s-91-193-35-77.under.net.ua has no NS records.
NS records for this zone are defined at under.net.ua.
NS records for this zone are defined at under.net.ua.
Question and response
Question
dig s-91-193-35-77.under.net.ua. NS
Answer
The response has no answer records.
Authority
under.net.ua. 1800 SOA kobe.ns.cloudflare.com. dns.cloudflare.com. 2399660688 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0