J.L.W.S. The Special One wrote:
Sorry, I misread your post. I thought you were referring to a regular IP block. Since the IP was blocked as an open proxy, please let the blocking admin (and other admins) know that the IP is not an open proxy, but is a shared IP belonging to a school. Once, my school IP was blocked as an open proxy (it was not an anon-only block), but I managed to get the admins to make the block anon-only. Hopefully, after you have notified the blocking admin, they will change the block to an anon-only block.
Sometimes shared IPs are reported as open proxies when they have an open proxy on the network behind them. The appropriate solution is to have the shared IP send X-Forwarded-For headers so that we can tell the normal requests from the open proxy requests.
-- Tim Starling