As a network based module, which you are writting as a sort of drop-in replacment (or just similarly interfaced) module to Net::FTP ... i would suggest something under the Net:: namespace. But, this , like many other things, is up to discussion, and i would be interested in seeing other peoples ideas.

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Thus spake the Master Programmer:
"When you have learned to snatch the error code from the trap frame, it will be time for you to leave."
-- The Tao of Programming