Question and response
Question
dig smtp02.sip.is. NS
Answer
smtp02.sip.is. 5 CNAME smtp.sip.is.
Authority
sip.is. 2560 SOA ns01.ns.sip.is. hostmaster.sip.is. 1773238800 16384 2048 1048576 2560
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0