traceroute
Computer program
In computing, traceroute and tracert are computer network diagnostic commands for displaying possible routes and measuring transit delays of packets across an Internet Protocol network. Wikipedia
Function: Trace the route to HOST
Syntax: traceroute -FIldnrv -f 1st_ttl -m max_ttl -p port# -q nqueries -s src_addr -t tos -w wait -g gateway -i iface -z pausemsecs HOST data size
Initial release: 1987; 37 years ago
Original author(s): Van Jacobson