What is an extended validation (EV) multi-domain SSL certificate?

What is an extended validation (EV) multi-domain SSL certificate?

Extended validation multi-domain SSL certificates allow a domain owner to assign multiple domains and sub-domains to a single SSL certificate. They differ from standard multi-domain SSL certificates in that they allow the inclusion of multiple fully qualified domain names (FQDN).


EV multi-domain certificates are also known as a Subject Alternative Name (SAN) certificate. They are considered special due to the owner’s ability to validate multiple domains and subdomains with a single 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


An EV multi-domain name provides the ability to include multiple fully qualified domain names (FQDN) within the same certificate. However, EV multi-domain certificates will only support the specific FQDN entered into the certificate. In most cases, EV multi-domain certificates will support up to 100 FQDNs in one certificate. Only one unique IP address is required per domain name and one can add domain names for a relatively low cost. This gives a business an affordable means of attaching multiple trading names to one certificate. 

  • Green address bar
  • Site Seal with EV Upgrader
  • Extended validation
  • Next Generation 2048-bit SSL
  • 256-bit encryption
  • Browser support
  • Mobile support
  • Free replacement
  • $250,000.00 (USD) Warranty

What is the green address bar?

Web-fraud scams constantly evolve and adapt. With concerns about identity theft and online imposters increasing, the green address bar is an expansion of the visual cues offered by lower level SSL certificates. 

Figure 1. PayPal’s Green Address Bar.

Client requirements

The first requirement is that all domain names are registered under the same same owner. As the highest class of SSL certificates available, Extended Validation SSL Certificates (EV SSL) activate both the padlock and the green address bar in all major browsers.

  • Proof of domain ownership
  • Online public directory information
  • Articles of incorporation
  • Certificate of formation
  • Charter documents
  • Business license
  • Doing business as
  • Registration of trade name
  • Partnership papers
  • Fictitious name statement
  • Vendor/Reseller/Merchant License
  • Merchant license

How do I get one?

An Extended Validation Certificate (EV) is structurally the same as other certificates, offering the same level of security, but were designated with a CA specific policy identifier so that EV aware software can recognize a EV secured site. EV certificates are issued by Nexcess according to a specific set of identity validation criteria. Refer to How to purchase an extended validation (EV) standard SSL certificate for additional information. 

For more information or sales inquiries, visit the Nexcess website or contact our Sales Team between 9 a.m. and 5 p.m. eastern time (ET), Monday - Friday.

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