Old-style classes of IP addresses

• Just look at the address to tell what class it is.

  • Class A: 0.0.0.0 to 127.255.255.255
    • binary 0xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • Class B: 128.0.0.0 to 191.255.255.255
    • binary 10xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • Class C: 192.0.0.0 to 223.255.255.255
    • binary 110xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • Class D: (multicast) 224.0.0.0 to 239.255.255.255
    • binary 1110xxxxxxxxxxxxxxxxxxxxxxxxxxxx
  • Class E: (reserved) 240.0.0.0 to 255.255.255.255

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