What is it?
This DNS finding means the domain did not return nameserver records. NS records identify the authoritative DNS servers for a zone.
Why does it matter?
Without correct NS records, recursive resolvers may not be able to find the authoritative DNS for the domain. Even if some cached answers still exist, resolution can become unreliable as TTLs expire.
How to fix it?
Configure at least two authoritative nameservers at your DNS provider and make sure the registrar delegation matches the zone.
example.com. 3600 IN NS ns1.provider.example.
example.com. 3600 IN NS ns2.provider.example.Query both the parent delegation and the authoritative zone. The active nameserver set should match unless you are in a planned migration window.