Free tools
Free tools
Small utilities for IT learners. No account needed. More are on the way.
Subnet calculator
Type an address and a prefix length to see the network, broadcast and usable range. The free Subnetting Starter module shows how to do it by hand.
- Mask
- Network
- Broadcast
- First host
- Last host
- Usable hosts
- the free Network Fundamentals course includes the subnet trainer lab
- quizzes and labs track your progress
- no card needed for free courses