Domain Extension doubt

[onequestion]

Hi Friends..
please tell me how long a domain name extension can be? i know 3 digit extensions like
.com
.edu
.net
.org
.mil and so on

i also know 2+2 extensions like
co.in
co.uk
co.us and so on

is there any other combinations available?

Thanks...

[RedSon]

Nope, I don't think so.

[onequestion]

But what is this website:-( http://www2.austin.cc. tx.us/

I want to exactly retrieve the domain name like "austin" in http://www2.austin.cc. tx.us

yahoo from www.mail.yahoo. com // It is in 2nd position
austin from www2.austin.cc. tx.us // It is in 1st position
abc from www.xyz.qwerty. abc.efg.co.in // It is in 3rd position

is there any methods available in java?

actually now i am using this code

 private String getDomain(URL url)
     {
    	 String domain;
    	 Pattern p = Pattern.compile("[.]");
    	 String s[]=p.split(url.getAuthority());
    	 if(s[(s.length-1)].length()==2)
    		 domain = s[s.length-3];
    	 else
    		 domain = s[s.length-2];
    	 return domain;
     }

but it will work to retrieve domain only for 3digit country specific domain and 2 + 2 country specific domain. please help it is the important part in my project.

[RedSon]

But what is this website:-( http://www2.austin.cc. tx.us/

I want to exactly retrieve the domain name like "austin" in http://www2.austin.cc. tx.us

yahoo from www.mail.yahoo. com // It is in 2nd position
austin from www2.austin.cc. tx.us // It is in 1st position
abc from www.xyz.qwerty. abc.efg.co.in // It is in 3rd position

is there any methods available in java?

actually now i am using this code

 private String getDomain(URL url)
     {
    	 String domain;
    	 Pattern p = Pattern.compile("[.]");
    	 String s[]=p.split(url.getAuthority());
    	 if(s[(s.length-1)].length()==2)
    		 domain = s[s.length-3];
    	 else
    		 domain = s[s.length-2];
    	 return domain;
     }

but it will work to retrieve domain only for 3digit country specific domain and 2 + 2 country specific domain. please help it is the important part in my project.

Not sure, with out using REGEX it seems very difficult indeed.