If you already have a Multi-Domain SSL certificate, you can simply start the reissue process and add the corresponding number of SANs to your certificate. The regular checkout flow will prompt you to purchase additional domains.
Note: Starting May 3, 2016, Comodo (now Sectigo) certificates can be reissued for any common name at no additional cost.
The additional domain names (SANs) can be changed completely during reissue as well, e.g. from domain.com to example.net.
: Please keep in mind that the validity
period and the price for the additional SAN (Subject Alternative Name,
additional domain in the Multi-Domain certificate), ordered after
the certificate purchase will not be pro-rated.
This means that:
- The SAN, added to the Multi-Domain certificate any time after its purchase, will cost the same price as the SAN ordered along with the Multi-Domain certificate during the initial purchase;
- The SAN will expire together with the certificate it is attached to regardless of the exact date of SAN's purchase.