I have a dedicated Linux server with cPanel.

When I received this server I created the two nameservers, ns1.domain.com and ns2.domain.com. I then registered these two nameservers with the registrar and everything works fine.

I would like to create another two nameservers. I registered these two nameservers as ns3.domain.com and ns4.domain.com. All 4 nameservers are now on the same server. They all include the name domain.com.

I used the site dnsstuff.com to do a dns lookup. It can lookup ns1.domain.com and ns2.domain.com, but is unable to lookup ns3.domain.com and ns4.domain.com. But all nameservers show up in 'Manage Nameservers IPs' under the whm.

Am I able to create all 4 nameservers using the name domain.com on a single server?

Quick question... why do you want 4 name servers on one server?

Actually I have defined 6 nameservers, but I just used 4 as the example.

The reason for this madness, is that later I wish to have 3 dedictated servers. I will then move the pair of nameservers to each of the other two servers.

You have to edit the DNS zone file for domain.com on your server and add A entry for all nameservers.

ns3 --- A --- xxx.xxx.xxx.xxx
ns4 --- A --- xxx.xxx.xxx.xxx

and so on.