> For the complete documentation index, see [llms.txt](https://docs.9proxy.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.9proxy.com/developers/sdk/sdk-native-c/functions/testport.md).

# TestPort

Verify if the proxy at the given port is currently online.

```c
int TestPort(int port)
```

***

## Parameters

* **port**: Port to test.

## Return Value

* int: 1 if online/OK.

## Example

```c
// example

TestPort(10001);

```