Why is it important to know how to find all subdomains of a domain? As your business grows, there will be occasions when you have multiple web application setups on various subdomains. Having too many subdomains is not the problem. However, you should have complete information about how and why they are created. Also, any subdomains in the background used for developing particular applications need to be monitored frequently to avoid hackers using them for spamming.
Subdomains lying in the background would severely risk the online business. Hackers from all around the world choose them as their entry point to the website. These doorway pages can be hacked using simple tricks. It will help if you protect your assets by having a close eye on each page developed for testing purposes.
A large enterprise with multiple subdomains created over time would have difficulty finding them manually. The good news is several tools available online that make the job easy. You will have a detailed list of your website’s subdomains when you use these tools. In the following, we will discuss how to know the subdomain of a domain utilizing some best tools that run seamlessly.
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7 Best Subdomain Finder Websites
1) DNS Dumpster
DNS Dumpster is a subdomains finder tool developed to provide hosting information of the domain name. It doesn’t only find subdomains of a domain, but you can also check all vital information such as find subdomain IP address, hosting location, server details, NS records, MX records, TXT records, and etc.
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2) Spyse
Spyse subdomain finder is one of the best tools that provides research reports using the search engine. You can easily find all subdomains for a domain using the tool with the free search option.
3) Nmmapper
Nmmapper is one of the popular subdomains lookup tools that offer a comprehensive report of the domain name. Get the information about Anubix, Amass, DNScan, and Lepus using this tool.
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4) Sublist3r
Get all subdomains of a domain with the help of Sublist3r . It is developed using the popular Python programming language. Sublist3r supports major search engines such as Google, Yahoo, Bing, Ask, etc to collect the information. However, it may require technical knowledge to install and set up the application on your desktop computer. Once it is set up, it runs seamlessly.
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5) ImmuniWeb
Now find any subdomain using the ImmuniWeb domain subdomain lookup online tool. It offers SSL scan features for the security search. Submit the URL in the search box, and the application will check all subdomains of a domain and provide you with a comprehensive report in a few seconds.
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6) Netcraft
Netcraft subdomain online scanner is known for its extended domain database that provides instant results to the users about the domain name. Search any number of the domain to find the publically listed information of its subdomains.
This tool provides information about the main domain, subdomains, first seen date, netblock, and OS information. For a comprehensive report, click on the site report, where you will find additional details of the servers and other vital information.
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7) CloudPiercer
CloudPiercer is an advanced website subdomain finder online tool available that provides free service to users. Find if the subdomain exists on your website. You can track other important information such as the origin of IP, exposed information, and server information to identify the loopholes in the server.
IP exposed to the hacker would create vulnerability on the server. Hackers can use the exposed IP for DDoS attacks. Use the CloudPiercer tools to detect the exposed data and available subdomain in the background to block them from hackers.
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How Subdomain Scanners Work?
If you are looking for a quick and effective method to find subdomains of a website, you should think about using a subdomain scanner. The subdomain scanner will allow you to explore the entire domain infrastructure of any website that you can find on the internet. Before you start using such a subdomain scanner¸, it is worthy of understanding how a subdomain scanner works as well. Here are the main functionalities you can usually find inside a subdomain scanner.
- Querying Through Search Engines
Querying search engines is the most effective method available to locate subdomains. This is where a subdomain scanner would look at the Google hacking techniques. Along with the help of this method, you can effectively find the subdomains associated with any domain name.
To discover the subdomains, you must enter a simple command as “site: example.com -www.” However, the output will only provide the subdomains indexed in Google. The results you get from this method would be obtained from the latest Googlebot crawl. This method is helpful when discovering the subdomains that are not protected from the robots.txt configuration. On the other hand, you will be able to use this to locate subdomains that don’t use the “no index” meta tags.
- Brute Force Discovery
Some of the subdomain scanners you use would execute the brute force method to locate subdomains. When you use such a tool, you will be provided with a list of subdomains. You will often notice how that subdomain is associated with word lists. Hence, you will have to take your time and start testing them. Then you can decide whether the subdomains are live or not. This is a time-consuming process that you can follow to locate the subdomains.
- Running DNS Zone Transfers
DNS zone transfers are an effective method to replicate a remotely located DNS zone. Along with that, you will be able to discover all the subdomains configured under the DNS server. However, you will only be able to get positive results out of this method when the DNS zone is not limited or protected by the system administrators for incoming AXFR requests. Even though most DNS servers have that configuration, you can still give this method a try and see.
- Collecting SSL/TlS Public Information
The SSL and TLS certificates are not just used to encrypt data transferred between web browsers and servers. You can think about using them for infosec research as well. This is where you should look at the Subject Alternate Name or SAN of the SSL/TLS certificates. Then you can effectively extract both domain names as well as subdomain names. You may combine this method along with bash or python scripting as well. Then you can quickly locate the subdomains that you want to discover.
Why You Should Use Subdomain Scanner Tools?
These subdomain search tools can perform as a lifesaver in the case of hacking. Any vulnerability to the business is harmful to its growth. Hackers generally attack weak websites that expose crucial information online. It is an easy target for them as they do not have to penetrate the secure firewall server. The subdomain makes the entire website unrestricted for entrance. Your website details, such as credit card information and customer information, can be stolen using the exposed subdomain. Therefore, you should track every subdomain available on the website.
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Either you use online subdomain finder tools to identify the ones incubating in the background, or if you have access to your web hosting, go to the subdomain section and scan the website for subdomains.
The ultimate goal to find a subdomain from domain is to secure your website from hacking. The owner of the website must know what is happening on their website. If there is any exposed data on the subdomain, it will catch the attention of the hackers. Even the auto bots run by several search engines would scan this information and make it public on the web. Anyone searching the person’s name would see the exposed personal information such as phone number, email ID, credit card details, password, etc.
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It will be a disaster for a company if they reveal the personal details of their customers on the web. So it is crucial to take action to avoid unforeseen events happening on your website. The database should be stored securely without any vulnerability from the subdomain. Even if you create a subdomain, make them hidden or password protected. If you want to make it live for indexing or browser access, ensure that it is properly configured and no one would have access to the core files on the server.
Using sub-domain finder tools makes the searching process easier. Tools are comfortable to use and provide in-depth information about your website. Additional data presented by them would help you take further actions to protect your assets. These tools are free and do not require signing up to access their services. You can instantly browse their features and search for the required domain information online.
The aforementioned best subdomain finder tools work seamlessly without needing a prior setting. They will be a lifesaver if you use them correctly. Let your development team know that they should frequently use these tools to identify if any subdomain appears in the background.
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Final Words
This article has explained how to discover all subdomains of a domain. Use the best subdomain scanner online tools and discovery methods frequently and safeguard your assets. As we discussed earlier, subdomains make your website unrestricted for entrance, so essential details, such as credit card information and personal customer details, can be stolen using the exposed subdomain. Therefore, you must always be aware of the existing subdomains to protect your website from hacking.