mail.CONTELL.RU has no NS records.
NS records for this zone are defined at CONTELL.RU.
NS records for this zone are defined at CONTELL.RU.
Question and response
Question
dig mail.CONTELL.RU. NS
Answer
The response has no answer records.
Authority
CONTELL.RU. 1800 SOA lola.ns.cloudflare.com. dns.cloudflare.com. 2397186776 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0