Apex domains cannot have CNAME records.
Question and response
Question
dig signicat.net. NS
Answer
signicat.net. 5 NS ns-481.awsdns-60.com.
signicat.net. 5 NS ns-1968.awsdns-54.co.uk.
signicat.net. 5 NS ns-1045.awsdns-02.org.
signicat.net. 5 NS ns-995.awsdns-60.net.
Authority
The response has no authority records.
Additional
ns-481.awsdns-60.com. 3 A 205.251.193.225
ns-1045.awsdns-02.org. 3 A 205.251.196.21
ns-1968.awsdns-54.co.uk. 3 A 205.251.199.176
ns-481.awsdns-60.com. 3 AAAA 2600:9000:5301:e100:0:0:0:1
ns-995.awsdns-60.net. 3 AAAA 2600:9000:5303:e300:0:0:0:1
ns-1045.awsdns-02.org. 3 AAAA 2600:9000:5304:1500:0:0:0:1
ns-1968.awsdns-54.co.uk. 3 AAAA 2600:9000:5307:b000:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0