Don't have an account? Sign up
If you're already signed up, please sign in
SOA Serial — the unsigned 32-bit zone version number in an SOA record that secondary servers compare to decide whether a transfer is needed.
DNS is a distributed hierarchy. A resolver starts with available data and, when necessary, queries root, TLD, and authoritative servers. TTL-based caching reduces query volume but delays the visibility of changes.
SOA Serial — the unsigned 32-bit zone version number in an SOA record that secondary servers compare to decide whether a transfer is needed.
This component participates in locating, storing, or returning authoritative data about domain names. Its role is determined by its place in the hierarchy and the type of DNS query.
Query the authoritative servers and a recursive resolver separately. Compare the answer, TTL, delegation, and cache state to distinguish a zone error from stale client-side data.
