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Ping is the name of an application (a binary executable file) installed on nearly every networked computer on the planet. Ping is designed to use Internet Control Message Protocol (ICMP) to calculate and display round trip times to a host over a LAN, not the Internet, though it can be used in any Internet Protocol-based network. From an OSI Model perspective, Ping is incorporated (per RFC 792) into the Internet Protocol (IP).

For such purposes this protocol, the Internet Control Message Protocol (ICMP), is used. ICMP, uses the basic support of IP as if it were a higher level protocol, however, ICMP is actually an integral part of IP, and must be implemented by every IP module.

Ping was designed as a tool to allow users to test whether a remote host is available and how long it takes that host to respond across the network. Getting a successful result from a ping indicates that the remote computer can be reached through the network and is responding to ICMP.

Ping can provide round-trip times between the local host running the Ping and the target host the local host is pinging.

However, these round trip times are often deceiving and cannot be relied upon as the nature of IP networks has altered considerably since this tool was created.

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