What is a multi-domain SSL certificate?

    September 27, 2019

    Multi-domain SSL certificates allows one IP address to serve multiple domains and subdomains, though all of those domains must have the same owner.


    Multi-domain certificates are also known as a Subject Alternative Name (SAN) certificate. They are considered special due to the owner’s ability to secure multiple domains and sub-domains with one SSL certificate.  

    • www.example.com
    • example.com
    • blog.example.co.net
    • example.es

    Or multiple domain names, such as

    • www.example.com
    • example.co.net  
    • computing-ideas.com


    The only requirement is that all domain names are registered under the same domain owner.  Each domain listed on the account is required to prove domain ownership.  The following information is required from the client:

    • Applicant’s contact Information
    • Applicant’s corporate title

    How is the multi-domain SSL certificate issued?

    A multi-domain SSL certificate is structurally same as all other certificates. Multi-domain certificates allow for a single unique IP address for multiple domain names. A primary SSL certificate is issued with additional alternative domains listed on the same certificate.  One certificate can be installed for all domains listed within the approved list.


    A multi-domain name provides the ability to include multiple fully-qualified domain names (FQDN) within the same certificate. However, multi-domain certificates will only support the specific FQDN entered into the certificate. In most cases, multi-domain certificates will support up to 100 different FQDNs in one certificate. These certificates include the following:

    • Site Seal
    • Next Generation 2048-bit SSL
    • 256-bit encryption
    • Browser support
    • Mobile support
    • Free replacement
    • US$10,000.00 Warranty

    If you wish to purchase a multi-domain SSL Certificate, visit the Nexcess website or contact our sales team between 9 a.m. and 5 p.m. eastern time (ET), Monday through Friday.

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