IANA Example Domains

Reserved Name Checker

Classifies names against RFC 2606 and RFC 6761 · Reference tool, not a registrar

Type a domain name and this tool classifies it against the reserved and special-use lists in RFC 2606 and RFC 6761. It explains which rule applies and points at the governing clause. It is a documentation aid — not a registration service, and it does not report whether a name is available to buy.

Press Enter to check. Your typed value is kept after every check.

Try these

Pick a sample name to fill the field and run the check.

Scope. This checker only compares a name with the reserved and special-use lists in RFC 2606 and RFC 6761. It is not a registration service and never checks live availability. Reserved documentation domains exist for examples, tests and documentation — never for production use.

Back to Example Domains RFC 2606 — Reserved Top Level DNS Names RFC 6761 — Special-Use Domain Names
IANA — Internet Assigned Numbers Authority logo, linking to the Example Domains reference
The reference page lists every reserved name, with do / don’t guardrails and copy-ready snippets.