Local IPv4 subnet calculator / privacy-first
IPv4 subnet calculator
Check the network, broadcast, usable host range, and count from IPv4/CIDR locally in your browser.
Enter IPv4/CIDR
The address is not on the network boundary; the normalized CIDR is shown.
Input is processed locally and is never sent externally.
Supported
- IPv4 `/0` to `/32`, network, broadcast, usable host range, and host count.
- `/31` shows two usable addresses and `/32` shows one.
- IPv6, subnet splitting, ACL generation, and external requests are not supported.