Free Subdomain Finder: Find all Subdomains of a Website (2024)

Total traffic

Total traffic cost

Keywords total

Location

Date

Traffic share

The tool shows the percentage of traffic a subdomain brings to the analyzed website. This metric demonstrates the traffic share for the selected location and period.

Total traffic

The tool shows the subdomain's organic traffic volume. SE Ranking calculates the expected click-through rate, search volume, and current keyword rankings to estimate this value.

Total traffic cost

This metric indicates the estimated cost of organic traffic a subdomain gets by targeting all discovered keywords. The tool displays cost in the equivalent of Google Ads prices.

Keywords total

The total number of keywords a subdomain ranks for in its organic search. Click through to get more data on each keyword: traffic, difficulty, search volume, competition and SERP features.

Location

Analyze subdomain performance across any location. Select any of the 190 countries to access country-level data.

Date

Get comprehensive research reports for the selected month. Access historical data to get detailed information for any past month going back to February 2020.

Why you need a subdomain finder

Keeping tabs on subdomains is essential for any site optimization. Search engines consider each subdomain a different site, so you need to optimize each separately to boost overall traffic and improve website performance. A subdomain scanner also helps find duplicate content, which can damage rankings of both the main domain and subdomain. It also helps identify poor-quality backlinks to subdomains that can diminish your SEO efforts.

How our subdomain finder works

How to use our subdomain scanner

Subdomain Finder is straightforward to use. To start, enter the target domain address and click Scan. The tool will take you to Subdomains section of SE Ranking’s Competitive Research, which reveals comprehensive, up-to-date data on every found subdomain—access data on traffic volume, share, and cost, along with the number of keywords. Filter subdomains by any metrics and access the detailed keywords report by clicking on the number of keywords. Finally, click the Export button to download the report in the .csv or .xsl format.

How reliable is our subdomain checker

Subdomain scanner ensures the highest accuracy of results. It aggregates relevant information from search engines and supplementary databases and sends additional requests to domain service providers to get the most complete and up-to-date results. The scanner is secure; we don’t save or publish any information about checked domains and their subdomains.

You can find DNS records using the nslookup command in the command line. It shows all DNS records for a given domain, including a list of subdomains. The command works for Windows, Linux, and macOS operating systems.

The subdomain is displayed as a separate search result. Most search engines, including Google, consider subdomains as separate sites—they crawl, index, and rank them independently from the main site. Therefore, optimising the main domain and its subdomains is equally essential.

It is impossible to hide a subdomain from scanning completely. Subdomain checkers use publicly available DNS registers to find information. But even if the scanner has detected a subdomain, it does not necessarily mean that the page is publicly accessible—its content can be hidden.

Subdomain takeover happens when a subdomain points to a non-active external service, but the CNAME used for that service is still in the DNS records. Hackers can set up a virtual host for the subdomain and gain control over it.

Technically, yes. You can find it among other subdomains in the search results, but it often redirects to the main domain. When the Internet was first created, the www. prefix was used to distinguish sites that use the Internet protocol. Today, some hosting providers automatically create the WWW subdomain for all sites and set up a redirect.

Theoretically, there is no limit to the number of subdomains, but some DNS servers set restrictions. For example, GoDaddy limits users to 500 subdomains.