中国境内可以使用的NTP服务器的IP地址，和泰福特服务器的时间偏差值，泰福特时钟服务器实时连接天线，测试前已经连接天线超过72小时
time-a.nist.gov 129.6.15.28 NIST, Gaithersburg, Maryland offset 0.013798 sec
time-b.nist.gov 129.6.15.29 NIST, Gaithersburg, Maryland offset 0.013798 sec
time-a.timefreq.bldrdoc.gov 132.163.4.101 NIST, Boulder, Colorado offset 0.002842 sec
time-b.timefreq.bldrdoc.gov 132.163.4.102 NIST, Boulder, Colorado offset 0.002832 sec
time-c.timefreq.bldrdoc.gov 132.163.4.103 NIST, Boulder, Colorado offset -0.006157 sec
utcnist.colorado.edu 128.138.140.44 University of Colorado, Boulder offset -0.013504 sec
s2k.time.edu.cn CERNET桂林主节点 offset -0.005431 sec
time.asia.apple.com offset -0.001000 sec
time-nw.nist.gov offset -0.024988 sec
time-b.nist.gov offset 0.014072 sec
以下偏差值太大，不建议使用以下时钟源
ntp.sjtu.edu.cn 202.120.2.101 (上海交通大学网络中心NTP服务器地址）offset 0.048699 sec 丢包严重
time.windows.com offset -0.046836 sec