The Packet Internet Groper protocol (Ping) is a "testing" protocol. Ping operates by sending Internet Control Message Protocol (ICMP) echo request packets to the target IP address and waiting for an ICMP response. In the process it measures the time from transmission to reception (round-trip time) and records any packet loss. A Ping client is required.
You can ping any IP address, but users at some addresses (particularly government agencies) might consider the ping to be a prelude to a cyber attack. Below therefore are links to websites that list IP addresses cautioned to be AVOIDED!