IPv4 Subnet Calculator

Compute network, broadcast, usable host range, mask and wildcard from an IP and CIDR — plus class and private-range flags.

Security & Network100% client-sideFree · no sign-up

subnet-calculator — tool

IPv4 address

Prefix length (/cidr)

Result

Result appears here automatically.

runs 100% client-side · your data never leaves the browser

how_to — subnet-calculator

How to use the ipv4 subnet calculator

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