Domain Finder
Fast, accurate and free online domain finder tool running directly in your browser.
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3Get the result
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Domain Finder
Find domains related to a domain, IP address, or organization name. The tool combines DNS, basic WHOIS, and Certificate Transparency logs (crt.sh). Use it only to analyze your own or authorized resources.
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Domain Finder is a convenient online tool that, based on one input value of a domain, IP address or organization name, can find related domains, arrange them in a clear table and show from what sources they were detected, so instead of manually checking subsequent addresses, you can in a few moments see a broader picture of your network infrastructure and organize it better. After entering a domain or IP, the tool automatically recognizes the type of input, can access Certificate Transparency logs and WHOIS databases, and uses DNS, reverse DNS and basic network information to list related domains that are worth knowing and controlling.
This domain finder was designed as a utility tool, not as a complicated scanner, so the entire operation comes down to entering the input value in one field, select whether you want to use CT logs and WHOIS analysis, set the maximum number of results and click the search for related domains button, then basic information and a table of active results immediately appear in the lower part. Thanks to this, you can use Domain Finder to organize your company's domains, review addresses associated with a specific network, or simply to better understand what domains are publicly visible as part of your online presence and in what context they appear in logs and external databases.
What exactly does Domain Finder do and what data can it analyze
Unlike simple tools that check only one domain, Domain Finder can work with three types of input and then compiles the found information in one place, so you don't have to manually combine data from many websites and panels.
What values can you enter in the Domain Finder
- Domainfor example
yourdomain.plorexample.comwhen you want to see other domains that may be associated with it via certificates or network configuration. - IP addressif you are interested in domains pointing to a specific server and want to check what names are resolved to this address by DNS.
- The name of the organization or the phrasethat appears in WHOIS registers, which allows you to find domains registered to a given company or institution, if such data is publicly available.
The tool automatically recognizes the input type, as you can see later in the basic information section in the input type line, so you don't have to manually indicate whether you're entering a domain, IP, or organization name.
What sources does the Domain Finder use
- Certificate Transparency Logs (crt.sh)if you enable the search for domains in CT logs switch, the tool will check the certificates associated with the domain, IP or organization name.
- WHOIS datawhen you activate the analyze WHOIS data option, Domain Finder will try to read the organization name, network name and ASN number, if they are available and have not been hidden.
- DNS and reverse DNSbasic DNS queries allow you to discover domains and hostnames associated with an IP address or verify that a domain correctly points to a server.
- Filters and result limityou can set the maximum number of domains in the result, so that the tool returns only the most relevant records instead of a very long list of insignificant addresses.
Everything works on the server side, and in the interface you only see the ordered result of the Domain Finder's work, without the need to manually configure external tools and without copying the results between different websites.
How to use Domain Finder step by step
The Domain Finder interface is built on a simple tool tab where everything is at hand, so the entire process of searching for related domains is closed in a few specific steps that are easy to repeat when analyzing subsequent domains, IP addresses or organizations.
- Enter the domain, IP address or organization name in the main field of the form.
This is exactly the same field that is described in the interface as a domain, IP address or organization name, so you know from the very beginning that the tool can work with several types of input data. - Decide whether you want to use CT logs and WHOIS analyses.
Below the input field you will find two switches: search for domains in the Certificate Transparency logs and analyze WHOIS data, which you can freely turn on or off if you want faster results or a more complete analysis of related domains. - Set the maximum number of results.
In the maximum number of domains in the result field, you can adjust the limit to the size of the analyzed infrastructure, which allows you to avoid data overload for very large organizations and at the same time maintain the completeness of the results for smaller projects. - Click the search for related domains button and wait for the result.
After running the search, Domain Finder processes the data and then displays a basic information section and a related domains table at the bottom of the tab, where each domain found is immediately linked, so you can open it in a new tab with one click.
