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samullen/cidr_validation.rb

Created August 20, 2010 19:37
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Testing IP's against CIDR. Whitelisting blocks.
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cidr_validation.rb
#!/usr/bin/ruby
require 'rubygems'
require 'ipaddr'
cidr = IPAddr.new("172.20.0.0")
# cidr = IPAddr.new("198.6.5.0")
mask = 16
# ip = IPAddr.new("198.6.5.22")
ip = IPAddr.new("172.20.155.101")
puts ip.to_i
puts cidr.to_i
puts ip.to_i & ~((1 << (32 - mask)) - 1) == cidr.to_i
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