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External references from the domain

Institutions with off-site hosts and services that require names within can apply to to set up the appropriate DNS records.

Administrative requirements

The requesting institution will provide a description of the purpose for which the name is being allocated, and must notify us of any change of purpose.

If the name is not associated with an existing management zone in the IP Register database, the institution must nominate a responsible person or persons, to act as administrative and technical contacts in case there are problems; the administrative contact must be a member of the institution requesting the external reference.

The acceptable use terms for the CUDN and JANET apply to the external resource.

If the external resource lies outside the UK or EU the institution should satisfy itself regarding the legislation in force (for example in respect of data protection, freedom of information and intellectual property rights) taking legal advice as appropriate.

Technical requirements

Where possible, we prefer external references to be CNAME records, i.e. to hostnames, though we can set up A/AAAA address records when an external hostname is not available.

IP addresses of external hosts should have a valid reverse lookup to a canonical name, which is not the name in This is because some systems use reverse DNS checks to determine if a device is on the CUDN.

Web servers on the referenced external host must serve only Cambridge-related material when identified by the name.


Last updated: 16 April 2018

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