Network tools workbench
Practical DNS, HTTP, TLS, IP, and encoding utilities.
Encoding tools run locally in your browser. Input is not transmitted.
IP and subnet calculator
DNS lookup
Reverse DNS
HTTP header checker
Private, loopback, link-local, metadata, and internal targets are blocked.
Redirect checker
TLS certificate inspector
CIDR splitter
CIDR aggregator
Port lookup
MAC/OUI lookup
Uses a bundled seed map; it is not a complete IEEE registry.
Mail DNS check
DNSSEC check
Unix utilities
Encode/decode toolbox
Runs locally in your browser. Input is not transmitted.
JWT decoding does not verify its signature or authenticity.