SOA Record Look Up
Related tools
What this is
The SOA (Start of Authority) record carries the zone's administrative metadata: the primary nameserver, the responsible contact, a serial number that increments with every change, and the timers that control how secondary servers refresh and how long negative answers are cached.
How to read your result
You rarely need to act on SOA values directly. The serial number is the most useful field: comparing it across nameservers tells you whether they are in sync. Sane timer defaults are fine for almost everyone.
Common problems and how to fix them
Serial number differs between nameservers
How it shows up: Some users get updated records while others get stale ones for far longer than the TTL explains.
How to fix it: A secondary server is failing to transfer the zone from the primary. Check zone-transfer (AXFR/IXFR) settings and connectivity between the servers, or let your managed DNS provider know — with managed DNS this should never happen.
Negative-cache TTL (minimum) set very high
How it shows up: After adding a brand-new record, resolvers that already asked for it keep answering "does not exist" for hours.
How to fix it: Lower the SOA minimum/negative-TTL field to something like 300–3600 seconds so mistakes and new records recover quickly.
Related reading
- DNS Record Types, ExplainedA practical tour of every DNS record you will actually touch — A, AAAA, CNAME, MX, TXT, SRV, CAA, the DNSSEC set and the modern HTTPS record — with syntax, gotchas and when to reach for each.
- Reading a Domain in One Pass: A Guide to Full DNS Record LookupsSee every DNS record for a domain at once - A, MX, TXT, SPF, DMARC, CNAME, NS, SOA, CAA, SRV and WHOIS - and learn what each one actually does.
Frequently asked questions
- What is an SOA record?
- The Start of Authority (SOA) record is a mandatory DNS record that marks the beginning of a zone and holds administrative details about it. It names the primary nameserver, the responsible admin's email, a serial number, and the timers that control how the zone is refreshed and cached.
- How do I use this SOA lookup tool?
- Enter a domain name and run the lookup; the tool queries the domain's SOA record server-side and displays each field in a readable form. Nothing you type is stored, and there is no sign-up required.
- Why does the SOA record matter?
- Its serial number tells secondary nameservers when the zone has changed and needs to be re-synced, so a stale serial can leave slaves serving outdated data. The minimum TTL field also governs how long negative (NXDOMAIN) answers are cached by resolvers.
- How do I read the serial, refresh, retry, expire and minimum values?
- The serial should increase on every zone edit (many admins use the YYYYMMDDnn date format); refresh, retry and expire are seconds that tell secondaries how often to check, retry, and when to stop answering if the primary is unreachable. The minimum value is the TTL applied to negative responses.
- Why do I see only one SOA record per zone?
- A zone can have exactly one SOA record, always at the zone apex, so this lookup returns a single result even for large domains. If you query a subdomain that is not its own delegated zone, you will see the parent zone's SOA rather than a separate one.