A fast Subnet Mask Calculator. This can be used with no network connectivity. Free to use and enjoy. Great of IT engineers to figure out network IPs, and wildcard masks quickly.

This is also a great tool for Networking students to learn sub-netting. Use it to check your work while you are working for your Network+ or CCNA

Phamily Phinder is a great tool for keeping track of your on-the-go family.

Start out with a 15 day Free Trial to get your Phamily set up and interacting with the application. Then from there you can choose the best subscription for you out of our 1, 3, 6, and 12 month packages. Head over to the website for a lot more details:
www.mtr-productions.com