ARPANET connects four U.S. universities, launching the internet age

Story: 1969 C.E.  |  Last updated: October 29, 1969

On October 29, 1969 C.E., a graduate student at UCLA typed the letters “l” and “o” — the first two characters of the word “login” — and sent them across a phone line to a computer at the Stanford Research Institute (SRI) 350 miles away. The system crashed before the third letter arrived. But those two characters were enough. ARPANET, the world’s first wide-area packet-switched network, had sent its first message.

Key facts about ARPANET deployment

• ARPANET deployment: The first four nodes connected in 1969 C.E. were UCLA, the Stanford Research Institute, UC Santa Barbara, and the University of Utah — each chosen for its role in ARPA-funded computer science research.
• Packet switching: Rather than holding open a dedicated circuit between two points (as telephone networks did), ARPANET broke data into discrete packets that could travel independently and reassemble at their destination — a design that proved far more resilient and efficient.
• Protocol development: The Network Control Program, developed by graduate students including Steve Crocker and Jon Postel at UCLA, was implemented in 1970 C.E. and gave the network its first standardized language for communication.

Why the world needed a new kind of network

In the early 1960s C.E., computing was expensive and isolated. Researchers at universities funded by the U.S. Defense Department’s Advanced Research Projects Agency (ARPA) each had their own machines, their own terminals, their own protocols. Bob Taylor, who directed ARPA’s Information Processing Techniques Office, had three terminals in his office — each connected to a different computer, each requiring a different set of commands. You couldn’t easily share work, compare results, or collaborate across distance.

Taylor pushed for a solution. With a million dollars redirected from a ballistic missile defense budget, he hired Larry Roberts as program manager in 1967 C.E. to design the network. Roberts drew on the theoretical work of Paul Baran at the RAND Corporation, who had developed ideas about distributed message switching partly as a way to build systems resilient enough to survive partial destruction. He also incorporated the work of Donald Davies at the U.K.’s National Physical Laboratory, who had independently developed the concept of packet switching and coined the term itself.

The fact that both Baran and Davies arrived at similar ideas on opposite sides of the Atlantic — without knowing of each other’s work — suggests packet switching was, in some sense, an idea whose time had come.

The people who built it

ARPANET is often remembered as a product of government and institutional power. But much of its actual construction was done by graduate students working late hours on tight deadlines.

Steve Crocker, a UCLA graduate student, led the team that wrote the first Request for Comments (RFC) — a humble, collaborative document format that became the standard way the internet’s technical community develops and debates ideas to this day. Jon Postel, another UCLA graduate student on the same team, would go on to steward the internet’s address and naming systems for decades. Leonard Kleinrock at UCLA developed the mathematical theory of packet network analysis that underpinned the whole project.

The hardware — the Interface Message Processors (IMPs) that handled routing between nodes — was built by the firm Bolt Beranek & Newman (BBN) under a contract won in 1969 C.E. The lead designer was Bob Kahn, who later co-invented TCP/IP. The machines were refrigerator-sized, expensive, and, by modern standards, almost incomprehensibly limited. But they worked.

From four nodes to the internet

By 1971 C.E., ARPANET was declared operational and had expanded to 15 nodes. Remote login and file transfer followed. A primitive form of email emerged almost accidentally — and quickly became the network’s most popular feature.

The deeper transformation came in 1983 C.E., when TCP/IP — developed by Bob Kahn and Vint Cerf — became the standard protocol for all military networking and, eventually, for the internet itself. TCP/IP drew on ideas pioneered in France’s CYCLADES project, directed by Louis Pouzin, whose contributions to internetworking are less widely celebrated than they deserve to be. The architecture that emerged was genuinely collaborative — built across institutions, nations, and research traditions.

ARPANET was formally decommissioned in 1990 C.E., its job done. The commercial internet it made possible was already underway.

Lasting impact

It is difficult to name a technology that has reshaped human communication more completely than the internet. ARPANET’s core innovations — packet switching, distributed control, open protocol development — are still the architecture beneath everything from video calls to global financial transfers to the tools used to map disease outbreaks.

The RFC process Crocker invented in 1969 C.E. became a model for open, collaborative standard-setting that predates and arguably inspired much of the open-source movement. The idea that networks should be designed to survive partial failure — Baran’s original insight — proved prophetic in ways its authors couldn’t have imagined. And the decision to make ARPANET’s protocols open rather than proprietary meant that no single company or government could own the resulting infrastructure.

The global internet that followed connected billions of people, enabled new forms of organizing, commerce, science, and culture, and — for better and worse — fundamentally changed what it means to be informed, isolated, or heard.

Blindspots and limits

ARPANET was built by and for a narrow slice of humanity: funded by the U.S. military, operated through elite research universities, and accessible only to those with institutional credentials and the right equipment. Its founding vision of open resource-sharing did not extend to the public, and the communities who would eventually be most transformed by the internet had no seat at the table in 1969 C.E.

The same open architecture that enabled global connection also enabled surveillance, misinformation, and the concentration of platform power in ways the network’s designers did not anticipate and, in some cases, have since expressed regret about. Those tensions remain unresolved.

Read more

For more on this story, see: ARPANET — Wikipedia

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• The Good News for Humankind archive on technology

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