Uses of Class java.net.UnknownHostException (Java Platform SE 8 )
Date: 2026-04-17

## Uses of Class
java.net.UnknownHostException

- Packages that use UnknownHostException
  Package | Description
  --- | ---
  java.net | Provides the classes for implementing networking applications.
  javax.net | Provides classes for networking applications.
  javax.net.ssl | Provides classes for the secure socket package.

- - ### Uses of UnknownHostException in java.net

    Methods in java.net that throw UnknownHostException
    Modifier and Type | Method and Description
    --- | ---
    `static InetAddress[]` | InetAddress.`getAllByName(String host)` Given the name of a host, returns an array of its IP addresses, based on the configured name service on the system.
    `static InetAddress` | InetAddress.`getByAddress(byte[] addr)` Returns an `InetAddress` object given the raw IP address .
    `static InetAddress` | InetAddress.`getByAddress(String host, byte[] addr)` Creates an InetAddress based on the provided host name and IP address.
    `static Inet6Address` | Inet6Address.`getByAddress(String host, byte[] addr, int scope_id)` Create an Inet6Address in the exact manner of `InetAddress.getByAddress(String,byte[])` except that the IPv6 scope_id is set to the given numeric value.
    `static Inet6Address` | Inet6Address.`getByAddress(String host, byte[] addr, NetworkInterface nif)` Create an Inet6Address in the exact manner of `InetAddress.getByAddress(String,byte[])` except that the IPv6 scope_id is set to the value corresponding to the given interface for the address type specified in `addr`.
    `static InetAddress` | InetAddress.`getByName(String host)` Determines the IP address of a host, given the host's name.
    `static InetAddress` | InetAddress.`getLocalHost()` Returns the address of the local host.

    Constructors in java.net that throw UnknownHostException
    Constructor and Description
    `Socket(String host, int port)` Creates a stream socket and connects it to the specified port number on the named host.

  - ### Uses of UnknownHostException in javax.net

    Methods in javax.net that throw UnknownHostException
    Modifier and Type | Method and Description
    --- | ---
    `abstract Socket` | SocketFactory.`createSocket(String host, int port)` Creates a socket and connects it to the specified remote host at the specified remote port.
    `abstract Socket` | SocketFactory.`createSocket(String host, int port, InetAddress localHost, int localPort)` Creates a socket and connects it to the specified remote host on the specified remote port.

  - ### Uses of UnknownHostException in javax.net.ssl

    Constructors in javax.net.ssl that throw UnknownHostException
    Constructor and Description
    `SSLSocket(String host, int port)` Used only by subclasses.
    `SSLSocket(String host, int port, InetAddress clientAddress, int clientPort)` Used only by subclasses.

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