es.colt.net CNAME records

CNAME Canonical name
Apex domains cannot have CNAME records.

Question and response

Question

dig es.colt.net. NS

Answer

es.colt.net. 5 NS ns1.es.colt.net. es.colt.net. 5 NS ns0.es.colt.net.

Authority

The response has no authority records.

Additional

ns0.es.colt.net. 5 A 212.74.78.39 ns1.es.colt.net. 5 A 212.74.77.39 . 0 OPT ; payload 1232, xrcode 0, version 0, flags 0