Use this site to learn and practice subnetting.
If you are taking CCNA training or studying for the Network+ certification, subnetting practice is an essential requirement.
Subnetting.net provides a wide range of practice questions in the 'Practice' section and also in our timed subnetting quiz.
Don't foul out though, when the clock is running, you better bring your A-Game!
Mar 10, 2014: Improved Enter key functionality for auto-answer and auto-advance. See Tips & Tricks for more details.
Mar 4, 2014: Create your own account! Now you can track all of your scores, jump to a particular question type, and build up your "Career Points". Click on the Free Account link for more details.