How to use it Enter an address with its prefix, such as 192.168.1.0/24 or 2001:db8::/32, and the network, range and host count appear. Further down, practise subnetting with questions.
Runs in your browser. Nothing is sent to the server.
Subnetting practice
Random questions with the working shown, for Network+, CCNA and the A+ networking objectives. Answer, then press Check, or press Show me how to see the method first. New to it? The subnetting cheat sheet walks through the method with worked examples.