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IP or Domain  Count 4 8 16 32 64  
Ping uses the ICMP protocol's mandatory ECHO_REQUEST datagram to elicit an ICMP ECHO_RESPONSE from a host or gateway.
ECHO_REQUEST datagrams ('pings') have an IP and ICMP header, followed by a struct timeval and then an arbitrary number of 'pad' bytes used to fill out the packet.

The Story of the PING Program from the author
Ping From Wikipedia
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