How SSL Certificate Wildcards Can Help Secure Your Website’s Subdomains


Securing a website is crucial for protecting sensitive information and ensuring the trust of visitors. One important aspect of website security is the use of SSL certificates. SSL (Secure Sockets Layer) certificates encrypt the data transmitted between a website and its visitors, ensuring that it cannot be intercepted by unauthorized parties. However, what happens when a website has multiple subdomains? How can one SSL certificate cover all of them? The answer is SSL certificate wildcards.

What are SSL certificate wildcards?

An SSL certificate wildcard is a type of SSL certificate that covers all subdomains of a specific domain. For example, if you own the domain and want to secure all subdomains, such as,, and so on, you can use an SSL certificate wildcard. The wildcard character (*) in the certificate’s Common Name field represents any subdomain of the specified domain.

How do SSL certificate wildcards work?

When a website uses an SSL certificate wildcard, the certificate covers all subdomains of the specified domain, regardless of their name or number. For example, if the SSL certificate wildcard is issued to *, it will cover,, and any other subdomain of

To understand how SSL certificate wildcards work, it’s important to know how SSL certificates validate domain ownership. SSL certificates are issued by Certificate Authorities (CAs), who are trusted entities responsible for verifying the identity of website owners. When a website owner applies for an SSL certificate, the CA performs a series of checks to ensure that the applicant owns the domain they are requesting a certificate for.

With SSL certificate wildcards, the validation process is the same as with regular SSL certificates, but the certificate covers multiple subdomains instead of a single domain. The CA verifies the ownership of the parent domain (e.g., and confirms that the applicant has control over all subdomains.

Benefits of using SSL certificate wildcards

Using SSL certificate wildcards can offer several benefits for website owners, including:

Cost-effective: An SSL certificate wildcard can cover an unlimited number of subdomains, which can be more cost-effective than purchasing individual certificates for each subdomain.

Simplifies certificate management: Managing multiple SSL certificates for different subdomains can be time-consuming and complicated. With an SSL certificate wildcard, the certificate management process is simplified, as one certificate covers all subdomains.

Enhances security: Using SSL certificate wildcards enhances the security of all subdomains, as they all benefit from the same level of encryption and protection.

Improves user experience: Visitors to a website that uses SSL certificate wildcards will see the familiar padlock icon in their browser, indicating that the website is secure. This can improve user trust and confidence in the website.


SSL certificate wildcards can be an effective way to secure a website’s subdomains, providing cost-effective and simplified certificate management, enhanced security, and improved user experience. However, website owners should carefully consider the potential drawbacks of using SSL certificate wildcards, such as limited validation and compatibility issues. Overall, SSL certificate wildcards are a useful tool for website owners who have multiple subdomains to secure and want to streamline their SSL certificate management while ensuring the security of their visitors’ data.

It’s important to note that not all SSL certificate providers offer SSL certificate wildcards, and prices can vary depending on the provider and the level of validation required. Website owners should also be aware that SSL certificate wildcards only cover subdomains and not multiple domains, so if they have multiple domains that need to be secured, they will need to purchase individual SSL certificates for each domain.

In conclusion, SSL certificate wildcards can be an excellent way for website owners to secure their subdomains and simplify their SSL certificate management. They provide cost-effective and efficient protection for multiple subdomains and can help enhance the trust and confidence of website visitors. However, website owners should weigh the benefits and drawbacks of using SSL certificate wildcards before making a decision and ensure that they select a reputable SSL certificate provider to ensure the highest level of security for their website and its visitors.


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