# Server Name Indication

> TLS extension, where a client states the hostname at the start of the handshake so that a server can present multiple certificates on the same address/port; so it can serve multiple HTTPS sites at the same IP address with different certificates

**Wikidata**: [Q906028](https://www.wikidata.org/wiki/Q906028)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Server_Name_Indication)  
**Source**: https://4ort.xyz/entity/server-name-indication