Inet4Address() 
{
    /*
     * Perform initializations.
     */
        init();
        super();
        hostName = null;
        address = 0;
        family = IPv4;
}

 Inet4Address(String hostName,
    byte[] addr) 
{
        this.hostName = hostName;
        this.family = IPv4;
        if (addr != null) {
            if (addr.length == INADDRSZ) {
                address  = addr[3] & 0xFF;
                address |= ((addr[2] < <  8) & 0xFF00);
                address |= ((addr[1] < <  16) & 0xFF0000);
                address |= ((addr[0] < <  24) & 0xFF000000);
            }
        }
}

 Inet4Address(String hostName,
    int address) 
{
        this.hostName = hostName;
        this.family = IPv4;
        this.address = address;
}

 public boolean equals(Object obj) 
{
        return (obj != null) && (obj instanceof Inet4Address) &&
            (((InetAddress)obj).address == address);
}

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.

 public byte[] getAddress() 
{
        byte[] addr = new byte[INADDRSZ];
        addr[0] = (byte) ((address  > > > 24) & 0xFF);
        addr[1] = (byte) ((address  > > > 16) & 0xFF);
        addr[2] = (byte) ((address  > > > 8) & 0xFF);
        addr[3] = (byte) (address & 0xFF);
        return addr;
}

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].

 public String getHostAddress() 
{
        return numericToTextFormat(getAddress());
}

Returns the IP address string in textual presentation form.

 public int hashCode() 
{
        return address;
}

Returns a hashcode for this IP address.

 public boolean isAnyLocalAddress() 
{
        return address == 0;
}

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

 public boolean isLinkLocalAddress() 
{
        // link-local unicast in IPv4 (169.254.0.0/16)
        // defined in "Documenting Special Use IPv4 Address Blocks
        // that have been Registered with IANA" by Bill Manning
        // draft-manning-dsua-06.txt
        return (((address  > > > 24) & 0xFF) == 169)
            && (((address  > > > 16) & 0xFF) == 254);
}

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

 public boolean isLoopbackAddress() 
{
 /* 127.0.0.1 */
        /* 127.x.x.x */
        byte[] byteAddr = getAddress();
        return byteAddr[0] == 127;
}

 public boolean isMCGlobal() 
{
        // 224.0.1.0 to 238.255.255.255
        byte[] byteAddr = getAddress();
        return ((byteAddr[0] & 0xff)  >= 224 && (byteAddr[0] & 0xff) < = 238 ) &&
            !((byteAddr[0] & 0xff) == 224 && byteAddr[1] == 0 &&
              byteAddr[2] == 0);
}

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

 public boolean isMCLinkLocal() 
{
        // 224.0.0/24 prefix and ttl == 1
        return (((address  > > > 24) & 0xFF) == 224)
            && (((address  > > > 16) & 0xFF) == 0)
            && (((address  > > > 8) & 0xFF) == 0);
}

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

 public boolean isMCNodeLocal() 
{
        // unless ttl == 0
        return false;
}

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

 public boolean isMCOrgLocal() 
{
        // 239.192 - 239.195
        return (((address  > > > 24) & 0xFF) == 239)
            && (((address  > > > 16) & 0xFF)  >= 192)
            && (((address  > > > 16) & 0xFF) < = 195);
}

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

 public boolean isMCSiteLocal() 
{
        // 239.255/16 prefix or ttl <  32
        return (((address  > > > 24) & 0xFF) == 239)
            && (((address  > > > 16) & 0xFF) == 255);
}

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

 public boolean isMulticastAddress() 
{
        return ((address & 0xf0000000) == 0xe0000000);
}

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.

 public boolean isSiteLocalAddress() 
{
        // refer to RFC 1918
        // 10/8 prefix
        // 172.16/12 prefix
        // 192.168/16 prefix
        return (((address  > > > 24) & 0xFF) == 10)
            || ((((address  > > > 24) & 0xFF) == 172)
                && (((address  > > > 16) & 0xF0) == 16))
            || ((((address  > > > 24) & 0xFF) == 192)
                && (((address  > > > 16) & 0xFF) == 168));
}

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

 static String numericToTextFormat(byte[] src) 
{
        return (src[0] & 0xff) + "." + (src[1] & 0xff) + "." + (src[2] & 0xff) + "." + (src[3] & 0xff);
}