hostblaster.sunet.se has no CNAME records.
Question and response
Question
dig hostblaster.sunet.se. NS
Answer
The response has no answer records.
Authority
sunet.se. 300 SOA hidden-master.sunet.se. hostmaster.sunet.se. 2026022701 14400 3600 864000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0