Subdomain Finder (2025)

FAQs

Is there a way to find all subdomains? ›

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.

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)

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.

The choice between subdomains and subdirectories largely depends on reasons outside of SEO. Both can be SEO-friendly. Whether you decide to use subdomains or subdirectories, you need to optimize them for the best chance of ranking in search engines.

1 Answer. Yes, you own and control the entire namespace below the domain you purchase, because DNS is hierarchical. Creating mail.example.com and blog.example.com is just a matter of adding entries to the DNS zone that you control. Since you asked about the name.

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.

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.

Who owns a subdomain? ›

Let's say you are making a pitch to a client to create their new website. You can create a subdomain that is specifically intended for them to give an idea of what their new website might look like. This is hosted on your own main domain, while retaining ownership of the subdomain.

While a subdomain will appear before your TLD, a subdirectory link will include the subdirectory name after the original TLD. For example: Subdomain example: mysubdomain.mywebsite.com. Subdirectory example: mywebsite.com/mysubdirectory.

The impact of subdomain hijacking can be severe, potentially leading to data breaches, financial losses, reputational damage, and the compromise of users' sensitive data.

Since subdomains are treated as separate entities by search engines, they may dilute the overall authority of your main site if not managed properly.

Subdomain takeover can have severe legal implications, as attackers may engage in illegal activities or host malicious content on compromised subdomains. It's crucial to report any such incidents to law enforcement authorities and take immediate steps to mitigate the risks to protect your reputation and users.

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.

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.

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.