> ## 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
> ISP Pay/IP Proxy Advanced Parameter Specification to Control Your Connection
Decodo offers customizable proxy access through a single backconnect endpoint and port: `isp.decodo.com:10000`.
To specify all proxy parameters in your request, you can use one method: [**Username and password**](https://help.decodo.com/docs/isp-pay-per-ip-proxy-user-pass-requests).
Backconnect parameters **are not** supported by **ISP Pay/IP** proxies when authenticating via the **whitelisted IP** method.
***
## 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). The available locations depend on the IPs you've purchased. |
| `city` | `london` | City name. Adding this parameter allows you to specify the city of the IP address you want to use. Please use this parameter together with the `country` parameter. |
| `state` | `california` | US state. Supports the **USA** location when you pick `us` as the country parameter. It will allow you to specify the US state of the IP you want to use. |
| `asn` | `21769` | Target the ASN number of a specific carrier. You can look up carrier numbers by searching online, for example, [**here**](https://asnlookup.com/). |
***
## 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/isp-pay-per-ip-proxy-user-pass-requests) section.
***
## 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/isp-pay-per-gb-proxy-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 an IP from a random location with a rotating session
```shellscript cURL theme={null}
curl -U "username:password" -x "isp.decodo.com:10000" "https://ip.decodo.com/json?provider=IPinfo"
```
##### Get an IP from a specific location (in this example, the US) with a static session
```shellscript cURL theme={null}
curl -U "user-username-country-us:password" -x "isp.decodo.com:10001" "https://ip.decodo.com/json?provider=IPinfo"
```
##### Get an IP from a specific location (in this example, Italy) with a rotating session
```shellscript cURL theme={null}
curl -U "user-username-country-it:password" -x "isp.decodo.com:10000" "https://ip.decodo.com/json?provider=IPinfo"
```
##### Get an IP from a specific location (in this example, London) with a static session
```shellscript cURL theme={null}
curl -U "user-username-country-gb-city-london:password" -x "isp.decodo.com:10001" "https://ip.decodo.com/json?provider=IPinfo"
```
Get an IP from a specific ASN (in this example, Frontier) with a static session
```shellscript cURL theme={null}
curl -U "user-username-asn-5650:password" -x "isp.decodo.com:10001" "https://ip.decodo.com/json?provider=IPinfo"
```
##### Get a specific IP (in this example, the IP remains unspecified) with a static session
```shellscript cURL theme={null}
curl -U "user-username-ip-x.x.x.x:password" -x "isp.decodo.com:10001" "https://ip.decodo.com/json?provider=IPinfo"
```
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.
***
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