SOA Record Lookup — Free & Instant

About this tool. The SOA record is the birth certificate of a DNS zone: which server is primary, who administers it, and a serial number that changes on every edit. Comparing serials is the classic way to spot stale secondary servers or confirm a change has published.

Ten signals decide whether your mail arrives. You just checked one.

The serial is the version counter for your zone. If it does not increase after a change, secondaries keep serving the old record and your fix never takes effect.

SPF, DKIM, DMARC, MX and blocklist status, graded A to F in one pass
Every problem written out in plain English, with the record to publish
Saved under Reports, so you can re-run it and see what changed
One domain watched against the blocklists daily

Run the full checkup free

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How to read your SOA Record results

The SOA record holds the zone's primary nameserver, the responsible contact, a serial number, and the refresh and expiry timers.
The serial number should increase every time you change the zone. Secondary servers use it to know when to update.

Common problems and how to fix them

Secondary nameservers are out of date

Confirm the serial number increments on each change. If it does not, secondaries never pull the update.

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Common questions.

What is an SOA record?

The Start of Authority record. It defines administrative details for a DNS zone, including its serial number and timing values.

What is the SOA serial number?

A version counter for the zone. It must increase on every change so secondary servers know to refresh.