DoIT NTP servers
DoIT operates a few NTP (Network Time Protocol) servers that are available for public use. This document describes the service.
DoIT has three GPS-synched stratum-1 servers.
The service addresses are as follows:
ntp1.doit.wisc.edu (provided by ntp-cssc-8350-1) 22.214.171.124 (proxied to 126.96.36.199) 2607:f388::123:1
ntp2.doit.wisc.edu (provided by ntp-animal-226-1-mgmt) 188.8.131.52 2607:f388::123:2
ntp3.doit.wisc.edu (provided by ntp-432nm-b3a-1) 184.108.40.206 (proxied to 220.127.116.11) 2607:f388::123:3
Deprecated service address:
18.104.22.168 (deprecated provided by ntp-animal-226-1-mgmt on eth2)
The NTP appliances also have the following addresses. Service should be stable on their IPv4 address as well as the IPv6 service address (in 2607:f388::/64 service block eg. 2607:f388::123:1). In the future we may migrate the service addresses for ntp1.doit.wisc.edu (22.214.171.124) to the real address of the appliance (126.96.36.199) and ntp3.doit.wisc.edu (188.8.131.52) to (184.108.40.206), deprecating the existing service IPv4 addresses, although keeping them active for the foreseeable future as many devices will have those addresses hard-coded in their base OS config. The service names ntp1.doit.wisc.edu, ntp2.doit.wisc.edu and ntp3.doit.wisc.edu should continue to exist even if the IPv4 addresses they point to change in the future.
ntp-cssc-8350-1-mgmt.net.wisc.edu has address 220.127.116.11 ntp-cssc-8350-1-mgmt.net.wisc.edu has IPv6 address 2607:f388:d:1::1001 ntp1.doit.wisc.edu has IPv6 address 2607:f388::123:1 ntp-animal-226-1-mgmt.net.wisc.edu has address 18.104.22.168 (aka ntp2.doit.wisc.edu) ntp-animal-226-1-mgmt.net.wisc.edu has IPv6 address 2607:f388:d:2::1001 ntp2.doit.wisc.edu has IPv6 address 2607:f388::123:2 ntp-432nm-b3a-1-mgmt.net.wisc.edu has address 22.214.171.124 ntp-432nm-b3a-1-mgmt.net.wisc.edu has IPv6 address 2607:f388:d::1002 ntp3.doit.wisc.edu has IPv6 address 2607:f388::123:3