But also if you want check the real latency.

To check how close nodes are to you, you need to use a tcp ping program, since some of the nodes you can't use a standard ping.

On windows, check here for psping that will do a tcp ping: Microsoft psping https://docs.microsoft.com/en-us/sysinternals/downloads/psping
e.g. psping -4 -n 10 de.ckpool.org:3333
      psping -4 -n 10 solo.ckpool.org:3333