DNS record field guide
How to read a SOA record check
The SOA record describes the primary authority and timing parameters for a DNS zone.
When to use this lookup
Use the serial to confirm that secondary nameservers received a zone update and inspect the negative caching policy during NXDOMAIN troubleshooting.
Example
ns1.example.net hostmaster.example.net 2026082801 …
- Answer shape
- Primary nameserver, responsible mailbox, serial, refresh, retry, expire and negative-cache timing values.
- Common failure
- The serial was not increased, so secondary nameservers continue serving an older zone version.
- Related checks
- NS record
Troubleshooting checklist
- Increase the serial whenever a traditional secondary must transfer a changed zone.
- Compare SOA answers directly at each authoritative server when secondaries disagree.
- Negative answers can remain cached according to SOA-derived timing.