# Proxy Format

The proxy format defines how authentication details are combined with the IP address and port. This applies to all proxy types, including Residential, Datacenter, ISP, and IPv6.

**Available Proxy Formats**

<figure><img src="/files/vdAhcwqbqVTATcbVo4M1" alt=""><figcaption></figcaption></figure>

**IP:PORT:USER:PASS**

This option is commonly used by tools that expect credentials as part of a single string rather than a URL.

**USER:PASS\@IP:PORT**

This format is widely supported by browsers, libraries, and most scraping frameworks.


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# 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://docs.plainproxies.com/resources/proxy-format.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.