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BREAKING: The raids on Diddy's homes are just the start -- the feds are issuing subpoenas to companies doing business with him, aiming to identify anyone with info pertinent to the sex trafficking probe.

Sources with direct knowledge tell TMZ subpoenas -- all bearing Diddy's real name, Sean Combs -- were sent this week to various providers tied to the rapper, including his private charter jet, phone providers and computer companies.

We're told the subpoenas were fired off by the U.S. Attorney for the Southern District of New York ... which, as we've reported, is running the investigation.

Our sources say subpoenas will also be issued to commercial airlines, and possibly the FAA, just in case Diddy opted for commercial flights instead of his private jet.

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