Subdomain Finder
Fast, accurate and free online subdomain finder tool running directly in your browser.
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3Get the result
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Subdomain Finder
Find subdomains associated with a given domain using passive wordlist DNS fuzzing. The tool is only used to test the security of websites to which you have permission.
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Related tools
Other tools you may find usefulSubdomain Finder - quick search for subdomains for a selected domain
Subdomain Finder is an easy-to-use online tool that can find subdomains related to it based on one domain, check their HTTP response and arrange everything in a clear table, thanks to which in a few moments you will see a more complete picture of your website, store or application on the Internet, without manually guessing subsequent addresses such aspanel.domena.plordev.domena.pl. You enter the domain in one field, decide whether to use the built-in list of popular subdomains and your own wordlist, set the maximum number of tested addresses and start the search with one click, and after a short while you get a ready list of subdomains with information about the IP and HTTP status for these names.
The Subdomain Finder tool was created to help an ordinary user, administrator or for a person who cares about the security of their services, to make life easier when organizing domains and planning changes, and not to encourage attacking other people's websites, so always use it only on websites, domains and services to which you have full rights or official permission to test. Thanks to the clear interface in the form of a compact card, you do not have to read documentation or learn difficult commands, because the entire logic is reduced to a few switches, a text field for the domain and possibly a simple textarea for your own list of subdomain prefixes, which you can paste from a file or notes.
What is Subdomain Finder and when should you use it
Subdomain Finder is a subdomain enumerator tool that performs a series of DNS queries for combinations of the root domain and various prefixes, so it can detect addresses such aswww, api, panel, dev, test, static, cdnand any others you add to your wordlist, then displays only those subdomains that actually exist and return records with IP addresses. This solution is always useful when you want to have a more complete picture of your infrastructure, check which subdomains are still active after years of project development, verify which addresses user traffic is directed to or simply prepare for cleaning, migration or website security tests, of course within the limits of the law and with the consent of the owner.
Highlights Subdomain Finder
- Automatic search for subdomains based on a built-in list of popular prefixes, such as
www,mail,api,dev,panel,cdn,shopand many others. - Support for your own wordlist, i.e. a list of subdomain prefixes entered line by line, which allows you to test exactly the names that match the realities of your project and industry.
- Possibility to set the maximum number of tested subdomains, so you have control over how broadly the search should be performed.
- Optional checking of HTTP responses (HEAD to path
/) for detected subdomains to immediately see which addresses provide a reasonable response and are actually available in the browser.
For whom this tool was created
- For website and store owners who want to know under which subdomains their website is publicly visible and which addresses are worth organizing.
- For administrators and webmasters who take over a project from someone else and need a quick overview of subdomains so as not to miss anything when cleaning the infrastructure.
- For people responsible for the security of their systems who want to make sure that they have not forgotten old, test or outdated subdomains visible from the Internet, of course as part of legal tests on their own resources.
- For technical users and the curious who want to better understand how their project is spread across different subdomains, without having to install anything on their computer.
What the Subdomain Finder interface looks like and what fields you will see in the form
The Subdomain Finder interface is organized in the form of a clear tab, in which you first see the title and a short description of the tool, and below it a simple form with input fields and switches that allow you to adjust the way you search for subdomains to a specific scenario, without looking inside the server configuration or DNS zone files.
Key fields and switches
- Domain (e.g. example.com)- the main field where you enter the domain for which you want to find subdomains, without the prefix
http://and without additional paths. - Use the built-in list of popular subdomains- a switch that allows you to enable or disable a ready-made set of prefixes such as
www,mail,api,dev,panel,cdn,shop, which the tool will automatically test. - Your own list of subdomains- a text field where you can paste or enter your prefixes, one per line, without the main domain, for example
admin,client,partners, which gives great flexibility and adaptation to the specificity of the project. - Maximum number of tested subdomains- a numeric field that allows you to decide how many domain plus prefix combinations should be checked, which allows for better control over the scope of operation.
- Check HTTP response for found subdomains- a switch that, when enabled, adds an additional step to the process in the form of a HEAD query for each detected subdomain, so that the HTTP status appears in the results, indicating whether any web application is actually running at a given address.
Tips before running a search
- Make sure the domain is entered correctly, without a protocol, for example
mojasklep.plinstead ofhttps://mojasklep.pl, because Subdomain Finder verifies the validity of the domain and reports an error in case of an error. - If you are planning a wide enumeration, start with the built-in list of popular subdomains and only then add your own prefixes so as not to test too many meaningless names at once.
