Apex domains cannot have CNAME records.
Question and response
Question
dig as8607.net. NS
Answer
as8607.net. 5 NS ns102.dns.as8607.com.
as8607.net. 5 NS ns103.dns.as8607.org.
as8607.net. 5 NS ns104.dns.as8607.co.uk.
as8607.net. 5 NS ns101.dns.as8607.net.
Authority
The response has no authority records.
Additional
ns101.dns.as8607.net. 5 A 205.251.195.214
ns101.dns.as8607.net. 5 AAAA 2600:9000:5303:d600:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0