Server Name Indication (SNI) is an extension to Transport Layer Security (TLS) where a client indicates which hostname it is attempting to connect to at the start of the handshaking process. The extension allows a server to present one of multiple possible certificates on the same IP address and port number, allowing for multiple services (including HTTPS websites) to be served by the same IP address without using a single certificate.
Server Name Indication (SNI) is an extension to Transport Layer Security (TLS) where a client indicates which hostname it is attempting to connect to at the start of the handshaking process. The extension allows a server to present one of multiple possible certificates on the same IP address and port number, allowing for multiple services (including HTTPS websites) to be served by the same IP address without using a single certificate.
Source: Wikipedia "Server Name Indication" · CC BY-SA 4.0
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