sys.kth.se CNAME records

CNAME Canonical name
Apex domains cannot have CNAME records.

Question and response

Question

dig sys.kth.se. NS

Answer

sys.kth.se. 5 NS b.ns.kth.se. sys.kth.se. 5 NS e.ns.kth.se. sys.kth.se. 5 NS a.ns.kth.se.

Authority

The response has no authority records.

Additional

a.ns.kth.se. 3 A 130.237.72.246 b.ns.kth.se. 3 A 130.237.72.250 a.ns.kth.se. 3 AAAA 2001:6b0:1:0:0:0:0:246 b.ns.kth.se. 3 AAAA 2001:6b0:1:0:0:0:0:250 . 0 OPT ; payload 1232, xrcode 0, version 0, flags 0