b.dns.tele2.net has no CNAME records.
Question and response
Question
dig b.dns.tele2.net. NS
Answer
The response has no answer records.
Authority
tele2.net. 3600 SOA kista.dns.swip.net. registry.swip.net. 2026046197 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0