avcr.cz CNAME records

CNAME Canonical name
Apex domains cannot have CNAME records.

Question and response

Question

dig avcr.cz. NS

Answer

avcr.cz. 4 NS visla.utia.cas.cz. avcr.cz. 4 NS academy.cas.cz. avcr.cz. 4 NS nsa.ces.net.

Authority

The response has no authority records.

Additional

nsa.ces.net. 1 A 195.113.144.205 nsa.ces.net. 1 AAAA 2001:718:1:1:0:0:144:205 . 0 OPT ; payload 1232, xrcode 0, version 0, flags 0