Windows tracert tool

"You can find a detailed information about tracert at this link.

Extract from the link answering your question:

Traceroute is a tool that traces the
route that packets travel across a
network connection between two hosts.
The route between your computer and
your domain on our servers will vary
from time to time as the network
routers involved attempt to find the
fastest and most reliable route.

The name (if available) and IP address
of each gateway (router) is displayed,
along with the round trip time (in
milliseconds) for each of three trace
packets to reach the specified gateway
and return. These intervals may vary
widely as a function of network load.
Lost packets are indicated by an
asterisk (*)."