JWhoIs is a simple WhoIs client library. By default, the client returns raw data (in a byte array) but it can be customized (the library contains a version that returns plain text). The library has also a Swing GUI that can be used in any Swing application.

There are currently no documentation but three examples can be checked for some insights : JWhoIsTest, TextWhoIsTest and JTextWhoIsGUITest.