> new DNS records are actually available instantly This isn't quite correct - NXDOMAIN responses can be cached, so if you create a new record, and you've alrea

> new DNS records are actually available instantly This isn't quite correct - NXDOMAIN responses can be cached, so if you create a new record, and you've already queried for it, you might get a cached response. In BIND, this is configured as a NXDOMAIN cache on the SOA record for the zone, but that's an implementation detail.