Check out the java.net.Inet4Address and InetAddress. Or are u looking
for a Swing component that will store ur data. ???

--
Suman

Well its pretty simple here it goes

class MyIP
{
 String ipAddress,subNetMask;
  public MyIP(String ip,String subnet)
  {
    this.ipAddress=ip;
    this.sunNetMask= subnet;
  }

  //Getters and setters
  public String getIPAddress()
  {
    return ipAddress;
  }

  public String getSubNetMask()
  {
      return sunNetMask;
  }

  public void setIP(String ip)
  {
    this.ipAddress =ip;
  }
  public void setSunNetMask(String subNet)
  {
    this.sunNetMask = subNet;
  }
}

This is a simple holder that will act as a your IP component. But there
are allready classes in .java.net package that you could use check out
that.

Cheers!!!
Suman