Calculate network, netmask, host range and address counts from IPv4 CIDR.
Type or paste on the left — the result updates as you type.
Uses conventional network/broadcast exclusions for /0–/30, point-to-point handling for /31, and one host for /32. No network requests occur.
Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.
Tool page updated: 2026-09-27
