Inet4Address

public final class Inet4Address extends InetAddress

This class represents an Internet Protocol version 4 (IPv4) address. Defined by RFC 790: Assigned Numbers, RFC 1918: Address Allocation for Private Internets, and RFC 2365: Administratively Scoped IP Multicast

Textual representation of IP addresses

Textual representation of IPv4 address used as input to methods takes one of the following forms:

d.d.d.d

d.d.d

d.d

d

When four parts are specified, each is interpreted as a byte of data and assigned, from left to right, to the four bytes of an IPv4 address.

When a three part address is specified, the last part is interpreted as a 16-bit quantity and placed in the right most two bytes of the network address. This makes the three part address format convenient for specifying Class B net- work addresses as 128.net.host.

When a two part address is supplied, the last part is interpreted as a 24-bit quantity and placed in the right most three bytes of the network address. This makes the two part address format convenient for specifying Class A network addresses as net.host.

When only one part is given, the value is stored directly in the network address without any byte rearrangement.

For methods that return a textual representation as output value, the first form, i.e. a dotted-quad string, is used.

The Scope of a Multicast Address

Historically the IPv4 TTL field in the IP header has doubled as a multicast scope field: a TTL of 0 means node-local, 1 means link-local, up through 32 means site-local, up through 64 means region-local, up through 128 means continent-local, and up through 255 are global. However, the administrative scoping is preferred. Please refer to RFC 2365: Administratively Scoped IP Multicast

Public Method Summary

boolean	equals(Object obj) Compares this object against the specified object.
byte[]	getAddress() Returns the raw IP address of this InetAddress object.
String	getHostAddress() Returns the IP address string in textual presentation form.
int	hashCode() Returns a hashcode for this IP address.
boolean	isAnyLocalAddress() Utility routine to check if the InetAddress in a wildcard address.
boolean	isLinkLocalAddress() Utility routine to check if the InetAddress is an link local address.
boolean	isLoopbackAddress() Utility routine to check if the InetAddress is a loopback address.
boolean	isMCGlobal() Utility routine to check if the multicast address has global scope.
boolean	isMCLinkLocal() Utility routine to check if the multicast address has link scope.
boolean	isMCNodeLocal() Utility routine to check if the multicast address has node scope.
boolean	isMCOrgLocal() Utility routine to check if the multicast address has organization scope.
boolean	isMCSiteLocal() Utility routine to check if the multicast address has site scope.
boolean	isMulticastAddress() Utility routine to check if the InetAddress is an IP multicast address.
boolean	isSiteLocalAddress() Utility routine to check if the InetAddress is a site local address.

Inherited Method Summary

From class java.net.InetAddress

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) Given the name of a host, returns an array of its IP addresses, based on the configured name service on the system.
static InetAddress	getByAddress(byte[] addr) Returns an InetAddress object given the raw IP address .
static InetAddress	getByAddress(String host, byte[] addr, int scopeId)
static InetAddress	getByAddress(String host, byte[] addr) Creates an InetAddress based on the provided host name and IP address.
static InetAddress	getByName(String host) Determines the IP address of a host, given the host's name.
String	getCanonicalHostName() Gets the fully qualified domain name for this IP address.
String	getHostAddress() Returns the IP address string in textual presentation.
String	getHostName() Gets the host name for this IP address.
static InetAddress	getLocalHost() Returns the address of the local host.
static InetAddress	getLoopbackAddress() Returns the loopback address.
int	hashCode() Returns a hashcode for this IP address.
boolean	isAnyLocalAddress() Utility routine to check if the InetAddress in a wildcard address.
boolean	isLinkLocalAddress() Utility routine to check if the InetAddress is an link local address.
boolean	isLoopbackAddress() Utility routine to check if the InetAddress is a loopback address.
boolean	isMCGlobal() Utility routine to check if the multicast address has global scope.
boolean	isMCLinkLocal() Utility routine to check if the multicast address has link scope.
boolean	isMCNodeLocal() Utility routine to check if the multicast address has node scope.
boolean	isMCOrgLocal() Utility routine to check if the multicast address has organization scope.
boolean	isMCSiteLocal() Utility routine to check if the multicast address has site scope.
boolean	isMulticastAddress() Utility routine to check if the InetAddress is an IP multicast address.
boolean	isReachable(int timeout) Test whether that address is reachable.
boolean	isReachable(NetworkInterface netif, int ttl, int timeout) Test whether that address is reachable.
boolean	isSiteLocalAddress() Utility routine to check if the InetAddress is a site local address.
String	toString() Converts this IP address to a String.

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Public Methods

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.

Parameters

obj	the object to compare against.

Returns

• true if the objects are the same; false otherwise.

See Also

• InetAddress.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.

public String getHostAddress ()

Returns the IP address string in textual presentation form.

Returns

• the raw IP address in a string format.

public int hashCode ()

Returns a hashcode for this IP address.

Returns

• a hash code value for this IP address.

public boolean isAnyLocalAddress ()

Utility routine to check if the InetAddress in a wildcard address.

Returns

• a boolean indicating if the Inetaddress is a wildcard address.

public boolean isLinkLocalAddress ()

Utility routine to check if the InetAddress is an link local address.

Returns

• a boolean indicating if the InetAddress is a link local address; or false if address is not a link local unicast address.

public boolean isLoopbackAddress ()

Utility routine to check if the InetAddress is a loopback address.

Returns

• a boolean indicating if the InetAddress is a loopback address; or false otherwise.

public boolean isMCGlobal ()

Utility routine to check if the multicast address has global scope.

Returns

• a boolean indicating if the address has is a multicast address of global scope, false if it is not of global scope or it is not a multicast address

public boolean isMCLinkLocal ()

Utility routine to check if the multicast address has link scope.

Returns

• a boolean indicating if the address has is a multicast address of link-local scope, false if it is not of link-local scope or it is not a multicast address

public boolean isMCNodeLocal ()

Utility routine to check if the multicast address has node scope.

Returns

• a boolean indicating if the address has is a multicast address of node-local scope, false if it is not of node-local scope or it is not a multicast address

public boolean isMCOrgLocal ()

Utility routine to check if the multicast address has organization scope.

Returns

• a boolean indicating if the address has is a multicast address of organization-local scope, false if it is not of organization-local scope or it is not a multicast address

public boolean isMCSiteLocal ()

Utility routine to check if the multicast address has site scope.

Returns

• a boolean indicating if the address has is a multicast address of site-local scope, false if it is not of site-local scope or it is not a multicast address

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

public boolean isSiteLocalAddress ()

Utility routine to check if the InetAddress is a site local address.

Returns

• a boolean indicating if the InetAddress is a site local address; or false if address is not a site local unicast address.