How to Find All Subdomains of a Domain: Free Tools & Expert Methods

How to Find All Subdomains of a Domain with Free Online Tools

If you want to uncover every part of your website, our simple guide will show you how to find all subdomains of a domain with zero cost.

We’ll walk you through the exact steps to reveal the complete structure of your site, providing you with comprehensive oversight for better control and security.

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How to Find All Subdomains of a Domain for Free

Finding all subdomains of a domain is important for several reasons, such as website security analysis, SEO auditing, network management, and more.

Below, we present several efficient methods to identify a target domain’s subdomains.

  1. Use Google Command to Find the Subdomains of a Website

You can use the site: operator in the Google search to find all the subdomains that Google has indexed for a specific domain. To do this, simply enter the following command in the Google search bar:

Final: How to Find All Subdomains of a Domain with Free Online Tools

For the domain, you’ll get subdomains for different locations like Croatia, China, and Greece.

Replace “” with the domain you want to find the subdomains for. This will display a list of subdomains indexed by Google for the specified domain.

  1. Find Subdomains of a Domain with NsLookup:

You can use the nslookup command in the command line, which works for Windows, Linux, and MacOS. Open your terminal or command prompt and type:

Final: How to Find All Subdomains of a Domain with Free Online Tools

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.

  1. Find All Subdomains of a Domain with Online Tools:

Numerous online tools are available that can extract domain information and provide you with a list of subdomains for a given domain.

Some popular online tools include:

  • Sublist3r: A powerful subdomain enumeration tool that uses various search engines, and it can also enumerate subdomains using brute-forcing techniques.
  • DNSDumpster: A free online tool that allows you to find subdomains of a domain using DNS data.
  • Virustotal: Although primarily known for its malware scanning capabilities, Virustotal also has a feature that allows users to search for subdomains of a given domain.
  • Amass: An open-source tool for discovering subdomains. It is commonly used for network mapping and asset discovery.

These methods should help you find the subdomains of a domain for free. Make sure to use these techniques responsibly and respect the privacy and security of the targeted domain.

How to Find All Subdomains of a Target Domain in Kali Linux

Kali Linux is a Linux distribution that is specialized for cybersecurity tasks such as penetration testing, security research, computer forensics, and reverse engineering.

You can also use Kali Linux to find all subdomains of a target domain, a process often referred to as subdomain enumeration.

Subdomain enumeration is a common practice in the initial phase of penetration testing, used to gather information and map out the attack surface of a target domain name.

Kali Linux includes several tools that can perform subdomain enumeration, such as:

  • DNSRecon
  • Sublist3r
  • Amass
  • theHarvester
  • dnswalk
  • Fierce

Here’s a basic example of how you can use one of these tools, like DNSRecon, to find subdomains:

Final: How to Find All Subdomains of a Domain with Free Online Tools

Simply run this line of code in your Bash terminal

dnsrecon -d

And for Sublist3r, you would use:

Final: How to Find All Subdomains of a Domain with Free Online Tools

Simply run this line of code in your Bash terminal

sublist3r -d

These commands would initiate a search for subdomains associated with “”.


Please remember that performing subdomain enumeration on domains you do not own or have explicit permission to test is unauthorized and potentially illegal. Always ensure you have authorization before attempting to test or gather information from any system or network that is not your own.

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Best Subdomain Finder Tools to Extract DNS Records of a Target Domain

Explore these leading tools to easily find subdomains and get DNS record information for your chosen domain.


Final: How to Find All Subdomains of a Domain with Free Online Tools

NMMAPPER provides comprehensive information about a website’s subdomains and associated internet locations. It aids in understanding the website’s network structure and provides insights into its digital footprint.

  1. Sublist3r

Final: How to Find All Subdomains of a Domain with Free Online Tools

Sublist3r is a popular subdomain discovery tool among users familiar with command-line operations. By executing specific commands with the website name, Sublist3r generates a comprehensive list of subdomains, enabling efficient subdomain discovery.

  1. Netcraft

Final: How to Find All Subdomains of a Domain with Free Online Tools

Netcraft offers a wide range of services, including subdomain enumeration.

It also provides historical data about the website, its hosting location, and other relevant information useful for security analysis and monitoring.

  1. Detectify

Final: How to Find All Subdomains of a Domain with Free Online Tools

In addition to showcasing subdomains, Detectify specializes in identifying potential security issues associated with these subdomains, offering insights into the overall security posture of the target domain.

  1. SubBrute

Final: How to Find All Subdomains of a Domain with Free Online Tools

SubBrute is a command-line subdomain enumeration tool designed for thorough subdomain enumeration.

It efficiently generates an extensive list of subdomains associated with the target domain, aiding in the comprehensive understanding of its online presence.

  1. Knock

Final: How to Find All Subdomains of a Domain with Free Online Tools

Knock is a command-line subdomain discovery tool that facilitates the discovery of subdomains linked to the primary domain.

It provides crucial details about these subdomains, enabling users to gain deeper insights into the domain’s network infrastructure.

  1. DNSRecon on Kali

Final: How to Find All Subdomains of a Domain with Free Online Tools

DNSRecon is a subdomain enumeration tool included in the Kali Linux distribution, primarily focused on providing detailed insights into website infrastructure. It assists in subdomain discovery and offers comprehensive information about associated internet components.

  1. Pentest-Tools

Final: How to Find All Subdomains of a Domain with Free Online Tools

Pentest Tools is a comprehensive online platform that offers various security-related functionalities, including subdomain enumeration.

Among its many capabilities, it assists in the identification and enumeration of subdomains for a target domain, aiding in comprehensive security assessments.

  1. MassDNS

Final: How to Find All Subdomains of a Domain with Free Online Tools

MassDNS is a tool designed for bulk subdomain verification. It efficiently checks multiple domains simultaneously, providing quick insights into the subdomains associated with the target domains.

  1. OWASP Amass

Final: How to Find All Subdomains of a Domain with Free Online Tools

The Open Web Application Security Project, or OWASP, created Amass, a tool that helps find all the subdomains of a website. Amass uses data from many places, like internet searches, to do its job well and give complete results.

Final Word: Finding Subdomain Information for Free

To keep your website safe, it’s crucial to know about all its parts, including subdomains. This guide has shown you different ways and tools to find this information without spending money.

By using these strategies, you empower yourself to make informed decisions about your website’s security, performance, and management, ensuring it runs smoothly and stays safe from potential threats.

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Next Steps: What Now?

Learn More About Subdomains

Frequently Asked Questions

Is there a way to find all subdomains of a domain?

Yes, there are several methods and tools available to find all subdomains associated with a domain name. You can use Subdomain Finders, Subdomain Scanners, or Subdomain Enumeration tools to achieve this.

What is the significance of DNS records in subdomain discovery?

DNS records play a crucial role in identifying subdomains. By examining DNS records, you can uncover information about the subdomains, including their IP addresses, valid subdomains, and related websites.

How can I search for subdomains effectively?

You can use search queries and external asset discovery to search for subdomains effectively. This method helps locate subdomains and related information, making it valuable for information security professionals.

What is the relationship between a top-level domain and subdomains?

A top-level domain (TLD) is the highest level in the domain name hierarchy. Subdomains are extensions of a domain and exist beneath the TLD.

When you work with subdomains, it’s important to understand their relationship to ensure the safety and confidentiality of information.

Feel free to explore these FAQs to gain a better understanding of subdomain discovery, DNS records, and related topics

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