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## java.net
Class InetAddress

    java.lang.Object
      |
      +--java.net.InetAddress

All Implemented Interfaces:
  Serializable

public final class InetAddress
extends Object
implements Serializable

This class represents an Internet Protocol (IP) address.

Applications should use the methods `getLocalHost`, `getByName`, or `getAllByName` to create a new `InetAddress` instance.

Since:
  JDK1.0
See Also:
  `getAllByName(java.lang.String)`, `getByName(java.lang.String)`, `getLocalHost()`, Serialized Form

Method Summary
`boolean` | `equals(Object obj)` Compares this object against the specified object.
`byte[]` | `getAddress()` Returns the raw IP address of this `InetAddress` object.
`static InetAddress[]` | `getAllByName(String host)` Determines all the IP addresses of a host, given the host's name.
`static InetAddress` | `getByName(String host)` Determines the IP address of a host, given the host's name.
`String` | `getHostAddress()` Returns the IP address string "%d.%d.%d.%d".
`String` | `getHostName()` Gets the host name for this IP address.
`static InetAddress` | `getLocalHost()` Returns the local host.
`int` | `hashCode()` Returns a hashcode for this IP address.
`boolean` | `isMulticastAddress()` Utility routine to check if the InetAddress is an IP multicast address.
`String` | `toString()` Converts this IP address to a `String`.

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Method Detail

### isMulticastAddress

    public boolean isMulticastAddress()

  Utility routine to check if the InetAddress is an IP multicast address. IP multicast address is a Class D address i.e first four bits of the address are 1110.
  Returns:
    a `boolean` indicating if the InetAddress is an IP multicast address
  Since:
    JDK1.1

### getHostName

    public String getHostName()

  Gets the host name for this IP address.

  If there is a security manager, its `checkConnect` method is first called with the hostname and `-1` as its arguments to see if the operation is allowed.

  Returns:
    the host name for this IP address.
  Throws:
    `SecurityException` - if a security manager exists and its `checkConnect` method doesn't allow the operation .
  See Also:
    `SecurityManager.checkConnect(java.lang.String, int)`

### getAddress

    public byte[] getAddress()

  Returns the raw IP address of this `InetAddress` object. The result is in network byte order: the highest order byte of the address is in `getAddress()[0]`.
  Returns:
    the raw IP address of this object.

### getHostAddress

    public String getHostAddress()

  Returns the IP address string "%d.%d.%d.%d".
  Returns:
    the raw IP address in a string format.
  Since:
    JDK1.0.2

### hashCode

    public int hashCode()

  Returns a hashcode for this IP address.
  Overrides:
    `hashCode` in class `Object`
  Returns:
    a hash code value for this IP address.

### equals

    public boolean equals(Object obj)

  Compares this object against the specified object. The result is `true` if and only if the argument is not `null` and it represents the same IP address as this object.

  Two instances of `InetAddress` represent the same IP address if the length of the byte arrays returned by `getAddress` is the same for both, and each of the array components is the same for the byte arrays.

  Overrides:
    `equals` in class `Object`
  Parameters:
    `obj` - the object to compare against.
  Returns:
    `true` if the objects are the same; `false` otherwise.
  See Also:
    `getAddress()`

### toString

    public String toString()

  Converts this IP address to a `String`.
  Overrides:
    `toString` in class `Object`
  Returns:
    a string representation of this IP address.

### getByName

    public static InetAddress getByName(String host)
                                 throws UnknownHostException

  Determines the IP address of a host, given the host's name. The host name can either be a machine name, such as "`java.sun.com`", or a string representing its IP address, such as "`206.26.48.100`".
  Parameters:
    `host` - the specified host, or `null` for the local host.
  Returns:
    an IP address for the given host name.
  Throws:
    `UnknownHostException` - if no IP address for the `host` could be found.

### getAllByName

    public static InetAddress[] getAllByName(String host)
                                      throws UnknownHostException

  Determines all the IP addresses of a host, given the host's name. The host name can either be a machine name, such as "`java.sun.com`", or a string representing its IP address, such as "`206.26.48.100`".

  If there is a security manager and `host` is not null and `host.length()` is not equal to zero, the security manager's `checkConnect` method is called with the hostname and `-1` as its arguments to see if the operation is allowed.

  Parameters:
    `host` - the name of the host.
  Returns:
    an array of all the IP addresses for a given host name.
  Throws:
    `UnknownHostException` - if no IP address for the `host` could be found.
    `SecurityException` - if a security manager exists and its `checkConnect` method doesn't allow the operation.
  See Also:
    `SecurityManager.checkConnect(java.lang.String, int)`

### getLocalHost

    public static InetAddress getLocalHost()
                                    throws UnknownHostException

  Returns the local host.

  If there is a security manager, its `checkConnect` method is called with the local host name and `-1` as its arguments to see if the operation is allowed.

  Returns:
    the IP address of the local host.
  Throws:
    `UnknownHostException` - if no IP address for the `host` could be found.
    `SecurityException` - if a security manager exists and its `checkConnect` method doesn't allow the operation.
  See Also:
    `SecurityManager.checkConnect(java.lang.String, int)`

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