Free Subdomain Finder: Find all Subdomains of a Website (2024)

Free SEO tools / Subdomain Finder

Find all subdomains in one click for free and get comprehensive data on their traffic and keywords

Get accurate data on traffic and keywords of any subdomain

Free Subdomain Finder: Find all Subdomains of a Website (1)

  • Free Subdomain Finder: Find all Subdomains of a Website (2)
  • Free Subdomain Finder: Find all Subdomains of a Website (3)
  • Free Subdomain Finder: Find all Subdomains of a Website (4)
  • Free Subdomain Finder: Find all Subdomains of a Website (5)



What you will see in the report

Total traffic

Total traffic cost

Keywords total



Traffic share

The tool shows the percentage of traffic a subdomain brings to the analyzed website. This metric demonstrates the traffic share for the selected location and period.

Total traffic

The tool shows the subdomain's organic traffic volume. SE Ranking calculates the expected click-through rate, search volume, and current keyword rankings to estimate this value.

Total traffic cost

This metric indicates the estimated cost of organic traffic a subdomain gets by targeting all discovered keywords. The tool displays cost in the equivalent of Google Ads prices.

Keywords total

The total number of keywords a subdomain ranks for in its organic search. Click through to get more data on each keyword: traffic, difficulty, search volume, competition and SERP features.


Analyze subdomain performance across any location. Select any of the 190 countries to access country-level data.


Get comprehensive research reports for the selected month. Access historical data to get detailed information for any past month going back to February 2020.

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Why you need a subdomain finder

Keeping tabs on subdomains is essential for any site optimization. Search engines consider each subdomain a different site, so you need to optimize each separately to boost overall traffic and improve website performance. A subdomain scanner also helps find duplicate content, which can damage rankings of both the main domain and subdomain. It also helps identify poor-quality backlinks to subdomains that can diminish your SEO efforts.

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How our subdomain finder works

Subdomain Finder scans the DNS records and supplementary databases to analyze the domain's hierarchy. Our subdomain scanner checks:

  • DNS records (NS, MX, TXT, AXFR)
  • DNS enumeration
  • SSL certificates
  • HTML links
  • Search engine results
  • Reverse DNS for target IP addresses

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How to use our subdomain scanner

Subdomain Finder is straightforward to use. To start, enter the target domain address and click Scan. The tool will take you to Subdomains section of SE Ranking’s Competitive Research, which reveals comprehensive, up-to-date data on every found subdomain—access data on traffic volume, share, and cost, along with the number of keywords. Filter subdomains by any metrics and access the detailed keywords report by clicking on the number of keywords. Finally, click the Export button to download the report in the .csv or .xsl format.

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How reliable is our subdomain checker

Subdomain scanner ensures the highest accuracy of results. It aggregates relevant information from search engines and supplementary databases and sends additional requests to domain service providers to get the most complete and up-to-date results. The scanner is secure; we don’t save or publish any information about checked domains and their subdomains.

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How to find subdomains?

There are several ways to find subdomains:

  • Manually, by using the site:* operator in Google
  • By checking DNS records using the nslookup command
  • By using our online subdomain scanner or similar tools

How to check a subdomain’s DNS records?

You can find DNS records using the nslookup command in the command line. It shows all DNS records for a given domain, including a list of subdomains. The command works for Windows, Linux, and macOS operating systems.

How are subdomains displayed on Google?

The subdomain is displayed as a separate search result. Most search engines, including Google, consider subdomains as separate sites—they crawl, index, and rank them independently from the main site. Therefore, optimising the main domain and its subdomains is equally essential.

Can subdomains be hidden?

Yes, subdomains can be hidden. There are several ways to do this:

  • Hide it from crawlers using the disallow directive in the robots.txt file
  • Hide it from indexing—use the noindex or none directive in the robots meta tag in the HTML code of the page
  • Set the X-Robots-Tag HTTP headers to noindex or none on the subdomain server

Can subdomains be hidden from scanning tools?

It is impossible to hide a subdomain from scanning completely. Subdomain checkers use publicly available DNS registers to find information. But even if the scanner has detected a subdomain, it does not necessarily mean that the page is publicly accessible—its content can be hidden.

Can a subdomain be taken over?

Subdomain takeover happens when a subdomain points to a non-active external service, but the CNAME used for that service is still in the DNS records. Hackers can set up a virtual host for the subdomain and gain control over it.

Is a subdomain a separate site?

SEO-wise, subdomains are separate sites. They are associated with the domain name but not with the site itself. Subdomains are used for different tasks:

  • site localization for various regions
  • separating categories of goods, services, or information
  • publication of user-generated content
  • separate render of the site application
  • testing new site elements

Is WWW a subdomain?

Technically, yes. You can find it among other subdomains in the search results, but it often redirects to the main domain. When the Internet was first created, the www. prefix was used to distinguish sites that use the Internet protocol. Today, some hosting providers automatically create the WWW subdomain for all sites and set up a redirect.

How many subdomains can a domain have?

Theoretically, there is no limit to the number of subdomains, but some DNS servers set restrictions. For example, GoDaddy limits users to 500 subdomains.

