This is a very brief history of the first days of network communications, in celebration of National Internet Day, Oct. 29.
ARPANET (Advanced Research Projects Agency Network) was the first operational wide-area packet-switched computer network and the direct technical forerunner of the modern Internet.
Established in the late 1960s by the DARPA (then known as ARPA), an agency of the U.S. Department of Defense.
- First Nodes: Went live in October 1969, connecting four initial university and research laboratories: UCLA, Stanford Research Institute (SRI), the University of California, Santa Barbara (UCSB), and the University of Utah.
- First Message: On Oct. 29, 1969, a programmer at UCLA attempted to type the word “login” to a computer at Stanford, though the system crashed after transmitting just the letters “Lo”.
- Core Technology: Built on decentralized packet-switching concepts and Interface Message Processors (IMPs) designed by Bolt Beranek and Newman (BBN). It originally used the Network Control Program (NCP) before officially transitioning to TCP/IP on January 1, 1983.
- Decommissioning: Split into ARPANET and MILNET (for military use) in 1984. ARPANET was officially decommissioned in 1990 after being superseded by networks like NSFNET.
This information will appear in our SUNDAY SCANNER, Issue #2643 for the Week of Oct. 25-31, 2026.

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