Subnet Mask Calc
iOS Universal Utilities
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.
New ad engine
iOS 5 updates