Re:Ask HN: What is the oldest image online in which the link...
by curlypaul924 on Thursday February 04, 2021 @12:15PM
(#26027416)
That's a great resource! Most of those links are no longer functioning, but I did find this image:
dated 30 Sept 1992, which is pretty old as far as the web goes.
The list of all webservers used to fit on a single page, which might be a good starting point. However, at this point I believe anything still functioning might fit your definition of a "mirror" as few things still speak HTTP/0.9.