os.networkInterfaces() on osx el-capitan (10.11.1 (15B42))

interfaces.json

{ lo0:
   [ { address: '::1',
       netmask: 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
       family: 'IPv6',
       mac: '00:00:00:00:00:00',
       scopeid: 0,
       internal: true },
     { address: '127.0.0.1',
       netmask: '255.0.0.0',
       family: 'IPv4',
       mac: '00:00:00:00:00:00',
       internal: true },
     { address: 'fe80::1',
       netmask: 'ffff:ffff:ffff:ffff::',
       family: 'IPv6',
       mac: '00:00:00:00:00:00',
       scopeid: 1,
       internal: true } ],
  en0:
   [ { address: 'fe80::60c:ceff:fedf:abfc',
       netmask: 'ffff:ffff:ffff:ffff::',
       family: 'IPv6',
       mac: '04:0c:ce:df:ab:fc',
       scopeid: 4,
       internal: false },
     { address: '10.0.1.11',
       netmask: '255.255.255.0',
       family: 'IPv4',
       mac: '04:0c:ce:df:ab:fc',
       internal: false } ] }

/etc/hosts contains:

127.0.0.1   localhost
255.255.255.255 broadcasthost
::1             localhost