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In 1969 the first message sent over ARPANET crashed after transmitting only the letters L and O. The figure is taken from Computer History Museum, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.

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Yes. It sits on the Technology shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.

Mondo Knows Facts

The first ARPANET message was intended to say LOGIN

In 1969 the first message sent over ARPANET crashed after transmitting only the letters L and O

On 29 October 1969, researchers at UCLA attempted to send the word LOGIN to a computer at Stanford University over ARPANET. The system crashed after receiving only the first two letters, making LO the first message sent across the network. The full connection was successfully established a few hours later.

Where this comes from

Computer History Museum

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Tags: arpanet, internet, networking

The first ARPANET message was intended to say LOGIN: the short answers

Where does this come from, and can I check it?: In 1969 the first message sent over ARPANET crashed after transmitting only the letters L and O. The figure is taken from Computer History Museum, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a technology fact?: Yes. It sits on the Technology shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.