Nameservers respond over UDP
ns.udp
UDP port 53 is how essentially every DNS query arrives.
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 respond over UDP 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
- Nameservers are independent of each other
- 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
- Zone transfers are not open to the world