What switch can we use in trace route command that will not resolve names?

use the option -d some other usage below

Options:    -d                 Do not resolve addresses to hostnames.    -h maximum_hops    Maximum number of hops to search for target.    -j host-list       Loose source route along host-list (IPv4-only).    -w timeout         Wait timeout milliseconds for each reply.    -R                 Trace round-trip path (IPv6-only).    -S srcaddr         Source address to use (IPv6-only).    -4                 Force using IPv4.    -6                 Force using IPv6.