Why 1,000,000+ users joined SE Ranking

Large databases

Analyze data on over 3 billion keywords across 68 countries, plus we are constantly expanding our list of available databases.

Add your keywords

If you work in a narrow niche and we do not have data on your search queries, just upload them manually and the service will collect all the relevant information.

Export any reports

SE Ranking doesn’t have a limit on exporting data. You can export every available report for further analysis.

Flexible pricing

You determine the price yourself by choosing the number of keywords to track and how often you want to check their ranking positions. You can pay only for the tools you actually use.

Get help at any stage

After signing up to the service, you will be contacted by a manager who will help you figure out how to work the platform and how it can benefit your project.

Lots of educational material

We offer a YouTube channel, a blog, webinars, as well as a Help Center with plenty of how-to articles and videos. We are always busy creating new formats to make it easier and quicker for you to learn SEO.

Convenient mobile ap

You can easily control your SEO strategy right from your phone. And if something doesn’t go according to plan, you will get notified.

Ability to shape the platform according to your needs

See something that doesn’t make sense, isn’t working or is missing from the platform? Just reach out to us and we’ll see what we can do.


Use the API to manage large or complex accounts more effectively. Automatically create, customize or delete projects.

Free Subdomain Finder: Find all Subdomains of a Website (2024)


How do I see all subdomains of a website? ›

There are several ways to find subdomains:
  1. Manually, by using the site:* operator in Google.
  2. By checking DNS records using the nslookup command.
  3. By using our online subdomain scanner or similar tools.

What is the best tool to find subdomains? ›

Here are ten highly effective options.
  • Google Dorking. Google Dorking is a passive subdomain enumeration technique using Google's advanced search operators, like "site:" to find information about a target, including subdomains. ...
  • Sublist3r. ...
  • Amass. ...
  • Recon-ng. ...
  • SubDomainizer. ...
  • Pentest Tools Subdomain Finder. ...
  • ...
  • Shodan.
May 13, 2024

Which website provide information about subdomains? ›

NMMAPPER. An online tool to find subdomains using Anubis, Amass, DNScan, Sublist3r, Lepus, Censys, etc.

Does Google see subdomains as separate sites? ›

Google treats subdomains as distinct websites. Which means they crawl and index subdomains separately.

Does Google show subdomains? ›

However, Google treats subdomains as separate sites.

While “” and “” may share a root domain, Googlebot will view them as distinct domains and crawl and index them accordingly.

What is a subfinder? ›

subfinder is a subdomain enumeration tool written in the Go programming language. Subfinder is used for discovering passive subdomains of websites by using digital sources like Censys, Chaos, Recon. dev, Shodan, Spyse, Virustotal, and many other passive online sources.

How do I view subdomains in Google Analytics? ›

Go to GA4 admin > Data Streams > Select your web data stream > Configure Tag Settings > Show More > List unwanted referrals and then enter your main domain there. For example, if your subdomains are and, then enter in the settings of GA4. Save the changes.

How does Sublist3r work? ›

Sublist3r is a python tool designed to enumerate subdomains of websites using OSINT. It helps penetration testers and bug hunters collect and gather subdomains for the domain they are targeting. Sublist3r enumerates subdomains using many search engines such as Google, Yahoo, Bing, Baidu and Ask.

How do I find all DNS records for a domain and subdomain? ›

Using a terminal and the command nslookup is the most effective way to search a domain's DNS records. On almost all operating systems, this command works perfectly and displays all DNS records for the domain. To show how to use the command, here's a sample nslookup command for each record type.

Are subdomains separate websites? ›

Subdomains create a separate identity, and provide an opportunity to create a unique website within a website. For example, Google Docs and Google Ads are unique products. A subdomain lets Google use a different design and content structure to create a clear distinction between them (and other products).

Where are subdomains located? ›

A subdomain, on the other hand, is another part of the URL structure that goes before the domain name. As its main purpose is for site organization, your website can work fine without it.

How to get a free subdomain? ›

To use or change a free subdomain:
  1. From your Square Online Overview page, go to Website > Domains.
  2. Select Connect domain.
  3. Select Use a Square subdomain and enter your preferred subdomain name (like "mybusiness. ...
  4. Select Change when finished.
  5. Publish your site in the Square Online site editor to see your changes live.

What is the difference between a subdomain and a sub domain? ›

A subdomain compartmentalizes your website so you can establish specific content types that are distinct from your root domain. On the other hand, a subdirectory is a pathway within your site. Subdirectories are a level within the domain's hierarchy. Subdirectories branch off from the subdomain they belong to.

How many sub subdomains can a domain have? ›

Characteristics and Parameters of a Subdomain

A domain can have up to 500 subdomains. You can create multiple levels of subdomains such as,, etc. Each subdomain can be up to 255 characters long, but for multi level subdomains, each level can only be 63 characters long.

Where is the subdomain in a URL? ›

Subdomains are the part of a domain that comes before the main domain name and domain extension. They can help you organize your website. For example, . In this URL, docs is the subdomain.

How many subdomains can a website have? ›

Each domain name can have up to 500 subdomains. You can also add multiple levels of subdomains, such as A subdomain can be up to 255 characters long, but if you have multiple levels in your subdomain, each level can only be 63 characters long.


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