mail.INTEGRACIO.RU has no NS records.
NS records for this zone are defined at INTEGRACIO.RU.
NS records for this zone are defined at INTEGRACIO.RU.
Question and response
Question
dig mail.INTEGRACIO.RU. NS
Answer
The response has no answer records.
Authority
INTEGRACIO.RU. 3600 SOA ns1.reg.RU. hostmaster.ns1.reg.RU. 1766605492 14400 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0