Getting client IP

[Rafaqat Ali]

Hello
    I am using xml-rpc default service. I mean I have written my own class say Adder which has a method add. In XmlRpcServlet.properties coressponding entry is
                   Adder=com.test.Adder.
On server side say I haven't used any ohter class. Now I want to check clients IP address and DNS. Will it be done by HTTP hearders ?
 if so How can I access those headers ? and if not so then how can I get this information ?

Regards
Rafaqat Ali