server.colt.net CNAME records

CNAME Canonical name
Apex domains cannot have CNAME records.

Question and response

Question

dig server.colt.net. NS

Answer

server.colt.net. 5 NS ns20.colt.net. server.colt.net. 5 NS ns21.colt.net.

Authority

The response has no authority records.

Additional

ns20.colt.net. 5 A 213.41.0.232 ns21.colt.net. 5 A 213.185.161.68 . 0 OPT ; payload 1232, xrcode 0, version 0, flags 0