_spf.webex.com CNAME records

CNAME Canonical name
Apex domains cannot have CNAME records.

Question and response

Question

dig _spf.webex.com. NS

Answer

_spf.webex.com. 5 NS ns2.as13445.net. _spf.webex.com. 5 NS ns1.as13445.net.

Authority

The response has no authority records.

Additional

ns1.as13445.net. 4 A 66.163.52.1 ns2.as13445.net. 4 A 66.163.53.1 . 0 OPT ; payload 1232, xrcode 0, version 0, flags 0