How Traceroute can know domain name of Hops?

StackOverflow https://stackoverflow.com/questions/10570348

  •  08-06-2021
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Question

I'm studying the ICMP protocol and the tool traceroute. I don't understand how can traceroute look up the domain names of Hops if in the ICMP datagram only the IPs can be found. How does it work?

Thank you!

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Solution

It's called reverse DNS, and is basically the opposite of a domain-to-IP lookup.

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