ns2.uio.no has no CNAME records.
Question and response
Question
dig ns2.uio.no. NS
Answer
The response has no answer records.
Authority
uio.no. 10800 SOA ns1.uio.no. hostmaster.uio.no. 3260306007 10800 3600 1814400 43200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0