Apex domains cannot have CNAME records.
Question and response
Question
dig ltd. NS
Answer
ltd. 3 NS v2n1.nic.ltd.
ltd. 3 NS v0n0.nic.ltd.
ltd. 3 NS v0n3.nic.ltd.
ltd. 3 NS v0n1.nic.ltd.
ltd. 3 NS v0n2.nic.ltd.
ltd. 3 NS v2n0.nic.ltd.
Authority
The response has no authority records.
Additional
v0n0.nic.ltd. 84121 A 65.22.28.2
v0n1.nic.ltd. 84121 A 65.22.29.2
v0n2.nic.ltd. 84121 A 65.22.30.2
v0n3.nic.ltd. 84121 A 161.232.14.2
v2n0.nic.ltd. 84121 A 65.22.31.2
v2n1.nic.ltd. 84121 A 161.232.15.2
v0n0.nic.ltd. 84121 AAAA 2a01:8840:1e:0:0:0:0:2
v0n1.nic.ltd. 84121 AAAA 2a01:8840:1f:0:0:0:0:2
v0n2.nic.ltd. 84121 AAAA 2a01:8840:20:0:0:0:0:2
v0n3.nic.ltd. 84121 AAAA 2a01:8840:f8:0:0:0:0:2
v2n0.nic.ltd. 84121 AAAA 2a01:8840:21:0:0:0:0:2
v2n1.nic.ltd. 84121 AAAA 2a01:8840:f9:0:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0