> ## 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.

# Introduction

> Dedicated Datacenter Proxy Advanced Parameter Specification to Control Your Connection

Decodo offers customizable proxy access through a single backconnect endpoint and port: `dc.decodo.com:10000`.

To specify all proxy parameters in your request, you can use one method: [**Username and password**](https://help.decodo.com/docs/dedicated-datacenter-user-pass-requests).

<Warning>
  Backconnect parameters **are not** supported by **Dedicated Datacenter** proxies when authenticating via the **whitelisted IP** method.
</Warning>

***

## Available Parameters

| Parameter | Example Value | Description                                                                                                                                      |
| --------- | ------------- | ------------------------------------------------------------------------------------------------------------------------------------------------ |
| `ip`      | -             | IP address. You can target an IP address from your purchased proxy IP list.                                                                      |
| `country` | `us`          | Country code. Please provide it in a two-symbol ISO format. You can check most ISO country codes [**here**](https://www.iban.com/country-codes). |

***

## Application support

### User:pass method

The backconnect entry node can also be used in various applications. In such a case, you will need to pass every parameter for your session alongside the username in the **username** field like this:

`user-username-country-country_code`

In the example above, `username` represents your proxy username, which you would need to get from the authentication section. In the `password` field, you only need to enter the proxy user's password.

More info is available in our [**User:pass Requests**](https://help.decodo.com/docs/dedicated-datacenter-user-pass-requests) section.

***

## cURL Examples

To use these commands, just replace `username` and `password` with your proxy user credentials and run them in your Terminal or Command Prompt.

##### Get a random IP you've purchased with a rotating session

<CodeGroup>
  ```shellscript cURL theme={null}
  curl -U "username:password" -x "dc.decodo.com:10000" "https://ip.decodo.com/json"
  ```
</CodeGroup>

##### Get an IP you've purchased from a specific location (in this example, the US) with a static session

<CodeGroup>
  ```shellscript cURL theme={null}
  curl -U "user-username-country-us:password" -x "dc.decodo.com:10001" "https://ip.decodo.com/json"
  ```
</CodeGroup>

##### Get a specific IP you've purchased (in this example, the IP remains unspecified) with a static session

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

<Note>
  When using any backconnect parameter, your username is also considered one of the parameters, therefore you need to add `user-` prefix before specifying your username, just like with all other parameters.
</Note>

***

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