John Cochran wrote:
> NTP servers will typically perform a DNS lookup when they start. However,
> once they start, they will never do another DNS lookup for the duration of
> their execution. Also many Unix style computers remain up and running for
> months to years without being rebooted.

Also at least some pieces of (Windows) (S)NTP software only do DNS 
lookups when you add a new server into the configuration. They 
permanently store the resolved IP address, so even reboots/restarts of 
the OS or software won't cause the name to be resolved again.

   Tapio
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