require'ipaddr'IPAddr
IPAddr provides a set of methods to manipulate an IP address. Both IPv4 and IPv6 are supported.
require'ipaddr'ipaddr1=IPAddr.new"3ffe:505:2::1"pipaddr1#=> #<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0001/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff>pipaddr1.to_s#=> "3ffe:505:2::1"ipaddr2=ipaddr1.mask(48)#=> #<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0000/ffff:ffff:ffff:0000:0000:0000:0000:0000>pipaddr2.to_s#=> "3ffe:505:2::"ipaddr3=IPAddr.new"192.168.2.0/24"pipaddr3#=> #<IPAddr: IPv4:192.168.2.0/255.255.255.0>