Enter an IPv4 address with a CIDR prefix, for example 192.168.1.0/24. You get the network and broadcast addresses, netmask, wildcard mask, usable host range, host counts, and a binary view. There is also a helper to split the block into equal subnets. Nothing leaves this page.
Accepts a /prefix from 0 to 32. If you enter a host address such as 192.168.1.42/24, it is normalized to the containing network.
Overview
CIDR notation
Network address
Broadcast address
Netmask
Wildcard mask
First usable host
Last usable host
Total addresses
Usable hosts
Range type
Binary view
The blue bits are the network portion (the prefix). The green bits are the host portion.