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# IP\_Endpoint::IsUnknown

[CAPL Functions](../../CAPLfunctions.md) » [Ethernet](../CAPLEthernetStartPage.md) » [Function Overview](../CAPLfunctionsIPOverview.md) » IP\_Endpoint::IsUnknown

[Valid for](../../../Shared/FeatureAvailability.md): CANoe DE • CANoe4SW DE

## Method Syntax

[Method](../../../Shared/CAPL/General/ClassesAndObjects.md) Syntax

```plaintext
long IP_Endpoint::IsUnknown();
```

## Description

Checks if the current transport protocol of this endpoint is unknown.

## Parameters

—

## Return Values

Returns 1 if the current transport protocol of this endpoint is unknown.

## Example

```plaintext
on start
{
  IP_Endpoint 192.168.1.1:4000 addr; //neither "UDP:" nor "TCP:" has been specified and thus the transport protocol is unknown
  if (addr.IsUnknown())
  {
    write( "Is endpoint with unknown transport protocol" );
  }
}
```
