Apex domains cannot have CNAME records.
Question and response
Question
dig ap.iphmx.com. NS
Answer
ap.iphmx.com. 5 NS use1.akam.net.
ap.iphmx.com. 5 NS ns1-93.akam.net.
ap.iphmx.com. 5 NS ns1-109.akam.net.
ap.iphmx.com. 5 NS ns1-73.akam.net.
ap.iphmx.com. 5 NS ns1-90.akam.net.
ap.iphmx.com. 5 NS ns1-11.akam.net.
ap.iphmx.com. 5 NS asia3.akam.net.
ap.iphmx.com. 5 NS ns1-117.akam.net.
Authority
The response has no authority records.
Additional
use1.akam.net. 4 A 72.246.46.64
asia3.akam.net. 4 A 23.211.61.64
ns1-11.akam.net. 4 A 193.108.91.11
ns1-73.akam.net. 4 A 193.108.91.73
ns1-90.akam.net. 4 A 193.108.91.90
ns1-93.akam.net. 4 A 193.108.91.93
ns1-109.akam.net. 4 A 193.108.91.109
ns1-117.akam.net. 4 A 193.108.91.117
ns1-11.akam.net. 4 AAAA 2600:1401:2:0:0:0:0:b
ns1-73.akam.net. 4 AAAA 2600:1401:2:0:0:0:0:49
ns1-90.akam.net. 4 AAAA 2600:1401:2:0:0:0:0:5a
ns1-93.akam.net. 4 AAAA 2600:1401:2:0:0:0:0:5d
ns1-109.akam.net. 4 AAAA 2600:1401:2:0:0:0:0:6d
ns1-117.akam.net. 4 AAAA 2600:1401:2:0:0:0:0:75
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0