More complex activities and requirements Web site aliases It is of course perfectly fine to use a name allocated to you in ucam.org for a website. CC you, with the ucam.org allocation request. When a host named in a ucam.org alias leaves the Cambridge network its name and address will be deallocated from Cambridge's namespace. When I notice that this has happened I will usually delete the relevant alias, and free up the name in ucam.org for reallocation. If the new systems are not in the CUDN then this is fine.
Similar considerations apply for mail and most other internet services.
Delegation I will usually be willing to delegate a subdomain of ucam.org, if you can find somewhere to run the primary nameserver and someone competent to edit the zone file. For example, if you wish to run the primary nameserver in the CUDN, or do other things that the CS might object to, you should talk to the CS first. I can arrange for a secondary - contact me for details. You must allow outbound zone transfers to all comers. You must have at least three nameservers.