Reckoning by the publication of the first Request for Comment (RFC) document, the Internet was born April 7, 1969, when RFC 1 Title: Host Software was published by Steve Crocker.
RFC's document the protcols on the Internet. The precursor to today's Internet was the ARPANET, which was developed for the United States Department of Defense. The first RFCs were published in 1969 for the ARPANET. At first researchers distributed hard copies of the RFCs among themselves, but in December of 1969 they began distributing them using the ARPANET itself.
References:
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April 7, 1969: Birth of That Thing We Call the Internet
By Tony Long
Wired News -
Request for
Comments
Wikipedia, the free encyclopedia -
ARPANET
Wikipedia, the free encyclopedia -
RFC 1 Title: Host Software
By Steve Crocker
IETF Tools