Netmask = require('netmask').Netmask ip = process.argv[2] netmask = new Netmask(ip) out = console.log out "Address: #{ip.split('/', 1)[0]}" out "Netmask: #{netmask.mask} = #{netmask.bitmask}" out "Wildcard: #{netmask.hostmask}" out "=>" out "Network: #{netmask.base}/#{netmask.bitmask}" out "HostMin: #{netmask.first}" out "HostMax: #{netmask.last}" out "Broadcast: #{netmask.broadcast}" out "Hosts/Net: #{netmask.size}" out netmask.next()