A little command line tool to check if your DNS servers are in sync.
$ dnscheck check --host github.com
2021/06/11 11:08:31 Discovered local resolver: 192.168.178.1:53
2021/06/11 11:08:31 Probing for NS records (nameservers) for github.com
2021/06/11 11:08:31 => host: github.com
2021/06/11 11:08:31 Found 8 nameservers for github.com.
+-------------------------+-----+------+--------------+
| NS | TTL | TYPE | DATA |
+-------------------------+-----+------+--------------+
| dns1.p08.nsone.net | 60 | A | 140.82.121.4 |
| dns2.p08.nsone.net | 60 | A | 140.82.121.4 |
| dns3.p08.nsone.net | 60 | A | 140.82.121.4 |
| dns4.p08.nsone.net | 60 | A | 140.82.121.4 |
| ns-421.awsdns-52.com | 60 | A | 140.82.121.4 |
| ns-520.awsdns-01.net | 60 | A | 140.82.121.3 |
| ns-1283.awsdns-32.org | 60 | A | 140.82.121.4 |
| ns-1707.awsdns-21.co.uk | 60 | A | 140.82.121.4 |
+-------------------------+-----+------+--------------+Simplified BSD License