It's wild that it still works to this day. I just checked it the other day via PuTTY.

I first ran across it over 30 years ago while I was still in school, and I'm sure it's been up longer than that.

Haha yep, first thing I thought of as well.

They have a link to it on their site https://blinkenlights.de/en/p/links

me too and I hadn't thought of it in what feels like 20 years. I'm mad that's not what it was

Same. That was my introduction to telnet