IP Calculator

Note:

ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. Special thanks to Raymond Ferguson at share-foo.com and Krischan Jodies at jodies.de

IP & Netmask or CIDR:                        

Note:

Enter your netmask(s) in CIDR notation (/25) or dotted decimals (255.255.255.0). Inverse netmasks are recognized.
Look at the space between the bits of the addresses: The bits before it are the network part of the address, the bits after it are the host part. You can see two simple facts: In a network address all host bits are zero, in a broadcast address they are all set.
The class of your network is determined by its first bits.

Use IP & CIDR Netmask: 192.168.0.1/24
Or IP & Netmask:192.168.0.1 255.255.252.0
Or IP & Wildcard Mask:192.168.0.1 0.0.3.255