Changing the Nameserver IP address in WHM

If the client gets  the Nameserver IP addresses  from the Main >> DNS Functions >> Nameserver IPs as
For  Example:
Nameserver    IP         No. Zones
ns1.localhost.com    64.99.64.32    80
ns2.localhost.com    64.99.64.32    80

From WHM to change them you can it from

Main >> Server Configuration >> Basic cPanel & WHM Setup >> Nameservers

 From the shell you can change it with the below mentioned process

#vi /etc/nameserverips
64.99.64.32=ns1.localhost.com
64.99.64.32=ns2.localhost.com
change it to the appropriate IP address and Local host.
:wq!

 Then access the file /var/cpanel/nameserverips.yaml

#vi /var/cpanel/nameserverips.yaml
Replace the appropriate nameservers and the IP address.

After that restart the service
#service named restart OR #/etc/init.d/named restart
#service cpanel restart OR #/etc/init.d/cpanel restart

Check for the changes in the Nameserver IPs of the WHM.