| Domain | Date |
| 0.centos.pool.ntp.org | 2019-08-08 |
| 0.nettime.pool.ntp.org | 2019-06-30 |
| 0.amazon.pool.ntp.org | 2019-06-24 |
| 0.us.pool.ntp.org | 2019-06-22 |
| 3.pool.ntp.org | 2019-06-10 |
| 3.us.pool.ntp.org | 2019-05-31 |
| 1.nettime.pool.ntp.org | 2019-05-13 |
| 3.amazon.pool.ntp.org | 2019-04-13 |
| 2.pool.ntp.org | 2019-04-05 |
| time.musixmatch.com | 2019-02-25 |
| t1.hshh.org | 2018-12-11 |
| 0.datadog.pool.ntp.org | 2018-11-22 |
| 0.lede.pool.ntp.org | 2018-07-06 |