dns10.telia.com has no CNAME records.
Question and response
Question
dig dns10.telia.com. NS
Answer
The response has no answer records.
Authority
telia.com. 520 SOA dns1.telia.com. backbone.telia.net. 2026022700 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0