Subdomain Finder (2024)

FAQs

Is there a way to find all subdomains? ›

While subdomains can work well for some companies, depending on their goals, a subdirectory is often a better choice for SEO.

A subdomain takeover occurs when an attacker gains control over a subdomain of a target domain. Typically, this happens when the subdomain has a canonical name (CNAME) in the Domain Name System (DNS), but no host is providing content for it.

The Subdomain Scanner uses the target domain's DNS server (or any other DNS server specified) to scan the DNS records for possible subdomains. While scanning, the Subdomain Scanner will also automatically identify if the domain being scanned uses wildcards (*. example.com).

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.

Google will not penalize international websites that exist on separate subdomains if they have duplicate content. Instead, it will recognise the pages are identical and in most cases index both, but will only pick one URL to show in search results.

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.

Spinning Content

Content “spinning” is a straight-up bad SEO tactic. It involves copying ideas and structures from other websites, and then rewording parts of the content to avoid direct plagiarism.

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.

Does https hide subdomains? ›

While HTTPS encrypts the entire HTTP request and response, the DNS resolution and connection setup can reveal other information, such as the full domain or subdomain and the originating IP address, as shown above. Additionally, attackers can still analyze encrypted HTTPS traffic for “side channel” information.

The maximum depth of subdomains is determined by the number of characters supported by the web servers, i.e. 253 characters, including the root point. Each label (or subdomain block) can contain between 2 and 63 characters, with a limit of 127 DNS subdomains.

Subdomain spoofing

Attackers might also take advantage of subdomains by creating malicious sites that appear as if they are part of a larger, trusted domain. This can be particularly deceptive because the main part of the domain name remains unchanged.

Google discovers and prioritizes the indexation of URLs based on the links pointing to those URLs. These links can be from external domains or from other accessible subdomains on the same root domain.

A subdomain is a type of DNS record that adds a prefix to your domain, such as blog.mycoolnewbusiness.com. You can create a subdomain that uses an IP address by adding an A record to your DNS zone file. If you need a subdomain that connects to another domain name, you'll need to add a CNAME record instead.

A subdomain is a DNS record for a hostname that belongs to your domain. To add a subdomain, just use our DNS record editor and create the DNS record corresponding to the subdomain.

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.

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.

The nslookup command queries internet domain name servers in two modes. Interactive mode allows you to query name servers for information about various hosts and domains, or to print a list of the hosts in a domain.