Find All Subdomains (2024)

FAQs

Is there a way to find all subdomains? ›

Characteristics and Parameters of a Subdomain

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. Each subdomain can be up to 255 characters long, but for multi level subdomains, each level can only be 63 characters long.

You can explicitly block the indexation of specific URLs across your website by utilizing noindex tags. You can make sure a subdomain isn't included in Google's index by using either noindex <meta> tags or noindex HTTP response headers.

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.

A subdomain lookup tool, also known as a subdomain finder tool, helps identify subdomains associated with a domain name using passive DNS data.

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.

The most common subdomain is “www” or “world wide web.” The subdirectory points users to the main directory of a website—in other words, where your homepage and other core pages live. Other subdomains work to create distinct parts of a site. For example, Google's root domain is www.google.com.

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.

It is a separate part of your website that operates under the same primary domain name without you purchasing a new domain. You can also create unlimited subdomains for every domain you own. Please note that creating subdomains does not register a new domain name automatically.

Are subdomains worth it? ›

Are subdomains bad for SEO? Subdomains aren't directly bad for SEO, but they're not always the most strategic choice. Google states that subdomains and subdirectories are both fine, but subdomains are crawled and tracked separately.

Your subdomain reputation(s) can impact base domain reputation, but the impact between subdomains will be small. Subdomains are not a way to avoid a bad domain reputation. Instead, they will help differentiate your traffic while maintaining a clear relationship with your main domain.

Once you have completed all steps, the subdomain and its sitemap are added to the Google Search Console. Depending on the website size, it may take a little while before the subdomain becomes visible in Google search results.

Go to the DNS app. Locate the CNAME record for your subdomain, and click the 'Delete' button next to it. Confirm that you want to delete the record.

An unfinished website can also be a reason. If your website is under construction, you might not want visitors to access it until it's complete. Discouraging search engines from crawling a testing environment prevents them from accidentally indexing unfinished content.

PSA: Remember that subdomains are not a secret and should not be used to hide or secure services.

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.