pool.ntp.org hands out specific subdomains for large-scale pool users. This way, it is possible to retire service for a subset of users that use devices that ar

pool.ntp.org hands out specific subdomains for large-scale pool users. This way, it is possible to retire service for a subset of users that use devices that aren't updated anymore and are misbehaving. The traffic issue is not just punted to DNS service. It's possible to return a cachable 127.0.0.1 response, and it's somewhat rare for DNS caches to be constantly powered up and down and reach out directly to authoritative DNS servers.