The Misadventures of Penoi: How to get the last IP address on the Subnet using Ruby

How to get the last IP address on the Subnet using Ruby

>> require 'ipaddr'
>> ip=IPAddr.new("192.168.1.0/24")
=> #<IPAddr: IPv4:192.168.1.0/255.255.255.0>
>> gateway=IPAddr.new(ip.to_range.last.to_i-1,ip.family).to_s
=> "192.168.1.254"
>> ip=IPAddr.new("192.168.1.0/20")
=> #<IPAddr: IPv4:192.168.0.0/255.255.240.0>
>> gateway=IPAddr.new(ip.to_range.last.to_i-1,ip.family).to_s
=> "192.168.15.254"

to get the first ip of the subnet
>> gateway=IPAddr.new(ip.to_range.first.to_i+1,ip.family).to_s

By penoi on Friday, January 23, 2015 | ruby | A comment?

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