CIDR Calculator
IPv4 / IPv6 subnet math
Calculate network ranges, masks, broadcast addresses, host counts, and IPv6 expanded forms from any IPv4 or IPv6 CIDR block.
How it works
Runs entirely in your browser using integer network math. Enter an address with a prefix to get the normalized network, address range, host-bit status, IPv4 netmask/wildcard/broadcast, or IPv6 expanded network and prefix mask.
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cidr—IPv4 / IPv6 subnet math
enter a cidr above and press Run →