# UnknownHostException

Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

# UnknownHostException

```
open class UnknownHostException : IOException
```

|---|---|---|---|----------------------------------------------------------------------------------------------------------------|
| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html)                                          |||||
| ↳ | [kotlin.Throwable](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-throwable/index.html)                           ||||
|   | ↳ | [java.lang.Exception](https://developer.android.com/reference/kotlin/java/lang/Exception.html#)                      |||
|   |   | ↳ | [java.io.IOException](https://developer.android.com/reference/kotlin/java/io/IOException.html#)                   ||
|   |   |   | ↳ | [java.net.UnknownHostException](https://developer.android.com/reference/kotlin/java/net/UnknownHostException#) |

Thrown to indicate that the IP address of a host could not be determined.

## Summary

|                                                                                                                                                  Public constructors                                                                                                                                                   ||
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| [UnknownHostException](https://developer.android.com/reference/kotlin/java/net/UnknownHostException#UnknownHostException())`()` Constructs a new`UnknownHostException`with no detail message.                                                                                                                       |
| [UnknownHostException](https://developer.android.com/reference/kotlin/java/net/UnknownHostException#UnknownHostException(kotlin.String))`(`message:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`)` Constructs a new`UnknownHostException`with the specified detail message. |

## Public constructors

### UnknownHostException

Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
UnknownHostException()
```

Constructs a new`UnknownHostException`with no detail message.  

### UnknownHostException

Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
UnknownHostException(message: String!)
```

Constructs a new`UnknownHostException`with the specified detail message.

|                                                    Parameters                                                    ||
|-----------|-------------------------------------------------------------------------------------------------------|
| `message` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!:the detail message. |