You also need to create child nameserver in domain control panel.
Login in domain control panel and create child nameserver / Glue record / hostname for these nameserver.
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First of all, make sure that nameservers for your domain are registered at domain registrar’s end. Now, you need to set/change child nameservers pointing to dedicated server IP address from your Domain registrar end. If you are aware about it, you can do it from domain management control panel. If you are not familiar with it, you can contact your domain registrar.
Now, you need to host the domain in dedicated server and need to set nameserver pointing to server IP address. Also, add A record entry for the same.
If you have done both of these tasks, please allow 24 to 48 hours, in order to propagate DNS records around the globe. Also, you can check DNS records from URL: http://intodns.com/domain_name
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Yes, You need to register your nameservers with your server IP address from domain registrar end. Once it is done, you need to add dns entry for that nameservers in your dns server. So that it would be working fine.