diff --git a/index.js b/index.js
index 399f853..a865134 100644
--- a/index.js
+++ b/index.js
@@ -1,63 +1,7 @@
-const os = require('os')
-const dns = require('dns')
-const util = require('util')
-
-module.exports = {
-
-  /*----------------------------------------------------------------
-  * Network tools
-  ----------------------------------------------------------------*/
-  async dn2ip(host) {
-    // domain name 2 ip
-    if (typeof host === 'string' && host) {
-      var ip = await util
-        .promisify(dns.resolve)(host, 'A')
-        .catch(function (err) {
-          mylog.warn('WARNING : host cannot resolve to ip: ' + host)
-          return null
-        })
-      if (ip && /^\d+\.\d+\.\d+\.\d+$/.test(ip[0])) {
-        return ip[0]
-      }
-    }
-    return null
-  },
-  isPrivateIp(addr) {
-    return (
-      /^(::f{4}:)?10\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
-      /^(::f{4}:)?192\.168\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
-      /^(::f{4}:)?172\.(1[6-9]|2\d|30|31)\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
-      /^(::f{4}:)?127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
-      /^(::f{4}:)?169\.254\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
-      /^f[cd][0-9a-f]{2}:/i.test(addr) ||
-      /^fe80:/i.test(addr) ||
-      /^::1$/.test(addr) ||
-      /^::$/.test(addr)
-    )
-  },
-  getMyIp() {
-    var publicIp = null
-    var privateIp = null
-    var self = this
-    try {
-      var ifaces = os.networkInterfaces()
-      Object.keys(ifaces).forEach(function (ifname) {
-        ifaces[ifname].forEach(function (iface) {
-          if ('IPv4' === iface.family && iface.internal === false) {
-            //            console.log('ip='+iface.address)
-            if (self.isPrivateIp(iface.address)) {
-              privateIp = iface.address
-              //              console.log('privateIp='+privateIp)
-            } else {
-              publicIp = iface.address
-              //              console.log('publicIp='+publicIp)
-            }
-          }
-        })
-      })
-    } catch (e) {
-      console.log('ERROR in getMyIP(): ' + e.message)
-    }
-    return publicIp || privateIp
-  },
-}
+const tool4net = require('./tool4net.js')
+const tool4log = require('./tool4log')
+
+module.exports = {
+  tool4net,
+  tool4log
+}
diff --git a/package.json b/package.json
index 2c8c16f..2276031 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "base.nettool",
+  "name": "base.tool",
   "version": "1.0.0",
   "description": "",
   "main": "index.js",
@@ -8,8 +8,11 @@
   },
   "repository": {
     "type": "git",
-    "url": "https://git.faronear.org/npm/base.nettool"
+    "url": "https://git.faronear.org/npm/base.tool"
   },
   "author": "",
-  "license": "ISC"
+  "license": "ISC",
+  "dependencies": {
+    "colors": "^1.4.0"
+  }
 }
diff --git a/tool4log.js b/tool4log.js
new file mode 100644
index 0000000..e70dcc2
--- /dev/null
+++ b/tool4log.js
@@ -0,0 +1,7 @@
+const colors = require('colors')
+
+module.exports = {
+  colog(...args) {
+    console.log(colors.green({time: new Date().toJSON()}), ...args)
+  }
+}
diff --git a/tool4net.js b/tool4net.js
new file mode 100644
index 0000000..399f853
--- /dev/null
+++ b/tool4net.js
@@ -0,0 +1,63 @@
+const os = require('os')
+const dns = require('dns')
+const util = require('util')
+
+module.exports = {
+
+  /*----------------------------------------------------------------
+  * Network tools
+  ----------------------------------------------------------------*/
+  async dn2ip(host) {
+    // domain name 2 ip
+    if (typeof host === 'string' && host) {
+      var ip = await util
+        .promisify(dns.resolve)(host, 'A')
+        .catch(function (err) {
+          mylog.warn('WARNING : host cannot resolve to ip: ' + host)
+          return null
+        })
+      if (ip && /^\d+\.\d+\.\d+\.\d+$/.test(ip[0])) {
+        return ip[0]
+      }
+    }
+    return null
+  },
+  isPrivateIp(addr) {
+    return (
+      /^(::f{4}:)?10\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
+      /^(::f{4}:)?192\.168\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
+      /^(::f{4}:)?172\.(1[6-9]|2\d|30|31)\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
+      /^(::f{4}:)?127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
+      /^(::f{4}:)?169\.254\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) ||
+      /^f[cd][0-9a-f]{2}:/i.test(addr) ||
+      /^fe80:/i.test(addr) ||
+      /^::1$/.test(addr) ||
+      /^::$/.test(addr)
+    )
+  },
+  getMyIp() {
+    var publicIp = null
+    var privateIp = null
+    var self = this
+    try {
+      var ifaces = os.networkInterfaces()
+      Object.keys(ifaces).forEach(function (ifname) {
+        ifaces[ifname].forEach(function (iface) {
+          if ('IPv4' === iface.family && iface.internal === false) {
+            //            console.log('ip='+iface.address)
+            if (self.isPrivateIp(iface.address)) {
+              privateIp = iface.address
+              //              console.log('privateIp='+privateIp)
+            } else {
+              publicIp = iface.address
+              //              console.log('publicIp='+publicIp)
+            }
+          }
+        })
+      })
+    } catch (e) {
+      console.log('ERROR in getMyIP(): ' + e.message)
+    }
+    return publicIp || privateIp
+  },
+}