Apex domains cannot have CNAME records.
Question and response
Question
dig routit.net. NS
Answer
routit.net. 5 NS auth02-peer.ib.routit.net.
routit.net. 5 NS auth01-peer.ib.routit.net.
Authority
The response has no authority records.
Additional
auth01-peer.ib.routit.net. 5 A 213.144.232.181
auth02-peer.ib.routit.net. 5 A 213.144.232.182
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0