Has it arrived yet?
Ask six public resolvers and the domain’s name servers at once, and compare.
Reading the board
- Updated
- Matches the source.
- Old value
- Still holds the old answer until the TTL runs out.
- Not found
- Says no record exists. That is cached too.
- Error
- No proper answer. Never counted as missing.
What it cannot see
Each resolver keeps its answer until the TTL runs out, so the TTL is its upper limit. Stamp asks from one server, so anycast sites and your provider's resolver may differ.