Hi,
This issue is related to your DHCP and DNS server. Not a lot you can do from your end, without the help of the system administrator in charge of those servers. The DHCP server should be informing the DNS server of the hostnames that register, so they become accessible by hostname.
Alternatively, if your system administrator won't help, look at Avahi, ".local" addresses.
Open a Terminal, and type:
avahi-browse -a
Or try pinging one of your ubermix systems name, followed by ".local".