In the traceroute command, the -n option is used to disable reverse DNS lookups on IP addresses. When using traceroute, it will attempt to resolve IP addresses to hostnames by default so that hostnames can be displayed while tracing the route path. This can help identify particular nodes in a network. However, if you only care about IP addresses and not hostnames, you can use the -n option to disable reverse DNS lookups.
The traceroute command with the -n option will display IP addresses directly without any reverse DNS lookups. This may be more useful in certain situations, particularly when there are issues or delays with DNS resolution in the network environment. By disabling reverse DNS lookups, the traceroute command can display the route path more quickly without waiting for DNS lookups to complete.
traceroute -U example.com
traceroute -c 5 example.com
traceroute -n example.com
traceroute -r example.com