DoIT NTP servers
DoIT has several stratum-2 or less servers; we do not have our own stratum-1 time source.
DoIT operates a few NTP (Network Time Protocol) servers that are available for public use. This document describes the service.
The addresses are as follows:
ntp1.doit.wisc.edu 220.127.116.11 18.104.22.168 2607:f388::123:1 ntp2.doit.wisc.edu 22.214.171.124 2607:f388::123:2 ntp3.doit.wisc.edu 126.96.36.199 2607:f388::123:3