ntp.aliyun.com
ntp1.aliyun.com
ntp2.aliyun.com
ntp3.aliyun.com
ntp4.aliyun.com
ntp5.aliyun.com
ntp6.aliyun.com
ntp7.aliyun.com
time.amazonaws.cn
time.izatcloud.net
time.xtracloud.net
ntp.tencent.com
ntp1.tencent.com
ntp2.tencent.com
ntp3.tencent.com
ntp4.tencent.com
ntp5.tencent.com
+.cn.pool.ntp.org
+.ntp.neu.edu.cn
+.ntp.ntsc.ac.cn
+.ntp.org.cn