Translations:Manual:Combating spam/56/en

Some bots exist, e.g. on Wikimedia wikis, to detect and block open proxies IPs, but their code is often not public. Most such blocks are performed manually, when noticing the abuse. It's hence important to be able to tell whether an abusing IP is an open proxy or something else, to decide how to deal with it; even more so if it's an IP used by a registered user, retrieved with the $1 extension.