Weirdly, a “You have a new message” banner popped up for me just me on a Wikipedia page last night, and apparently my current IP address, which I’ve had since, oh, Thursday, caused some grief eight years ago:
This IP address has been blocked because it is believed to be an open proxy or zombie computer. To prevent abuse, editing from these proxies is currently prohibited. For more information about open proxies and what you can do, please see the WikiProject on open proxies.
The message was dated 30 May 2006. I got this IP on 1 May 2014.
There is a process, sort of, by which I could request that this IP be unblocked, but I figure by the time it could be acted upon, I’d have a whole new IP. (The ISP seems to swap them out every four to eight days.)