How SANs are counted

  Multi-domain certificates FAQ

All multi-domain SSL certificates have 3 SANs by default.
A SAN is a domain seat/slot in an SSL’s configuration. Here is an example of how SANs work:

While and are technically 1 website, the www version and the non-www version take 2 separate seats.

With the default multi-domain configuration of 3 SANs, you would be able to secure and, as well as another domain,

To have both the www and non-www versions of and secured, you would need 4 SANs, which adds 1 extra SAN to the default multi-domain SSL configuration.

Any SANs beyond 3 SANs have an extra fee, which varies depending on SSL type.