Wildcard domains enable you to map all subdomains of a certain domain to the same place. Wildcard domains have an asterisk (*) character in the leftmost position in the domain name. For example, you might choose to map
*.barracuda.com to the same application. That means users accessing
a872kdjf9.barracuda.com, and any other subdomain of
barracuda.com are all sent to the same application server.
Uses of Wildcard Domains
Wildcard domains have a variety of uses.
You can use a wildcard domain to:
- Provide “vanity” subdomains to your users. When a user creates their username, you can allow them to access their part of your application using
<their_username>.<your_domain>.com. For example,
statuspage.ioenables companies to have their own addresses on their domain. You can reach Barracuda's specific status page at to
- Capture users who mistype or guess a subdomain and send them to the right place. For example, if a user misspells a domain name, like
emailsecccurity.barracuda.com, they are directed to Barracuda’s page on email security solutions.
- Provision new subdomains rapidly without requiring any new configuration.
Wildcard Domains and Barracuda WAF-as-a-Service
Barracuda WAF-as-a-Service supports wildcard domains, with the following considerations:
- Barracuda WAF-as-a-Service cannot automatically generate or renew a certificate for a wildcard domain. You must upload your own certificate.
- Barracuda WAF-as-a-Service cannot monitor the DNS status of your wildcard domain. In Barracuda WAF-as-a-Service, the status displayed on the Applications page and Event Log will only reflect the status of one of your single subdomains. This only affects the displayed status and health checks; it does not affect any of your application traffic.
To use a wildcard domain with Barracuda WAF-as-a-Service:
- Log into Barracuda WAF-as-a-Service and create an application as usual, as described in Getting Started.
When you are prompted for the domain name(s) for your application, enter one of the subdomains under your wildcard domain. For example, if you are setting up
*.example.com, you can enter
blog.example.com. The domain you enter here will only affect the DNS status displayed on the Barracuda WAF-as-a-Service Applications page and health checks. It will not be used for any other purpose.
- After you create the application, upload your own certificate. Follow the instructions in the If You Cannot Change Your DNS A Records section of Understanding Automatic Certificates.