thunder-bird.biz CNAME records

CNAME Canonical name
Apex domains cannot have CNAME records.

Question and response

Question

dig thunder-bird.biz. NS

Answer

thunder-bird.biz. 5 NS ns2.thunder-bird.biz. thunder-bird.biz. 5 NS ns1.thunder-bird.biz.

Authority

The response has no authority records.

Additional

ns1.thunder-bird.biz. 5 A 163.5.51.247 ns2.thunder-bird.biz. 5 A 209.212.157.211 . 0 OPT ; payload 1232, xrcode 0, version 0, flags 0