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What is a Wildcard SSL certificate?

Date Submitted: 11-27-2013

A Wildcard SSL certificate secures your website URL, and an unlimited number of its subdomains. A single Wildcard certificate can secure both www.coolexample.com, and blog.coolexample.com.

Wildcard certificates secure the common name and all subdomains at the level you specify when you submit your request. Just add an asterisk (*) in the subdomain area to the left of the common name.

Examples

If you configure *.coolexample.com, you can secure:

  • coolexample.com
  • www.coolexample.com
  • photos.coolexample.com
  • blog.coolexample.com

If you configure *.www.coolexample.com, you can secure:

  • www.coolexample.com
  • mail.www.coolexample.com
  • photos.www.coolexample.com
  • blog.www.coolexample.com

Wildcard certificates secure websites the same as regular SSL certificates, and requests are processed using the same validation methods. However, some Web servers might require a unique IP address for each subdomain on the Wildcard certificate.

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