DNS & Network tools · FREE
See the heart of the DNS zone.
Enter a domain to see its SOA record — primary nameserver, serial and zone synchronization timers.
About this tool
The SOA (Start of Authority) record holds the core details of every DNS zone: the primary nameserver, the admin email, a serial number (which must increase on every change), and the refresh, retry and expire intervals. This record is essential for syncing primary and secondary nameservers.
Frequently asked questions
What is an SOA record?
The base record of every zone that defines DNS authority and synchronization parameters.
What is the SOA serial for?
It's the zone's version; secondary nameservers see a higher serial and know to update.
How many SOA records per zone?
Exactly one; the SOA is always the first record of a zone.
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