Apex domains cannot have CNAME records.
Question and response
Question
dig midco.net. NS
Answer
midco.net. 4 NS dns4.midco.net.
midco.net. 4 NS dns3-rs.midco.net.
midco.net. 4 NS dns3-410.midco.net.
Authority
The response has no authority records.
Additional
dns3-rs.midco.net. 4 A 24.220.134.100
dns3-410.midco.net. 4 A 24.220.0.100
dns3-rs.midco.net. 4 AAAA 2001:48f8:80:0:24:220:134:100
dns3-410.midco.net. 4 AAAA 2001:48f8:11:0:24:220:0:100
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0