4 Nameservers, 2 IP's?

Well, I'm just trying to figure out if it's possible to have 4 nameservers pointing at 2 IP addresses. Such as:

ns1.mydomain.com -> IPaddress1
ns2.mydomain.com -> IPaddress2
ns1.hisdomain.com -> IPaddress1
ns2.hisdomain.com -> IPaddress2

I'm asking because if it's possible to do this, then I don't really see the need to have any extra IP's allocated to a machine. If anybody can help me with this, I'd greatly appreciate it.

Thanks

 

 

 

 

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