What is Subdomain Lookup?

Subdomain Lookup is a tool for listing subdomains related to a domain. Enter a domain name and the tool shows discovered subdomains together with their last-seen dates.

It is useful for reviewing your own domain footprint, doing DNS-related research, or getting a quick look at the publicly visible structure of another domain.

How to Use

1. Enter the domain you want to check.
2. Run the search.
3. Review the subdomain list and last-seen dates.
4. Use “Load More” if there are more results.
5. Download the result as CSV if needed.

What You Can Review

Subdomain List

The tool shows each discovered subdomain in a list. You can also open listed entries directly to inspect them.

Last Seen Date

The last-seen date helps you understand when a subdomain was last observed. More recent dates can be useful when prioritizing what to review first.

Result Count and Pagination

When many records are available, you can review the current count and load more results. This also makes it easier to export a larger list once you have enough data.

Use Cases

• Reviewing subdomains under your own domain
• Doing a first-pass security check on publicly visible subdomains
• Inspecting a competitor's public service structure
• Building a target list for DNS or infrastructure investigation

Things to Keep in Mind

• The lookup relies on public information, so private subdomains will not appear
• The result may not be fully exhaustive
• A last-seen date shows an observation point, not a guarantee that the subdomain is still active