Do your nameservers agree?
We ask every nameserver for your zone directly for its SOA record and lay the answers side by side — so after a DNS change you can see whether the world has heard.
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Questions
What does it mean when nameservers disagree?
Each nameserver hands out the SOA serial of the copy of the zone it holds. If one returns a lower serial than the others, it hasn't picked up your latest change yet, so some visitors still get the old records. The refresh and retry values tell you how often it tries to catch up.
How can a serial tell me when the zone was last edited?
Many operators follow the RFC 1912 convention YYYYMMDDnn: 2024031102 means the second edit on 11 March 2024. Some providers use a Unix timestamp instead. Route 53 keeps the serial at 1 and others use a plain counter; those zones keep no diary, and the checker says so.
What is the expire value?
Expire is how long a secondary nameserver keeps answering for the zone after it last reached the primary. If the primary vanished right now, that is when the secondaries would go silent. The checker shows it as a clock time.
Why does the negative-caching TTL matter?
The last SOA field (RFC 2308) sets how long resolvers remember that a name does not exist. If it is a day, a record you add now can stay "not found" for a day for anyone who asked before. An hour or less is the usual advice.