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# IP [](https://www.npmjs.com/package/ip) IP address utilities for node.js ## Installation ### npm ```shell npm install ip ``` ### git ```shell git clone https://github.com/indutny/node-ip.git ``` ## Usage Get your ip address, compare ip addresses, validate ip addresses, etc. ```js var ip = require('ip'); ip.address() // my ip address ip.isEqual('::1', '::0:1'); // true ip.toBuffer('127.0.0.1') // Buffer([127, 0, 0, 1]) ip.toString(new Buffer([127, 0, 0, 1])) // 127.0.0.1 ip.fromPrefixLen(24) // 255.255.255.0 ip.mask('192.168.1.134', '255.255.255.0') // 192.168.1.0 ip.cidr('192.168.1.134/26') // 192.168.1.128 ip.not('255.255.255.0') // 0.0.0.255 ip.or('192.168.1.134', '0.0.0.255') // 192.168.1.255 ip.isPrivate('127.0.0.1') // true ip.isV4Format('127.0.0.1'); // true ip.isV6Format('::ffff:127.0.0.1'); // true // operate on buffers in-place var buf = new Buffer(128); var offset = 64; ip.toBuffer('127.0.0.1', buf, offset); // [127, 0, 0, 1] at offset 64 ip.toString(buf, offset, 4); // '127.0.0.1' // subnet information ip.subnet('192.168.1.134', '255.255.255.192') // { networkAddress: '192.168.1.128', // firstAddress: '192.168.1.129', // lastAddress: '192.168.1.190', // broadcastAddress: '192.168.1.191', // subnetMask: '255.255.255.192', // subnetMaskLength: 26, // numHosts: 62, // length: 64, // contains: function(addr){...} } ip.cidrSubnet('192.168.1.134/26') // Same as previous. // range checking ip.cidrSubnet('192.168.1.134/26').contains('192.168.1.190') // true // ipv4 long conversion ip.toLong('127.0.0.1'); // 2130706433 ip.fromLong(2130706433); // '127.0.0.1' ``` ### License This software is licensed under the MIT License. Copyright Fedor Indutny, 2012. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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