CIDR Cheat Sheet

Filter a complete /0–/32 IPv4 subnet reference table and copy or download the values as CSV.

Filter prefix

Host-count convention

How to use this CIDR Cheat Sheet

Browse IPv4 CIDR prefixes, subnet masks, wildcard masks, address counts, and usable host counts. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.