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The origin of the 404 error code dates back to the early days of the World Wide Web. In 1992, Tim Berners-Lee, the inventor of the Web, and his team at CERN, the European Organization for Nuclear Research, created the first web server software, called CERN httpd.[2] This software used a simple file system to store and retrieve web pages, and it assigned a three-digit number to each type of request and response. The number 404 was chosen to indicate that the requested file was not found on the server.[3]

The term "404 Not Found" was coined by Berners-Lee himself, who explained in a 1998 interview that he wanted to make the error message "slightly apologetic".[4][3] He also said that he considered using "400 Bad Request" instead, but decided that it was too vague and technical.[4][3]

The first documented case of a 404 error appearing on a web page was in 1993, when a user tried to access a page about the Mosaic web browser on the NCSA website. The page had been moved to a different location, but the link had not been updated.[2] The user reported the error to the NCSA team, who fixed the link and added a humorous message to their 404 page: "We're sorry, but the document you requested is not here. Maybe you should try someplace else."