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January 1, 1983General sourceWell documented

The internet switches to TCP/IP

On the timeline · around January 1, 1983 · The internet switches to TCP/IP197819801982198419861988

What happened

ARPANET's "flag day" migration to the TCP/IP protocol suite let independent networks interconnect as one internet.

Why it matters

The common language of the internet — still the protocol under every connection today.

Sources

The internet switches to TCP/IP — A Timeline of the Internet & Computing · SourcedStory