traceroute
traceroute <host>
Risk: Safe
What it does
Lists every exchange (hop) on the road to a machine.
When to use it
To see where on the road a call gets stuck.
Example
$ traceroute kedai.exampleOne line per hop. * * * is a quiet hop.
$ sudo apt install tracerouteNot installed by default on Debian.
Learn it in: ping and traceroute · Official docs