Apex domains cannot have CNAME records.
Question and response
Question
dig nic.in. NS
Answer
nic.in. 4 NS ns6.nic.in.
nic.in. 4 NS ns8.nic.in.
nic.in. 4 NS nicnet.nic.in.
nic.in. 4 NS ns4.nic.in.
Authority
The response has no authority records.
Additional
ns4.nic.in. 4 A 164.100.11.2
ns6.nic.in. 4 A 164.100.4.2
nicnet.nic.in. 4 A 164.100.105.105
ns8.nic.in. 4 AAAA 2001:4408:10:0:0:0:0:11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0