Do I need a dedicated IP to Install an SSL certificate?

Its possible to install an SSL without actually buying a dedicated IP and thatway your SSL will even come cheaper. If your server supports SNI (Server Name Indication), then you don't need a dedicated IP.

If your server however doesn't support SNI, then yes; you need one dedicated IP address per certificate. Since the SSL/TLS handshake happens before any HTTP headers (most notably the host header) are sent, there's no way that the web-server could know which certificate to send. You can host multiple domains/subdomains on one ip/port using a SAN or wildcard certificate certificate but you'd still need at least one dedicated IP.

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