SOA Record Lookup — the master record for any DNS zone.

Authoritative query. Every field decoded — no BIND-format cryptic dumps.

• Zone-transfer diagnostics If secondaries aren't updating, compare serial numbers between primary and secondary. If they match, replication is working; if primary is higher, the secondary can't reach the primary.
• Zone-edit forensics The serial number in YYYYMMDDNN format tells you exactly when the zone was last edited. Useful for correlating with incident timelines.
• Nameserver-migration verification After migrating DNS to a new host, confirm the SOA reflects the new provider (primary NS + admin email should update).
• TTL-planning reference The minimum TTL field is the negative-cache TTL — critical when you're planning to delete a record and want to know how long resolvers will remember it's gone.
• Registrar-level troubleshooting When something's broken at the registry level, the SOA is the first record to check — an incorrect MNAME can cause propagation issues across the zone.

• What is an SOA record? The master record for a DNS zone. Names the primary authoritative server, the zone administrator's email, a serial number tracking zone-file version, and four timing fields for zone replication. Every zone must have exactly one SOA at the apex.
• What does the serial number do? Secondaries poll the primary and compare serial numbers. If the primary's serial is higher, secondaries pull a fresh copy of the zone. Every edit must bump the serial monotonically or replication won't trigger.
• Why is the admin email in dot format? The DNS SOA format uses `.` as the local-part separator instead of `@` — a hangover from BIND zone-file syntax where `@` means 'current origin'. Tools should convert on display.
• What's the difference between refresh and retry? `refresh` = normal poll interval (seconds). `retry` = the wait after a failed poll before retrying — typically shorter than refresh so you catch primaries recovering quickly.
• Is SOA the same as NS? No. SOA names the primary and defines zone timing. NS lists every authoritative server (primary + all secondaries). Both are mandatory at the zone apex.