Adding an additional **SAN certificate** (*Subject Alternative Name*) with SSL Certificate purchase, can secure multiple domains on single server.

If you want to secure two domains on single server, then you should buy a 1 certificate with adding a 1 SAN certificate during purchase.

*Below table shows the number of domains on single server with requirement of SSL Certificates:*

>                  2 domains = 1 Certificate + 1 SAN

>                  3 domains = 1 certificate + 2 SANs

>                            :		     :

>                            :		     : 

>                  N domains = 1 Certificate + (n-1) SANs

Generally, Major certificate Authorities allows you to add additional SAN up to 24. It may vary by Certificate Authority.

###Selection of Certificate:###

There are three types of SSL Certificates **DV** (*domain validated*), **OV** (*organization validated*) and **EV** (*extended validation*) certificates. You should buy OV or EV certificate, because it has better SAN option then the DV certificate.