Part of ipshu.comAll clear69 tested URLs
https://en.ipshu.com/ipv4/0.0.0.0%252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525252525SelfCensorship
This URL has not been tested yet.