Enter an IP address and describe a subnet, and press Examine. Information about the address and mask will be displayed in the center of the page. At the very bottom you can determine what subnet mask you might need given the number of hosts or number of subnets you need in your network.
| Enter an IP address | |
| Subnet mask as |
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| About the address and subnet you provided | |
| IP address | |
| subnet address | |
| host address | |
| broadcast address | |
| address in binary | |
| address in hexadecimal | |
| address in decimal | |
| default address class | |
| About your subnet mask | |
| subnet mask | |
| mask length | |
| number of subnets | |
| number of hosts | |
| What mask length to use if you need ... | |
| this many hosts | |
| this many subnets | |