Tools

Small tools for everyday networking.

Things I need often enough myself and that do not deserve a sign-up form. Everything is calculated in your browser — no input ever leaves your device.

Subnet Calculator

Enter an IPv4 address and prefix: network address, host range, broadcast, subnet and wildcard mask, plus the bit boundary between network and host portion.

VLSM Planner

Split a network into subnets of differing size. Enter the demand per subnet and the allocation appears immediately, with masks, ranges and utilisation.