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CIDR

  • Classless Inter-Domain Routing: A method for allocating IP addresses.

Base IP​

  • Represents IP contained in the range.

Subnet Mask​

  • Defines how many bits can change in IP.
    • /8 <-> 255.0.0.0
    • /16 <-> 255.255.0.0
    • /24 <-> 255.255.255.0
    • /32 <-> 255.255.255.255
  • Subnet Mask allows part of underlying IP to get additional next values from base IP.
    • /32: no octet can change
    • /24: last octet can change
    • /16: last 2 octets can change
    • /8: last 3 octets can change
    • /0: all octets can change