Result
How traceroute works
Each packet carries a counter that drops by one at every router. When it reaches zero, the router discards the packet and reports back to the sender. Traceroute sends packets with counter 1, 2, 3 and so on, and thereby learns one by one which routers are on the path and how fast they respond.
Asterisks mean that a router did not answer – this is often intentional and not an error. What matters is from which hop the times jump or no more answers come back. For security reasons we show internal hops of our own network without their address.
Frequently asked questions
Why can’t I see the way back?
Traceroute only measures the outbound path. The return path may run through other networks; it would need a measurement from the other side.
How many hops are checked?
At most 30 – enough for practically every target. We send exactly one probe per hop and wait up to two seconds for the answer.
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