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.

SE Ranking makes SEO easy!

Every tool you need under one roof

Start free trial

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.

Show more

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

Show more

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.

Show more

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.

Show more


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)


Is it possible to list all subdomains? ›

You should be able to sort your list of DNS records by 'Name' and thereby get a list of all the subdomains (subdomains will be everything that isn't @). You can also sort by 'Type' and look only at those with the CNAME type if you want to exclude TXT records and MX records.

What is the Google command to find the subdomains of a website? ›

By search engines

These operators are often referred to as Google Dorks. We can use site: operator in Google search to find all the Subdomains that Google has found for a Domain. Lets take an example on “”.

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

What search phrase can be used to find subdomains of a website? ›

How to Find the Subdomains of a Domain
  • WhoisXML Subdomain Lookup – Best for Developers.
  • Criminal IP – Best for Domain Scoring.
  • DNSDumpster – Best for Visualizing Subdomains.
  • NMMapper – Best for Simple Online Lookups.
  • Sublist3r – Best for Python Users.
  • Netcraft – Best for Historical Subdomain Data.
Jun 26, 2024

Are subdomains bad for SEO? ›

As long as you use them correctly, subdomains are fine for your SEO performance.

How many subdomains is too many? ›

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.

How do I find all the subsites of a website? ›

You can usually locate it in the root or footer section of the website. For example, the XML sitemap URL could be ““. Once you click on the sitemap, you will find all pages & subpages of a website. You can use different sitemap generation tools if you don't have an existing sitemap.

Do subdomains show up on Google search? ›

The short answer is yes, Google can and will index and rank subdomains unless you explicitly take steps to ensure they're excluded from its index. Google's entire business model is based on discovering content. The same goes for all search engines.

How to find the subdomain of a website online? ›

Online subdomain finder, discovery and research tools to collect and gather DNS information about hosts
  1. Knockpy.
  2. Sublist3r.
  3. DNSscan(Realtime)
  4. Anubis enumeration.
  5. Amass.
  6. Nmap(dns-brute.nse)
  7. Lepus.
  8. Censys finder.

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 does subdomain finder work? ›

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)

Which subdomain is historically the most used? ›

Default subdomain www is used by 39.7% of all the websites.

Is it possible to find subdomains? ›

If you're looking for domain checker tools that are free to use, you can try our Subdomain Finder for free with the Light scan version. This searches DNS records (NS, MX, TXT, AXFR) and performs subdomain enumeration using a built-in wordlist.

Does Google Search Console include subdomains? ›

Domain properties show data for all URLs under the domain name, including all protocols, subdomains, and paths. They give you a complete view of your website across Search Console, reducing the need to manually combine data.

How do I find subdomains of a domain using NsLookup? ›

Find Subdomains of a Domain with NsLookup:

Replace “” with the domain name you are interested in. This command will return a list of the authoritative name servers for the domain, which can often include the subdomains.

How do I find the DNS record of all subdomains? ›

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.

How many subdomain levels are allowed? ›

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.

How many subdomains deep can you go? ›

DNS subdomain limits

Each label (or subdomain block) can contain between 2 and 63 characters, with a limit of 127 DNS subdomains.

How to list all DNS records in nslookup? ›

Using nslookup online is very simple. Enter a domain name in the search bar above and hit 'enter'. This will take you to an overview of DNS records for the domain name you specified.


Top Articles
Latest Posts
Article information

Author: Dan Stracke

Last Updated:

Views: 5762

Rating: 4.2 / 5 (43 voted)

Reviews: 82% of readers found this page helpful

Author information

Name: Dan Stracke

Birthday: 1992-08-25

Address: 2253 Brown Springs, East Alla, OH 38634-0309

Phone: +398735162064

Job: Investor Government Associate

Hobby: Shopping, LARPing, Scrapbooking, Surfing, Slacklining, Dance, Glassblowing

Introduction: My name is Dan Stracke, I am a homely, gleaming, glamorous, inquisitive, homely, gorgeous, light person who loves writing and wants to share my knowledge and understanding with you.