Nameservers are independent of each other
ns.diversity
Two nameservers in the same rack fail together. Diversity is what makes a second nameserver actually redundant rather than decorative.
A longer write-up of this check has not been published yet. The report itself shows the raw evidence behind every result, which is usually the fastest way to see what was measured.
Run this check on a domain
Nameservers are independent of each other is one of 49 checks in every report, alongside delegation, mail authentication, TLS and registration.
Also in Nameservers
- Every nameserver is authoritative
- At least two nameservers
- Nameserver hostnames are valid
- IPv6 reachability
- Nameservers are not open resolvers
- Nameservers agree on the SOA serial
- Nameservers agree on the NS set
- Nameservers respond over TCP
- Nameservers respond over UDP
- Zone transfers are not open to the world