[bitfolk] Best way to go about moving about 15 domains

Hi Guys, I've recently come into possession of a relatively small hosting company and I'm trying to move the ~15 or so domains to Bitfolk, the set up they have now is as follows: -1 server with 5 IP addresses -A main domain name registered with GoDaddy, with an NS1 host and NS1 A record pointing to one of the IP addresses, and an NS2 host and A record pointing to another IP address All the domains they host are then pointed to ns1 and ns2 on the main domain via nameservers. I think I need to just move the main domain, but will I need two IP addresses for this or can ns1 and ns2 point to the same IP? Daniel