proofpoint.com CNAME DNS records

CNAME Canonical name

Apex domains cannot have CNAME records.

Question and response

Question

dig proofpoint.com. NS

Answer

proofpoint.com. 5 NS pdns99.ultradns.com. proofpoint.com. 5 NS pdns99.ultradns.biz. proofpoint.com. 5 NS ns1.proofpoint.com. proofpoint.com. 5 NS ns3.proofpoint.com. proofpoint.com. 5 NS pdns99.ultradns.org. proofpoint.com. 5 NS pdns99.ultradns.net.

Authority

The response has no authority records.

Additional

ns1.proofpoint.com. 5 A 208.84.67.208 ns3.proofpoint.com. 5 A 208.84.66.208 ns1.proofpoint.com. 5 AAAA 2620:100:9000:1:0:0:0:d0 ns3.proofpoint.com. 5 AAAA 2620:100:9004:1:0:0:0:d0 . 0 OPT ; payload 1232, xrcode 0, version 0, flags 0