.invalid
The name invalid is reserved by the Internet Engineering Task Force as a domain name that may not be installed as a top-level domain in the Domain Name System... Wikipedia
- Introduced: 1999
- TLD type: Reserved top-level domain
- Status: Reserved to prevent conflict and confusion
- Intended use: When necessary to show an address guaranteed to be invalid
- Actual use: Session Initiation Protocol, for identity protection, address munging e.g. on Usenet
- Data source: DuckDuckGo