What was the very first message sent over the early internet in 1969?

The first message over ARPANET, the internet's precursor, was meant to be "LOGIN," sent from UCLA to Stanford, but the connection crashed right after "L" and "O" were transmitted, leaving an accidental two-letter message as the internet's inaugural communication. Researchers restored the connection shortly after and completed the full login, but the crash produced a memorable footnote in computing history.

"Hello, world" is a famous phrase used in programming tutorials to test new code, not the actual first internet message, and "Test 123" is a generic placeholder with no historical basis here.

That failed first attempt is celebrated rather than forgotten, with the university marking the spot and date as a landmark moment in the birth of networked computing.