IPv4 subnet calculator

Turn an IP/prefix into the network, broadcast, netmask, wildcard, usable host range and host count — and see whether it is private, CGNAT, link-local or public.

Enter an IPv4 address (optionally with prefix, e.g. 192.168.1.10/24)

Network—

Broadcast—

Netmask—

Wildcard—

Usable host range—

Usable hosts—

Total addresses—

Address type—

Computed locally in your browser — nothing is sent anywhere. · Try:

What this shows

Network & broadcast — the first and last address of the block.
Netmask & wildcard — dotted-decimal mask and its inverse (as used by ACLs).
Usable range & count — first/last assignable address and how many hosts fit.
Type — private (RFC 1918), CGNAT, link-local, multicast, loopback or public.

Related reading: how NAT traversal worksand segmenting a home network.