- Please note that the tool uses the DNS and cURL functions available on the server, so if there is no support for
dns_get_record()or the cURL extension, some functions (for example HTTP checking) may be omitted and you will see a clear message about this. - Use Subdomain Finder only on your domains and on websites that expressly allow such tests, treating the tool as an aid in organizing your infrastructure and improving the security of your own services.
How Subdomain Finder presents found subdomains in the results
After clicking the search for subdomains button and completing the enumeration process, Subdomain Finder displays the results section with the heading subdomains found, in which you will see a table with several well-labeled columns, such as subdomain, IP addresses, HTTP and notes, which allows you to quickly find out which addresses are active, how they respond and what you can do with them expect.
| Column | What | shows How it can be used |
|---|---|---|
| Subdomain | The full name of the subdomain in the format, for exampleapi.yourdomain.pl, usually presented as a link that opens in a new tab. |
You can click on the subdomain to check what the website looks like in the browser, whether the panel is secured with login and whether an old version of the application that you have long forgotten about is running there. |
| IP Addresses | A list of IP addresses that a given subdomain resolves to by DNS, which often points to a specific server or hosting service. | By comparing IPs for different subdomains, you can quickly see which addresses are shared, which ones are about to go to new servers, and where old test or archive environments potentially hang. |
| HTTP | Information about the HTTP status for the subdomain, for example200, 301, 302, 403, 404, or a note that HTTP checking has been bypassed. |
This allows you to quickly sift out subdomains that do not respond or return an error from those that actually serve some content and require attention during clean-up, migration or security testing. |
| Notes | Additional text description related to the subdomain, such as how it was detected or what unusual behavior was observed in the HTTP response. | You can use the note field as a reference point for further analysis, documentation, or planning actions such as redirects or exclusions of unused subdomains. |
Examples of using Subdomain Finder in everyday work
Even if you don't deal with security professionally on a daily basis, Subdomain Finder can become your constant helper when organizing domains, planning migrations and making sure that old environments that no one updates anymore are not publicly available and are still visible on the network and may mislead users.
When you own a website or store
- Every once in a while, you run the Subdomain Finder for your domain to check whether old test subdomains, such as
betaorstaging, which should have been disabled long ago, are still running. - Before you start rebranding or changing your main domain, you generate a list of subdomains to schedule redirects, update links in campaigns, and make sure users go to the right place.
- You can better understand how your website was once separated into different subdomains, which helps when planning clean-up, centralization or separation of separate application modules.
When dealing with administration or security
- When taking over a new project from another team, Subdomain Finder allows you to quickly map public subdomains associated with the main domain, so as not to rely solely on sparse documentation.
- You can initially identify forgotten panels, old versions of administration panels or unused web applications that still return 200 codes or redirects and require a decision on what to do next.
- Before a formal audit or security tests on your own systems, you can use Subdomain Finder to prepare a base list of objectives, which you will later use in a controlled way in audit tools, maintaining full compliance with the company's authorizations and policies.
Frequently asked questions about Subdomain Finder
Is Subdomain Finder free and works without installation
Subdomain Finder works as a web tool, run directly in the browser, so you don't have to install anything on your computer, and in the standard variant it is available as a free feature within the website that provides this tool, which allows you to quickly check subdomains whenever you need to.
Can I use Subdomain Finder to test the security of any websites
The tool was created for legal security tests and organizing your own infrastructure, so use it only on domains and websites to which you have the rights or explicit consent to perform tests, and in doubtful cases, always consult the website owner or the legal department to maintain full compliance with the regulations and regulations.
What to do if I see an invalid domain message
If I get a message telling me to enter a valid domain, make sure you enter it without protocol and without paths, for exampleexample.cominstead ofhttps://example.com/panel, and then try again because Subdomain The Finder checks the basic correctness of the domain format before it starts enumerating subdomains.
Why can't I see HTTP results for some subdomains
If there is no support for the cURL extension on the server that supports the tool, checking the HTTP response may be omitted and then you will see appropriate information in the HTTP column, so it is worth treating this column as an additional layer of data, and not the only source of truth about what is happening at a given address.
Can I easily export Subdomain Finder results
The easiest way is to select and copy the results table directly from your browser, then paste it into a spreadsheet or document you work in every day, allowing you to quickly mark subdomains for disabling, redirection, or further monitoring.
You need a full list of subdomains for your website
Instead of manually guessing addresses likepanel.domena.pl, dev.domena.plorshop.domena.pl, run Subdomain Finder, enter your domain, turn on the built-in list of popular subdomains, add your own prefixes and in a few moments you will receive a clear list of addresses with IP and HTTP status, which will facilitate subsequent cleaning, migrations and all activities related to the security of your services.