Apex domains cannot have CNAME records.
Question and response
Question
dig pyur.net. NS
Answer
pyur.net. 5 NS nspaut-m1-01.mip-platform.net.
pyur.net. 5 NS nspaut-l1-01.mip-platform.net.
pyur.net. 5 NS nspaut-b1-01.mip-platform.net.
Authority
The response has no authority records.
Additional
nspaut-b1-01.mip-platform.net. 5 A 62.117.5.20
nspaut-l1-01.mip-platform.net. 5 A 217.68.162.22
nspaut-m1-01.mip-platform.net. 5 A 195.234.128.144
nspaut-b1-01.mip-platform.net. 5 AAAA 2a02:2457:20c:101:0:0:0:17
nspaut-l1-01.mip-platform.net. 5 AAAA 2a02:2457:10c:101:0:0:0:1c
nspaut-m1-01.mip-platform.net. 5 AAAA 2a02:2457:30c:101:0:0:0:16
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0