Set up a web address for your site

User level: Site Owner; Site Administrator


The page outlines the different web address options available on Oxford Mosaic, explains the technical details behind these and outlines the rules relating to each option.

Domain registration and hosting is separate to web-hosting and is largely managed independently of the Mosaic platform. So in these cases, acquiring and using a custom domain for your site is a 5-step process.

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When a new website is created on the Oxford Mosaic platform it is provisioned with a platform address of:


where <prefix> has the value that was supplied on the Site Request form.

This address is suitable to be used as a public web address for your site. (Using ‘www.’ as the first part of an address is an optional convention, which is often not used nowadays.) