What are Wildcard Subdomains? How to Create a Wildcard Subdomains?

What Is a Wildcard Subdomain?

A wildcard subdomain, also known as a DNS wildcard record, is a DNS record that maps an asterisk (*) representing any other name in a domain to a specified IP address. This is done through the use of an asterisk (*) as a generic input for any subdomain name.

For instance, select the wildcard subdomain record that begins with *. example. com will pull that website for any subdomain beneath example. com, such as blogs.example.com, shop.example.com

One is a top-level domain and can be referred to as com, for example, or any other subdomain that has not been specified in the DNS configuration.

This can be particularly useful when you need to manage a large number of subdomains or when you want to implement a catch-all for all the subdomains and route all the subscripts to the appropriate destination.

Also Read: What is a Wildcard SSL Certificate, and How Does It Protect Subdomains?

Wildcard Subdomains Uses

The ability to cut across the structure of domains and manage individual subdomains under the same domain is one of the key functions of wildcard subdomains.

Here are some common uses:

Catch-All Subdomains:

Wildcard subdomains can be used to redirect traffic into any unspecified or mistyped subdomains to a default page, so that users do not encounter a 404 page.

For example, if a user types xyz.example.com, that entered the URL com by accident may lead to a particular error page or the target internet site.

Dynamic Subdomains for User Accounts:

Web applications usually deploy wildcard subdomains to manage unique profiles for each user account or profile.

For example, an application may have URLs such as user1. example.com, user2.example.com, etc., without the need to configure each subdomain separately.

Multi-Tenant Applications:

Multitenant applications, which provide services to multiple customers/tenants from a single instance of software, use wildcard subdomains to provide separate tenants.

The tenant can possess its subdomain, for example, tenant1.example.com, tenant2.example.com. An instance of the app that can be accessed via the DNS name of their com account.

Load Balancing and Distribution:

Subdomain wildcards are effective in load balancing traffic across different servers or services. This can be part of a load-balancer scenario where subdomains are mapped to the appropriate back-end servers depending on the subdomain name.

Simplified DNS Management:

It could be difficult to handle DNS for several different subdomains. For this purpose, the process of administrative work is made easier using wildcard subdomains, where any request to a subdomain can be managed with a single DNS entry.

Development and Testing Environments:

Another option is to use wildcard subdomains to create throwaway or disposable subdomains for testing out features and updates in isolation.

For example, dev1. example. com, test1. example. It can be easily created and managed without additional DNS configuration for com, net ,org and so on.

Wildcard Certificates for HTTPS:

Wildcard SSL/TLS certificates can be used to secure the entire domain and its subdomains secure whenever HTTPS is used, while securing large numbers of subdomains does not require each one to be given a separate certificate.

Also Read: What is a Wildcard SAN Certificate and How Does It Work?

Wildcard Subdomain Example

If you want to point all subdomains to the same domain, the record type will be CNAME, the target name will be *, and the value will be yourdomain. com.

If you prefer to point all subdomains to a given IP address, you need to use a record of type A, name *, and the value should be the IP address, for example, 123. 123. 123. 123.

In the subsequent steps after configuring your DNS, you should make your server ready to handle these wildcard subdomains.

In Nginx, you would create a server block that listens to a port, in this case, port 80, and the server name *. yourdomain. Such as .com as the server name, directing visitors to a specific root folder.

In the case of Apache, you would create a virtual host with ServerAlias set to *. yourdomain. com and set its DocumentRoot to a directory of the server holding the desired files.

Not only servers, but the application code can also be configured to enable wildcard subdomains.

For instance, using Node, with the help of Express, you can develop middleware to parse subdomains and handle them. This entails breaking the host header to get the subdomain and then routing or doing the required set of actions, depending on the subdomain extracted from the host header.

Also Read: How to Generate a CSR for Wildcard SSL and Install a Certificate?

Functions of Subdomains

They are one of the most important control and development mechanisms of web structures and applications. It provides several crucial features and values that can promote efficiency and convenience across various contexts.

Here’s a detailed look at the functions of wildcard subdomains:

Simplified DNS Management

These types of subdomains give an administrator the facility to establish a single DNS record that will match any subdomain that a provider wishes. This proves to be very helpful in matters relating to the management of DNS records.

It is efficient as it does not require one to set up the DNS for each subdomain separately, as would be done with a * wildcard entry.

For instance, if a browser enters ‘www. example. com’ and is directed to ‘some. app. com’, the browser will send the request to some.app.com subdomain to the same IP address or server of ‘www. example. com’. This is especially useful in large-scale organizations or applications that can contain multiple subdomains.

Also Read: How to Install a Wildcard SSL Certificate on IIS 10?

Dynamic Subdomain Generation

From the analysis above, one can clearly see that wildcard subdomains are unique since it is possible to create additional subdomains online as they are needed. This is very helpful, especially when the use-case is giving subdomains based on the user.

For example, a blogging platform could implement wildcard subdomains to provide each of the users with their own area (e. g. , user1. example. com, user2. example. com). So, to build multi-tenant applications, which allow the creation of subdomains for every client without any additional DNS configuration, could be helpful to create dedicated subdomains for every client easy for effective scaling and use.

Improved Flexibility and Scalability

Because wildcard subdomains allow for the creation of new subdomains at the application level, there is no additional configuration required for each subdomain. This capability opens up the possibility for high amounts of growth and structural changes in applications.

For instance, additional subdomains may be created to accommodate the increasing traffic load, incorporating new functions, or offering more services while never adjusting the DNS. This flexibility is important where one is likely to encounter abrupt change or growth, a phenomenon common in business entities.

Centralized Content Management

Wildcard subdomains, on the other hand enables all subdomains to point to a single server or application instance. It makes content easier to manage and perpetuates the task of maintaining a healthy balance of differentiation and similarity between subdomains.

For example, it is possible to come across a situation where a particular company employed *.company.com to direct all incoming subdomain requests to a common interface for content delivery and management, often known as the content management system (CMS). This CMS can then serve content that is relevant to the exact subdomain in question in order to maintain consistency and relevancy in the experience by the user.

Also Read: What is the Difference between DNS over TLS vs DNS over HTTPS?

Enhanced User Experience

Having unique subdomains is beneficial for the users or clients by giving them a professional web segment, which belongs to them specifically.

For instance, subdomains, such as client1.service.com or client2. service. It can also develop loyalty and a sense of individualization for clients among the general populace of. This personalization can help increase user activity and satisfaction because users will have the tip of a specialized atmosphere.

How to Create a Wildcard Subdomain in Cpanel?

• Login to cPanel: To get into your cPanel interface you have to open your web browser and enter login details supplied to you by your web host.
• Locate Subdomains: After day and registering for an account, go to Domain manager or try using a search bar in the page to look for Subdomains.
• Create Subdomain: To proceed with the subdomain manipulation click on the ‘Subdomains’ button. On the Subdomains page, there would be a form which users may fill to create a new subdomain.
• Enter Details: In case of “Subdomain,” put an asterisk (*) symbol in the text box designated for this parameter. This symbol is used to make a field or column to allow searching of any character. For instance, if your domain is  ‘example.’ com”, enter “. example. com”.
• Choose Document Root: The “Document Root” field is optional and will be filled by the site builder tool. This designates the directory where files that correspond to the wildcard subdomain will be located. This determines the directory where files for the wildcard subdomain are placed. Designate the folder in which to save files as the default, or select a different one if necessary.
• Create Subdomain: To create the wildcard subdomain you would click on the Create button like I have highlighted below.
• Confirmation: Once they are created, the admin will receive a confirmation message on the screen that a wildcard subdomain has been added.

How To Create A Subdomain In CloudFlare?

• Login to Cloudflare: Visit the Cloudflare website and log in with your credentials.
• Select Domain: If you own several domains, choose the one for creating a subdomain from the dashboard.
• Navigate to DNS Settings: After getting on the domain dashboard, find the option labelled “DNS”. This is where you manage DNS records for your domain,:
• Add DNS Record: In the DNS Records section, you will see the Add Record button located at the bottom of the page.
• Enter Details: In the “Name” field, you must provide a specific company subdomain name. For instance, let us consider an example of creating a “sub.” example. To do this, simply press “tab” to go to the next field, and enter “sub” in the Name field.
• Select Type: Select the record type depending on the complexity of the inquiry and the amount of data you want to obtain. For any standard subdomain choose ‘A’ if it is an IP version 4 address or ‘CNAME’ if it is an alias.
• Enter Value: In the “IPv4 Address” or “Value” field, you need to input the IP address of the server to which the subdomain will direct. In case of using a CNAME record, specify the hostname of the target server.
• Toggle Proxy Status (Optional): To proxy traffic through Cloudflare, switch proxy status to the ‘Proxied’ state. This comes in handy to conceal your origin server IP address.
• Save Record: When you are done, click on the “Save” button to provide the DNS record of the subdomain.
• Verification: Once entered, Cloudflare will show a success message saying that the selected DNS record has been added successfully. Sometimes it may take several days before the changes reflected on the website go viral on the internet
• Test Subdomain: It is now possible to put the subdomain to the test by simply typing its address in the address bar of any web browser and checking whether it directs the connection to the right place.

Conclusion

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