You might want to give some additional information. DO you i.e. want to prevent users from browsing to https://www.whatismyip.com/ ? Or do you mean something differently?
Better question...why?
I need to hide the address due to repeated attack
The attack cannot be stopped from inside the server
The attack sends more than 40,000 packets
icmp attack type
The address causing the attack is usually variable like 181.214.147.132
or 181.214.147,146
I disabled the protocol ( udp-tcp-icmp)
Via filter input
The attack was not prevented though