| Introduced | 1999 |
|---|---|
| TLD type | Reserved top-level domain |
| Status | Reserved to prevent conflict and confusion |
| Registry | IANA |
| Sponsor | None |
| Intended use | When necessary to show an address guaranteed to be invalid |
| Actual use | Popular to put at the end of intentionally-bad e-mail addresses used in newsgroup postings to avoid spam, |
| Registration restrictions | No registrations are possible |
| Structure | n/a |
| Documents | RFC 2606 |
| Dispute policies | None |
| Website | None |
invalid is a name reserved by the Internet Engineering Task Force (IETF) in RFC 2606 (June 1999) that is not intended to be installed as a top-level domain in the global Domain Name System (DNS) of the Internet.[1]
Other reserved names are test, localhost, and example.
The reasons for reservation of these top-level domain names is to reduce the likelihood of conflict and confusion.[1] This allows the use of these names for either documentation purposes or in local testing scenarios.
This top-level domain is sometimes used as a pseudo domain name in Uniform Resource Identifiers (URIs) to convey either an error condition or in use of privacy protection. A notable instance of this usage is in the Session Initiation Protocol (SIP) where the domain anonymous.invalid in a SIP URI indicates hiding of a callers identity.[2]
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