How to read the basic information section in Domain Finder
Before you go to the results table, it is worth taking a look at the basic information block, which appears above the list of domains and helps you quickly understand what you are actually working with, for example whether you are analyzing a domain, IP or organization name and what data was extracted from DNS and WHOIS.
| Field in the tool | What | means How you can use it |
|---|---|---|
| Input type | Information whether the entered value was recognized as a domain, IP address, organization name or ambiguous data. | It allows you to ensure that Domain Finder correctly interprets your data and uses the appropriate analysis paths. |
| Input value | Exactly what you entered in the field at the top of the card, written in the same or standardized form. | It shows well how the tool processes data and helps avoid typos in many similar queries. |
| Resolved IP Address | The IP address that the domain being analyzed points to or that has been used as a starting point for analyzing related domains. | You can use it to check what other domains point to the same address and whether the DNS configuration is consistent. |
| Hostname (reverse DNS) | The hostname returned in the reverse DNS query, if such information is available. | Gives a quick idea of how a server identifies itself on the network and may suggest that more than one service is running at the same address. |
| Organization from WHOIS | The name of the organization read from WHOIS registries, unless the data has been hidden or anonymized. | Helps associate domains with a specific owner and facilitates manual cleaning of the brand and project structure. |
| Network name and ASN | Network information that indicates what address range the IP belongs to and who manages the network. | Useful for initial orientation in the infrastructure and when planning moves to other addresses or networks. |
How the Related Domains table works and what the result columns mean
The most important part of the Domain Finder is the Related Domains table, in which each domain is presented on a separate row, with information about the sources from which it was pulled and with additional notes, for example about the type of record or how the domain was associated with the input.
| Domain | Sources | Notes |
|---|---|---|
The full domain name clicked as a link that takes you tohttps://domainin a new tab. |
A list of source short names, for example CT, WHOIS, DNS, reverse DNS, or input if the domain was the starting point. | Additional text information that may indicate how the domain was found or how it is related to the analyzed object. |
| Rows with repeated domains are merged so that each name appears only once in the table. | If the domain was found in several sources, you will see them all, allowing you to assess whether the link is strong or marginal. | No comments are usually marked with a dash, so you can immediately see which entries contain additional comments. |
When to use Domain Finder and how to do it responsibly
Domain Finder is a tool created for analyzing your own or authorized resources, so it works best when you want to organize your domain infrastructure, gain a better idea of what domains are associated with your organization and ensure order in the network before subsequent changes or implementations.
Examples of Domain Finder applications
- Domain review before rebranding or name change to ensure no important address is missed.
- Organizing older projects when, after many years, it is difficult to remember all domains and subprojects connected to one organization.
- Initial domain overview before migrating to new infrastructure, when you want to see what addresses are associated with specific IP addresses.
- Domain analysis from an SEO and marketing level to understand what addresses may be indexed or associated with your brand.
Good Practices and Responsible Use
- Use Domain Finder primarily to analyze your own domains and resources to which you are formally authorized.
- Treat the results as a starting point for organizing your infrastructure, not as a tool for trying to interfere with other people's services.
- Please note that the availability of data in CT and WHOIS logs depends on configuration and regulations, so in some cases the result will be partial.
- Combine information from Domain Finder with your own notes and technical documentation to have a complete, up-to-date picture of projects associated with a given organization.
Frequently asked questions about Domain Finder
Is Domain Finder free and can I use it without registration
The Domain Finder tool has been prepared as a convenient, web-based service for analyzing related domains and is intended to operate in a free access model without unnecessary formalities, so you can use it without installing additional software and without going through the long process of setting up an account, unless other rules have been introduced at the level of the entire website.
What are the limitations of the results and why can't I see all the domains
Domain Finder works on publicly available data from the Certificate Transparency, WHOIS and DNS logs, so if the data is hidden, anonymized or does not appear in the CT logs, some domains will not appear in the results, which is normal and results from the privacy policies and the configuration of individual registries and services.
Does Domain Finder register or change domains itself
No, the tool is informative and is only used to search and present related domains, while the registration, transfer or deletion of domains always takes place with the selected registrar or operator, which allows you to maintain full control on your side.
Are Domain Finder results suitable as the only source of data about domains
The results of this type of tool should be treated as a valuable supplement to technical documentation, data from the registrar panel and internal project lists, because Domain Finder shows what is visible from the perspective of the network and public registries, and not everything that is described in your internal systems.
Can I save a list of domains found by Domain Finder
After performing the search, you can manually copy the list of domains or use your browser's mechanisms to save the page, and then paste the data into a spreadsheet, document or system where you manage projects on a daily basis, making further cleaning and planning changes easier.
Need a complete list of related domains for your organization? Do it with one search in Domain Finder
Instead of guessing what domains are still attached to your IP address, network or organization, use Domain Finder, enter one value and see ordered results from CT, WHOIS and DNS logs, thanks to which you can plan infrastructure clean-up, website migration or brand rebranding faster without worrying that you will miss an important address.
Launch Domain Finder and check your domains