Networking Tools

IP Calculator

Network, broadcast, host range and class for an address and mask, plus subnet and supernet splits.

Subnet Visualizer

Divide a network into subnets and join them back, with a bookmarkable layout.

JSON Syntax Checker

Paste JSON to find errors with the exact line and column. Format and minify too.

SSL Checker

Decode a certificate, chain or CSR: SAN names, dates, issuer, key, usage and fingerprints.