sysorb0.dk-co.off.keepit.com has no CNAME records.
Question and response
Question
dig sysorb0.dk-co.off.keepit.com. NS
Answer
The response has no answer records.
Authority
keepit.com. 10653 SOA pns41.cloudns.net. hostmaster.keepit.com. 2026022349 43200 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0