# Webserver Virtualhost Subdomains

You can use a web fuzzer to enumerate whether the web server is configured with any subdomains. Change the "Host" header and see if the website responds with something different.

For example, to enumerate subdomains of `*.bart.htb`, you can do:

```
ffuf -w /usr/share/seclists/Discovery/DNS/subdomains-top1million-110000.txt -H "HOST:FUZZ.bart" -u http://bart:80 2>&1 
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://heinosass.gitbook.io/leet-sheet/web-app-hacking/enumeration/webserver-virtualhost-subdomains.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.