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IP Addressing & Subnetting · Module 6 of 10

Subnetting a network

Split a network into smaller subnets.

📖 Key ideas

  1. Borrow host bits to create subnets.
  2. Number of subnets = 2^(borrowed bits).
  3. Example: 192.168.10.0/24 into 4 subnets → /26 (borrow 2 bits).
  4. Each /26 has 64 addresses, 62 usable.
  5. Plan subnets for departments, floors or VLANs.
💡 Real-life example: Subnetting is dividing a big plot into equal smaller plots, each with its own gate.
Borrowed bitsHost bits used for subnetting
Subnet count2^borrowed bits
Equal-size subnetsAll subnets same mask
Subnet planAllocation of ranges