Subdomain Finder (2025)

FAQs

Is there a way to find all subdomains? ›

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.

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

Google should be able to crawl and index your subdomains based on the URLs included in the primary domain's sitemap. However, it is recommended that you monitor the indexing status of your subdomains in Google Search Console to ensure that they are being indexed properly.

If all else fails, you can use Google search to find all the pages on a website. Simply type “site:example.com” (replace “example.com” with the website's URL) into Google's search bar, and it will return a list of all the pages on that site that Google has indexed.

However, Google treats subdomains as separate sites.

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

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.

Yes, you can set up multi-level subdomains on your domain, such as es.blog.coolexample.com. You'll want to keep SEO and user experience in mind when creating subdomains. If your subdomain is too long, it'll be hard to remember and visitors may have trouble finding that part of your website.

According to Google, subdomains and subdirectories are seen as equal when it comes to indexing and ranking. That said, real-world case studies show that subdirectories tend to rank faster and more effectively than subdomains on the first page of the search engine results page (SERPs).

Do subdomains need their own sitemap? ›

A sitemap is a file of your site's pages, links and other information that helps Google read and index your site. Each subdomain has its own dedicated sitemap that needs to be submitted to Google individually. Tip: You can check your subdomain's sitemap in the address bar by adding /sitemap.

One of the disadvantages of choosing for a subdomain is that because search engines see them as separate sites, they're treated as separate domains when it comes to determining rankings. Considerations need to be made for developing a subdomain into its own entity.

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.

Each domain name can have up to 500 subdomains. You can also add multiple levels of subdomains, such as info.blog.yoursite.com. 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.

Find Subdomains of a Domain with NsLookup:

Replace “example.com” 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.

To identify DNS entries within your organization that might be dangling, use Microsoft's GitHub-hosted PowerShell tools "Get-DanglingDnsRecords". This tool helps Azure customers list all domains with a CNAME associated to an existing Azure resource that was created on their subscriptions or tenants.