Question and response
Question
dig mail.iristel.io. NS
Answer
mail.iristel.io. 5 CNAME mail.iristel.com.
Authority
iristel.com. 10800 SOA pdns104.ultradns.com. tldadmin.iristel.com. 2020063474 86400 86400 86400 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0