JSON netmask -> CIDR mapping

netmaskToCIDR.json

{
  "0.0.0.0": 0,
  "128.0.0.0": 1,
  "192.0.0.0": 2,
  "224.0.0.0": 3,
  "240.0.0.0": 4,
  "248.0.0.0": 5,
  "252.0.0.0": 6,
  "254.0.0.0": 7,
  "255.0.0.0": 8,
  "255.128.0.0": 9,
  "255.192.0.0": 10,
  "255.224.0.0": 11,
  "255.240.0.0": 12,
  "255.248.0.0": 13,
  "255.252.0.0": 14,
  "255.254.0.0": 15,
  "255.255.0.0": 16,
  "255.255.128.0": 17,
  "255.255.192.0": 18,
  "255.255.224.0": 19,
  "255.255.240.0": 20,
  "255.255.248.0": 21,
  "255.255.252.0": 22,
  "255.255.254.0": 23,
  "255.255.255.0": 24,
  "255.255.255.128": 25,
  "255.255.255.192": 26,
  "255.255.255.224": 27,
  "255.255.255.240": 28,
  "255.255.255.248": 29,
  "255.255.255.252": 30,
  "255.255.255.254": 31,
  "255.255.255.255": 32
}