The name localhost is reserved by the Internet Engineering Task Force (IETF) as a domain name label that may not be installed as a top-level domain in the Domain Name System (DNS) of the Internet.
via Wikipedia infobox
.localhost域名是由互联网工程任务组（IETF）在RFC 2606 （1999年6月）文件中规定在互联网域名系统（DNS）中所被保留的不被安装为顶级域的域名标签。
Abstract from DBpedia / Wikipedia · CC BY-SA
via Wikidata sitelinks · CC0
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).