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Subnet Mask

Divides the network into 2 more more divisons.

  • An IP address is a 32-bit number usually like: 192.168.1.2

The most common subnet mask for small home networks:

255.255.255.0 = 11111111.11111111.11111111.00000000
  • The 1's are the network portion
    • first 32 bits
  • The 0's are the host portion
    • last 8 bits
    • identifies the device on the network

Citations

  • https://en.wikipedia.org/wiki/Subnet