> вменяемый dig с трейсом покажи [root@dc-pfarm named]# dig mail.ru +trace
; <<>> DiG 9.9.4-RedHat-9.9.4-61.el7 <<>> mail.ru +trace
;; global options: +cmd
. 78052 IN NS m.root-servers.net.
. 78052 IN NS e.root-servers.net.
. 78052 IN NS a.root-servers.net.
. 78052 IN NS g.root-servers.net.
. 78052 IN NS d.root-servers.net.
. 78052 IN NS h.root-servers.net.
. 78052 IN NS j.root-servers.net.
. 78052 IN NS c.root-servers.net.
. 78052 IN NS l.root-servers.net.
. 78052 IN NS b.root-servers.net.
. 78052 IN NS k.root-servers.net.
. 78052 IN NS f.root-servers.net.
. 78052 IN NS i.root-servers.net.
;; Received 447 bytes from 127.0.0.1#53(127.0.0.1) in 2 ms
ru. 172800 IN NS d.dns.ripn.net.
ru. 172800 IN NS e.dns.ripn.net.
ru. 172800 IN NS b.dns.ripn.net.
ru. 172800 IN NS f.dns.ripn.net.
ru. 172800 IN NS a.dns.ripn.net.
ru. 86400 IN DS 33094 8 2 7228B0DCE8E4DEDA575C7DB69CBF55C43FCCC4BB60FBCC717DDABED1 D17338E1
ru. 86400 IN RRSIG DS 8 1 86400 20180902050000 20180820040000 41656 . lS59an08eCf30SZsHILZaPNgCn3Bp97tYuO1Dh0PBufUmd2e5o+eNCSc X3lYTADxZn2aKeuzP31lFW7x3Y66D95TzQnbVPDoWV50BTW76XGsJk82 3KWMZqxC9FjAUfVR6sdIwhXa0+R65sa7Lv5vVhKxdlgN8gVTTRH0MJ/4 QhGDkNV/UBYPOm4juKwDIE6VPz60bqMZG79gEb7P2rFC8GfYgv0SoFNV ryeHKGVUmEbVnpLL936NLhzwzvtDxqha6pHRCWWWNAzElTXVYuCYbfDq UMgZeN72qJuL0eaxJggpcCwq5PmC03zPVw9REsY63YIJ0pWu68Ji9VGT x6dIug==
;; Received 683 bytes from 202.12.27.33#53(m.root-servers.net) in 202 ms
MAIL.RU. 345600 IN NS ns3.mail.RU.
MAIL.RU. 345600 IN NS ns2.mail.RU.
MAIL.RU. 345600 IN NS ns1.mail.RU.
TDUI9D4JKUDS8B9T86GJ39PGFLCNLGM5.RU. 3600 IN NSEC3 1 1 3 00FF TED22ISH171FE0V38AMLCSO58N4CVHBQ NS SOA RRSIG DNSKEY NSEC3PARAM
TDUI9D4JKUDS8B9T86GJ39PGFLCNLGM5.RU. 3600 IN RRSIG NSEC3 8 2 3600 20180907102143 20180802102129 52413 ru. oLvkzSzakNMK6P15bQYDG1GLMJhfEnbcEmzM8HHNftA96r42wOq/05Cb 8oN0RqYd+NMyhbU1Tn1kShG3ZR/A2if2GLdAUnZDPG90pffPM/HyiDdy VvQU4ml0X5HnCwOCzTZoUX7FWjMJ+d5vfDQSxs1EKZ5Mrjz+oKGiZPbu MXs=
TRSEDR39LBV5OP7A2Q7SA7AR85PDGCSB.RU. 3600 IN NSEC3 1 1 3 00FF TSGK5KJHNOOCQNSSGPM7273SCIROA193 NS DS RRSIG
TRSEDR39LBV5OP7A2Q7SA7AR85PDGCSB.RU. 3600 IN RRSIG NSEC3 8 2 3600 20180914205159 20180814082101 52413 ru. Hs83/s++FO57P6R6hVVBxTCyzD8HFINUxzmwUhEdZby2vudaAIWIMYIx 9royCZsZQTt9h2WMV8RS58yD1nZMyJMVKPORgM28cOt4H65CzpTOwhPF uCAGT63QpJdm6EI1iJ+SLh9Tqv+iw/3Ytvv9HDp5y8mR+MKnbuEsNdrm UBA=
;; Received 649 bytes from 193.232.156.17#53(f.dns.ripn.net) in 197 ms
mail.ru. 60 IN A 3.120.25.179
mail.ru. 300 IN NS ns3.mail.ru.
mail.ru. 300 IN NS ns1.mail.ru.
mail.ru. 300 IN NS ns2.mail.ru.
;; Received 238 bytes from 217.69.139.112#53(ns1.mail.RU) in 18 ms
вот что он выдал, весь текст