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Wildcard Certificate

Definition of Wildcard Certificate

A Wildcard certificate is a type of SSL/TLS certificate that is designed to secure a domain and its subdomains with a single certificate. It is denoted by an asterisk () as the subdomain part of the domain name, allowing it to secure unlimited subdomains of a specified domain. For instance, a Wildcard certificate issued for "" would cover "", "", "", and any other subdomain under "".

Origin of Wildcard Certificate

Wildcard certificates emerged as a solution to simplify the process of securing multiple subdomains under a single domain. Prior to their introduction, organizations had to manage and purchase individual certificates for each subdomain, which was cumbersome and expensive. The concept of Wildcard certificates was introduced to streamline this process and provide a cost-effective solution for securing diverse subdomains under one umbrella certificate.

Practical Application of Wildcard Certificate

One practical application of a Wildcard certificate is in e-commerce websites. Consider an online retail store with multiple departments such as electronics, clothing, and accessories, each with its own subdomain (,, By deploying a Wildcard certificate for "*", the entire website along with its various departments can be secured efficiently under a single certificate, ensuring a seamless and secure shopping experience for customers across all sections of the website.

Benefits of Wildcard Certificate

Cost-Efficiency: With a Wildcard certificate, organizations can save costs associated with purchasing and managing individual certificates for each subdomain.

Simplified Management: Managing a single certificate for multiple subdomains is much simpler and more convenient than managing multiple certificates separately.

Scalability: As businesses grow and expand their online presence with additional subdomains, a Wildcard certificate can easily scale to accommodate new subdomains without the need for additional certificates.

Enhanced Security: By ensuring all subdomains are secured under a single certificate, a Wildcard certificate helps maintain a consistent level of security across the entire domain hierarchy, reducing the risk of security vulnerabilities.


While a regular SSL certificate is issued for a specific domain name (e.g.,, a Wildcard certificate is designed to secure the main domain and all its subdomains with a single certificate (e.g., * This makes Wildcard certificates more versatile and cost-effective for organizations managing multiple subdomains.

Yes, a Wildcard certificate can secure an unlimited number of subdomains under the specified domain. However, it's important to note that it only secures subdomains at one level deep. For example, a Wildcard certificate for "*" would secure "", "", but not "".

One limitation of Wildcard certificates is that they cannot secure subdomains at multiple levels deep. Additionally, some Certificate Authorities (CAs) may charge higher fees for Wildcard certificates compared to regular SSL certificates. It's also worth noting that Wildcard certificates may not be suitable for all use cases, particularly those requiring extended validation (EV) certificates for stringent security requirements.


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