Apex domains cannot have CNAME records.
Question and response
Question
dig 229.129.98.in-addr.arpa. NS
Answer
229.129.98.in-addr.arpa. 5 NS ns1.liquidweb.com.
229.129.98.in-addr.arpa. 5 NS ns.liquidweb.com.
Authority
The response has no authority records.
Additional
ns.liquidweb.com. 5 A 69.16.222.254
ns1.liquidweb.com. 5 A 69.16.223.254
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0