Small tools.
Less busywork.
Practical utilities for network planning and everyday administration. Calculations and passwords stay in your browser.
IPv4 subnet planner
Split a network into smaller subnets, join branches back together and give each subnet a label.
Choose Split to divide a subnet into two equal parts.
| Subnet | Label | Netmask | Address range | Usable IPs | Hosts | Split / join |
|---|
Join combines the selected subnet and everything within its immediate parent. Undo restores the previous layout. Up to 256 subnets per plan. /31 uses point-to-point semantics; /32 represents one host. For /0–/30, network and broadcast addresses are excluded from the usable range.
Plans run in your browser. Copied links include your network addresses and labels, so share them only with the people you intend.
Split a network
Divide a parent IPv4 network into equal subnets. Up to 256 subnets per calculation.
Random password generator
Uses your browser’s cryptographic random number generator. Passwords are never sent to this site’s server.