> ## Documentation Index
> Fetch the complete documentation index at: https://help.decodo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Protocols

> Static Residential (ISP) Pay/GB Proxy Support for HTTP, HTTPS, and SOCKS5 Formats

The connection protocol (HTTP, HTTPS, or SOCKS5) can be specified in the tool or program you're using to connect with the proxies.

In the following cURL examples, the protocol is specified at the beginning of the proxy line, just replace the `username` and `password` with your proxy user credentials, and run them in your Terminal or Command Prompt.

## HTTP

Here is a `cURL` example for the `HTTP` protocol:

<CodeGroup>
  ```shellscript cURL theme={null}
  curl -x "http://username:password@isp.decodo.com:10001" "https://ip.decodo.com/json"
  ```
</CodeGroup>

## HTTPS

Using this protocol will **encrypt** your connection. Here is a `cURL` example for the `HTTPS` protocol:

<CodeGroup>
  ```shellscript cURL theme={null}
  curl -x "https://username:password@isp.decodo.com:10001" "https://ip.decodo.com/json"
  ```
</CodeGroup>

## SOCKS5

Both `UDP` and `TCP` connections are supported via `SOCKS5` with ISP Pay/GB proxies.

Here is a `cURL` example for the `SOCKS5` protocol:

<CodeGroup>
  ```shellscript cURL theme={null}
  curl -x "socks5h://username:password@isp.decodo.com:10001" "https://ip.decodo.com/json"
  ```
</CodeGroup>

<Note>
  The letter `h` in `socks5h://` means that the hostname will be resolved on the proxy side, and not locally.
</Note>

***

## Ports

Easily understand which ports you can access when using our proxies, including details on the default accessible ports and restrictions.

### Accessible Ports

With the **Static Residential (ISP) proxies**, only the following ports are accessible:

* `80`
* `443`
* `563`
* `8443`
* `43`

### Restricted Ports

Restricted ports include **`SMTP`**, **`IMAP`**, and other **mailing** and **messaging**-related ports.

<Warning>
  Please note that currently, restricted ports and any others not mentioned in the Accessible Ports list cannot be unblocked for **Static Residential (ISP) proxies**.
</Warning>

***

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