Professor Leonard Kleinrock, in 1969. (Image by UCLA.)

The first host-to-host message sent over the nascent Internet occurred in 1969 at UCLA, which has belatedly created a shrine to the place where it all started. An excerpt from a story on the topic by Southern California Public Radio:

“In a small computer lab in a forgotten building at UCLA, Professor Leonard Kleinrock and a group of graduate students sent the very first message over what would become the Internet, back in 1969. Since that milestone, the room was in continuous use as a classroom, and its significance to history was all but forgotten. But now the room has been transformed into a re-creation of the ARPA lab, complete with the original equipment from the ’60s and period furnishings to match.

The Interface Message Processor, or IMP as engineers fondly call it, stands in the same spot in 3420 Boelter Hall today as it did in 1969. It functioned much like a modem, sending messages from the host computer, an SDS Sigma 7, through the network to an IMP in a remote location, which relayed it to another host computer.

During the ’60s, UCLA was chosen as the first node of what was known as ARPANET, a precursor to the Internet funded by the Defense Department’s Advanced Research Project Agency (DARPA). UCLA set up the very first network connection between their IMP and the IMP at Stanford Research Institute in northern California.

On October 29, 1969, Kleinrock and his team undertook a simple task to test the network – sending a login request from their host computer to the host computer at SRI.”

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Leonard Kleinrock recalls the birth of the Internet: