mktomail.com CNAME records

CNAME Canonical name
Apex domains cannot have CNAME records.

Question and response

Question

dig mktomail.com. NS

Answer

mktomail.com. 4 NS ns1.marketo.com. mktomail.com. 4 NS ns2.mktdns.com.

Authority

The response has no authority records.

Additional

ns1.marketo.com. 4 A 199.15.213.1 ns2.mktdns.com. 4 A 199.15.215.252 . 0 OPT ; payload 1232, xrcode 0, version 0, flags 0