I have previously used the cloudflare but due to technical issue i have to change the dns. I again tried to use the name server but it does not worked. The name server is still not recognized untill 24 hours. Please help
Although you may have set the nameservers correctly yourself, as @cscharff says, your domain registrar has not set them correctly at the .np registry where they are… lynn.ns.cloudflare.com ns2.nepalcloudhost.com
Doing DNS lookups may show the 2 Cloudflare nameservers as the one Cloudflare nameserver will return them, but your zone won’t go active on Cloudflare until the delegation at the registry is correct. Only your registrar can fix this.
dig +trace +nodnssec sudipbaral.com.np ns
; <<>> DiG 9.10.6 <<>> +trace +nodnssec sudipbaral.com.np ns
;; global options: +cmd
. 511578 IN NS a.root-servers.net.
....
. 511578 IN NS m.root-servers.net.
;; Received 239 bytes from 127.0.2.2#53(127.0.2.2) in 14 ms
np. 172800 IN NS np.cctld.authdns.ripe.net.
np. 172800 IN NS ns4.apnic.net.
np. 172800 IN NS pch.nnic.np.
np. 172800 IN NS np-ns.npix.net.np.
np. 172800 IN NS shikhar.mos.com.np.
;; Received 351 bytes from 192.58.128.30#53(j.root-servers.net) in 49 ms
sudipbaral.com.np. 86400 IN NS lynn.ns.cloudflare.com.
sudipbaral.com.np. 86400 IN NS ns2.nepalcloudhost.com. <<<<< PROBLEM IS HERE
;; Received 118 bytes from 2001:dd8:12::53#53(ns4.apnic.net) in 173 ms
sudipbaral.com.np. 86400 IN NS harlee.ns.cloudflare.com.
sudipbaral.com.np. 86400 IN NS lynn.ns.cloudflare.com.
;; Received 103 bytes from 2803:f800:50::6ca2:c1c9#53(lynn.ns.cloudflare.com) in 16 ms