Question and response
Question
dig mx.plsspb.ru. NS
Answer
mx.plsspb.ru. 4 CNAME cdr.plsspb.ru.plsspb.ru.
Authority
plsspb.ru. 324 SOA plsspb.ru. admin.plsspb.ru. 20 604800 86400 2419200 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0