Question and response
Question
dig _acme-challenge.msk.ru.itoolabs.net. DS
Answer
_acme-challenge.msk.ru.itoolabs.net. 5 CNAME acme-challenge.msk.ru.itoolabs.net.
Authority
msk.ru.itoolabs.net. 600 SOA dns1.itoolabs.net. noc.itoolabs.net. 2026020501 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0