DNS hosting: see when your change has arrived everywhere

The zone view has a new Propagation column: every record shows whether your latest change has reached the big public resolvers – measured against about a dozen operators, including Cloudflare, Google, Quad9 and OpenDNS, plus dremaxx's own resolvers.

Three states

• Still propagating – some resolvers are still handing out the previous value. That is normal while their cache is running; the remaining time is shown next to each resolver.
• Fully propagated – every checked resolver serves the current value.
• Diverged – a resolver is behind for longer than the record's TTL can explain. That is no longer caching but a finding worth looking into – and exactly the case this column exists for.

Frugal by construction. A resolver's answer says itself how long it remains valid: it carries a counting-down TTL. So a record is only re-queried once its answer could have changed at all – a record nobody touches costs no DNS traffic whatsoever, however often the page is open. For newly created names the negative caching with which resolvers remembered “does not exist” is taken into account as well. Check now measures any record immediately.

The status is kept for the types A, AAAA, CNAME, MX, TXT, NS, SRV and CAA – everything one changes and then watches.