They wont be valid after the XLhost machine is down (it's still running).

It's moved over using the DNS on the Xlhost machine.  I can change the IP of the domain all I want from the DNS server (we've done this before).  But this worked before because we've always had the IP 209.190.24.34 available (which will not be available when we cancel the machine at XLhost).

The problem is that NS1 and NS2 are mapped to IPs at XLhost.  And this mapping is on the domain's side and something we need to change through Zbox.  If we can't do this then we need to use dfbgaming.com and change all the domains.