Subdomain Finder (2024)

FAQs

Is there a way to find all subdomains? ›

Subdomains aren't directly bad for SEO, but they're not always the most strategic choice.

This type of subdomain enumeration is resource-intensive and may have legal and ethical implications since sending large requests to a target domain is required. Because of its intrusive nature, active subdomain enumeration may trigger security alerts.

It's a cyber threat executed when an attacker gains control of a legitimate subdomain that's no longer in use, then cleverly exploits the forgotten or misconfigured dangling DNS to host their own content on the previously used zone.

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.

If you buy a domain you control all of its subdomains, but if you have no hosting then you will have nowhere to connect the subdomains to. So yes, you get access to all the domain's subdomains, and you could even forward the subdomain to any page you like for free if your registrar offers free domain forwarding.

Websites that use multiple subdomains risk exposing themselves to cyberattacks. Subdomain takeovers can lead to data breaches and reputational damage. However, these risks can be minimized with the right strategies, and your organization can stay protected.

to secure a subdomain you need to either generate a new certificate for each subdomain or use a wildcard SSL certificate. A wildcard SSL certificate will automatically secure the main domain and all subdomains. A wildcard SSL certificate can be generated by using the Let's Encrypt DNS verification method.

Subdominator is a dependable and fast open-source command-line interface tool to identify subdomain takeovers.

What is subdomain stripping? ›

Subdomain stripping is the process of removing the subdomains from the main domain and delivering the emails to the main domain directly.

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.

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.

Using a dimension to filter by subdomain in GA4 reports

The default settings in GA4 allow you to see when users move between your domain and your subdomains. The fastest way is by using the Hostname dimension in the standard GA4 reports. You can, for example, use this in the Engagement report as follows.

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.