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Discussion on: Daily Challenge #31 - Count IPv4 Addresses

def ip2int ip
  ip.split(".").map(&:to_i).pack('CCCC').unpack('N')[0]
end

def ipsBetween start, end_
  ip2int(end_) - ip2int(start)
end

p ipsBetween("10.0.0.0", "10.0.0.50") # => 50
p ipsBetween("10.0.0.0", "10.0.1.0")  # => 256
p ipsBetween("20.0.0.10", "20.0.1.0") # => 246

ip2int() is from Stack Overflow.