What type of tool most likely generated a list of IP addresses with time metrics for each hop?

Traceroute is a network diagnostic tool that is specifically designed to track the path data packets take from one host to another across a network. It works by sending out packets with incrementally increasing Time to Live (TTL) values. Each router that processes these packets decrements the TTL value; when the value reaches zero, the router discards the packet and sends back an ICMP "Time Exceeded" message to the sender. This process reveals the IP address of each hop (router) along the path to the destination.

As the tool collects data for each hop it encounters, it also measures the time it takes for the packet to go to each hop and back, hence generating a time metric for each route. This data allows network administrators to diagnose where delays may be occurring in the network path.

In contrast, the other options serve different purposes: Ping checks connectivity and measures round-trip time but doesn't provide a detailed path like Traceroute does. DNS Lookup translates domain names into IP addresses without detailing the routes taken. A Port Scanner is used to identify open ports on target systems rather than routes or hops. Thus, Traceroute is the tool that aligns with the requirement of generating a list of IP addresses along with metrics.