Path ping

What it does: traces the path, then sends a burst of pings to each hop to measure per-hop packet loss and average latency. The best tool for "where on the path is it degrading?" Same IPv4/IPv6/Auto family picker as Ping/Trace.

Safe to run: yes (a bit slower — it measures each hop).

Reading results: the first hop with significant loss/latency is your prime suspect. Loss only at the final hop with healthy hops before it can just be the destination rate-limiting ICMP.