Apex domains cannot have CNAME records.
Question and response
Question
dig zoomtown.com. NS
Answer
zoomtown.com. 5 NS ns2.fuse.net.
zoomtown.com. 5 NS ns1.fuse.net.
Authority
The response has no authority records.
Additional
ns1.fuse.net. 5 A 216.68.8.10
ns2.fuse.net. 5 A 216.68.208.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0