js
+++ b/bin/tsw/ajax/ajax.js
@@ -14,6 +14,7 @@ const http = require('http');
 const https = require('https');
 const vm = require('vm');
 const url = require('url');
+const net = require('net');
 const qs = require('qs');
 const form = require('./form.js');
 const token = require('./token.js');
@@ -553,14 +554,21 @@ Ajax.prototype.doRequest = function(opt) {
     request.setSocketKeepAlive(true);
 
     request.once('socket', function(socket) {
-        socket.once('lookup', (err, address, family, host) => {
-            if (err) {
-                logger.error(logPre + err.stack);
-                this.emit('fail');
-                return;
-            }
-            this.remoteIp = address;
-        });
+        if (socket.remoteAddress) {
+            this.remoteIp = socket.remoteAddress;
+            return;
+        }
+
+        if (!net.isIP(opt.host)) {
+            socket.once('lookup', (err, address, family, host) => {
+                if (err) {
+                    logger.error(logPre + err.stack);
+                    this.emit('fail');
+                    return;
+                }
+                this.remoteIp = address;
+            });
+        }
     });
 
     defer.always(function() {
diff --git a/bin/tsw/runtime/capturer.js b/bin/tsw/runtime/capturer.js
index 32591f69..24a143ed 100644
--- a/bin/tsw/runtime/capturer.js
+++ b/bin/tsw/runtime/capturer.js
@@ -14,6 +14,7 @@
  */
 const http = require('http');
 const https = require('https');
+const net = require('net');
 let isFirstLoad = true;
 
 if (global[__filename]) {
@@ -160,16 +161,28 @@ process.nextTick(function() {
             };
 
             request.once('socket', function(socket) {
-                socket.once('lookup', (err, address, family, host) => {
+                if (socket.remoteAddress) {
                     timeLookup = Date.now();
-                    if (err) {
-                        logger.error(logPre + err.stack);
-                        finish();
-                        return;
-                    }
+                    timeConnect = Date.now();
+                    remoteAddress = socket.remoteAddress;
+                    remotePort = socket.remotePort;
                     const cost = timeLookup - timeStart;
-                    logger.debug(`${logPre}dns lookup ${host} -> ${address}, cost ${cost}ms`);
-                });
+                    logger.debug(`${logPre}socket reuse ${remoteAddress}:${remotePort}, cost ${cost}ms`);
+                    return;
+                }
+
+                if (!net.isIP(opt.host)) {
+                    socket.once('lookup', (err, address, family, host) => {
+                        timeLookup = Date.now();
+                        if (err) {
+                            logger.error(logPre + err.stack);
+                            finish();
+                            return;
+                        }
+                        const cost = timeLookup - timeStart;
+                        logger.debug(`${logPre}dns lookup ${host} -> ${address}, cost ${cost}ms`);
+                    });
+                }
 
                 socket.once('connect', function() {
                     timeConnect = Date.now();