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$ node
> var os = require('os')
undefined
> os.networkInterfaces()
{ lo0: 
   [ { address: 'fe80::1',
       family: 'IPv6',
       internal: true },
     { address: '127.0.0.1',
       family: 'IPv4',
       internal: true },
     { address: '::1',
       family: 'IPv6',
       internal: true } ],
  en0: 
   [ { address: 'fe80::1610:9fff:fed3:b059',
       family: 'IPv6',
       internal: false },
     { address: '192.168.0.201',
       family: 'IPv4',
       internal: false } ] }
>