Subdomain Finer (2024)

FAQs

Is there a way to find all subdomains? ›

Subdomains aren't inherently bad for SEO, but they can impact your site's SEO strategy if not used wisely. Since subdomains are treated as separate entities by search engines, they may dilute the overall authority of your main site if not managed properly.

There are several tools with dictionaries to check for possible takeovers: https://github.com/EdOverflow/can-i-take-over-xyz. https://github.com/blacklanternsecurity/bbot. https://github.com/punk-security/dnsReaper.

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.

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.

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.).

Scraping (JS/Source Code): Scraping is the practice of extracting subdomains from source code and JavaScript files present on web pages using tools like httpx and gospider to facilitate this process. Professionals use such software to crawl websites in order to extract subdomains.

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

Subdomain takeover can have severe legal implications, as attackers may engage in illegal activities or host malicious content on compromised subdomains.

What can hackers do with subdomains? ›

Data Breaches: Subdomain takeover can lead to unauthorized access to sensitive data or user information. Attackers could exploit the subdomain to trick users into divulging confidential information, such as login credentials, personal data, or financial details.

Subdomain Spoofing: Attackers can create subdomains that appear to be legitimate but are actually fake.

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.).

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. Google also supports the minus operator to exclude any subdomains we are not interested in.

Go to GA4 admin > Data Streams > Select your web data stream > Configure Tag Settings > Show More > List unwanted referrals and then enter your main domain there. For example, if your subdomains are subdomain1.example.com and subdomain2.example.com, then enter example.com in the settings of GA4.

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.