Here is popular list of public NTP server IP address
time-a.nist.gov (129.6.15.28)
time-b.nist.gov (129.6.15.29)
time-b.nist.gov (129.6.15.30)
time.windows.com (207.46.232.182)
ntp.asql.co.uk (82.68.206.125)
chronos.csr.net (194.35.252.5)
time.nist.gov (192.43.244.18)
https://tf.nist.gov/tf-cgi/servers.cgi
http://www.ntp.org.
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