Get Subdomains (2025)

FAQs

Is there a way to find all subdomains? ›

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.

One disadvantage of using subdomains for SEO is that they are treated as separate entities by search engines, which can dilute the overall authority of your main site. Additionally, managing content on subdomains can be more complex than on a subdirectory, as it requires separate hosting and maintenance.

A domain can have up to 500 subdomains. You can create multiple levels of subdomains such as store.product.yoursite.com, test.forum.yoursite.com, etc.

A Subdomain Finder is a subdomain enumeration tool that helps you discover subdomain hosts (aka subdomain FQDNs) which serve specific functions for your target (e.g. hosting public websites, private subdomains for testing web apps, URLs where you can find backups, etc.).

This helps you to create a different look, feel, and functionality for your online store than your main website. You'll come across subdomains like these all over the internet. They're incredibly common. To see whether your site is using any subdomains, crawl your website with Semrush's Site Audit tool.

All about subdomains

The most common subdomain is “www“, the World Wide Web.

Subfinder is a subdomain discovery tool that finds and returns valid subdomains for websites. Using passive online sources, it has a simple modular architecture optimized for speed. Subfinder is built for one thing - passive subdomain enumeration, and it does that very well.

Google Dorking

Google Dorks are one of the best ways to find extenstive information about a target. Google's search operators make it easy to narrow down the search to find more subdomains. We can use the "site" operator in the search bar to find all the subdomains that Google has indexed for a domain.

Yes, Google does index subdomains.

However, it's crucial to note that while Google indexes subdomains, each subdomain's ranking would still depend on the quality and relevance of its content, its inbound links, and several other SEO factors.

Does Google penalize subdomains? ›

Google will not penalize international websites that exist on separate subdomains if they have duplicate content. Instead, it will recognise the pages are identical and in most cases index both, but will only pick one URL to show in search results.

Yes, you should create separate XML sitemaps for each domain and subdomain. Each sitemap should list the URLs that are specific to that particular domain or subdomain to ensure search engines can crawl and index your content effectively.

But it's just a convention, and there are sites where it does make a difference. Subdomains named www (for World Wide Web) are not special compared to other subdomains. That is, there is no mechanical reason for a domain to be named www.example.com instead of hello.example.com .

Google discovers and prioritizes the indexation of URLs based on the links pointing to those URLs. These links can be from external domains or from other accessible subdomains on the same root domain.

You can usually locate it in the root or footer section of the website. For example, the XML sitemap URL could be “www.example.com/sitemap.xml“. Once you click on the sitemap, you will find all pages & subpages of a website.

There are some subdomains that are defined for virtually every domain name, such as www, and others that are very common, like shop or mail. But by going through and trying a DNS query using `dig`, `nslookup`, or `host` for as many possible subdomains, you might find some hidden ones.

While Nmap is primarily used for network mapping, it can also be used for subdomain hunting. Nmap uses various techniques, such as port scanning, to identify active subdomains and gather information about them.

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.