Apex domains cannot have CNAME records.
Question and response
Question
dig nforce.com. NS
Answer
nforce.com. 5 NS ns2.dbn.nforce.nl.
nforce.com. 5 NS ns1.dbn.nforce.nl.
nforce.com. 5 NS ns3.nforce.com.
Authority
The response has no authority records.
Additional
ns1.dbn.nforce.nl. 5 A 77.247.176.114
ns2.dbn.nforce.nl. 5 A 77.247.176.115
ns3.nforce.com. 5 A 85.159.238.17
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0