Apex domains cannot have CNAME records.
Question and response
Question
dig npix.net.np. NS
Answer
npix.net.np. 4 NS ns4.npix.net.np.
npix.net.np. 4 NS ns3.npix.net.np.
npix.net.np. 4 NS ns1.npix.net.np.
npix.net.np. 4 NS ns2.npix.net.np.
Authority
The response has no authority records.
Additional
ns1.npix.net.np. 4 A 204.61.215.166
ns2.npix.net.np. 4 A 202.52.0.2
ns3.npix.net.np. 4 A 204.42.254.5
ns2.npix.net.np. 4 AAAA 2404:2c00:1:0:0:0:0:2
ns3.npix.net.np. 4 AAAA 2001:418:3f4:0:0:0:0:5
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0