Apex domains cannot have CNAME records.
Question and response
Question
dig arrow.net.do. NS
Answer
arrow.net.do. 5 NS pdns77.ultradns.net.
arrow.net.do. 5 NS pdns77.ultradns.com.
arrow.net.do. 5 NS pdns77.ultradns.biz.
arrow.net.do. 5 NS pdns77.ultradns.org.
Authority
The response has no authority records.
Additional
pdns77.ultradns.biz. 4 A 156.154.66.77
pdns77.ultradns.com. 4 A 156.154.64.77
pdns77.ultradns.net. 4 A 156.154.65.77
pdns77.ultradns.org. 4 A 156.154.67.77
pdns77.ultradns.biz. 4 AAAA 2610:a1:1015:0:0:0:0:71
pdns77.ultradns.com. 4 AAAA 2001:502:f3ff:0:0:0:0:71
pdns77.ultradns.net. 4 AAAA 2610:a1:1014:0:0:0:0:71
pdns77.ultradns.org. 4 AAAA 2001:502:4612:0:0:0:0:71
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0