System Grab Bag
IPv4 Subnet Calculator
This calculator and tool allows you to type an IP address in and get information on a particular subnet. Enter an IP or range in CIDR notation.
Calculate
You can also use some of the other examples such as:
0.0.0.0/0
1.0.0.0/8
127.0.0.1
30.0.0.0/8
192.168.0.0/16