You can definitely use it for debugging infrastructure you don't own/control just fine. You just need to understand what it's telling you and not believe that it's telling you anything else beyond what it is.
It, as well as the internet routing it's trying to observe, is going to give you different results at different times. It's not going to give you "random" results. Unless your routers literally use coinflips to decide whether to forward or drop icmp. Only then would it give random results.
It, as well as the internet routing it's trying to observe, is going to give you different results at different times. It's not going to give you "random" results. Unless your routers literally use coinflips to decide whether to forward or drop icmp. Only then would it give random results.