What Is a Wildcard SSL Certificate?

A wildcard SSL certificate protects all subdomains of your domain with a single certificate. It is issued as *.yourdomain.com.

Subdomains covered and not covered by a wildcard certificate

What does it cover?

AddressStatus
www.yourdomain.com, blog.yourdomain.com, shop.yourdomain.comCovered
yourdomain.com (main domain)Included as an extra name in most certificates
shop.blog.yourdomain.comNot covered (second-level subdomain)

Advantages

  • When you add a new subdomain, you do not need another certificate.
  • One certificate is easy to manage and renew.
  • Cheaper if you have many subdomains.

When creating the CSR for a wildcard certificate, enter the domain as *.yourdomain.com. Let's Encrypt wildcard certificates are only issued with DNS validation.

Wildcard options: SSL Certificates

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