Find out if an IP is within a range of IPs

Question

How can you tell if an ip, say 62.156.244.13 is within the range of 62.0.0.0 and 62.255.255.255

Answer 1

>> require "ipaddr"
=> true
>> low = IPAddr.new("62.0.0.0").to_i
=> 1040187392
>> high = IPAddr.new("62.255.255.255").to_i
=> 1056964607
>> ip = IPAddr.new("62.156.244.13").to_i
=> 1050473485
>> (low..high)===ip
=> true

If you are given the network instead of the start and end addresses, it is even simpler

>> net = IPAddr.new("62.0.0.0/8")
=> #
>> net===IPAddr.new("62.156.244.13")
=> true

IPAddr will also work with IPv6 addresses

>> low = IPAddr.new('1::')
=> #
>> high = IPAddr.new('2::')
=> #
>> (low..high)===IPAddr.new('1::1')
=> true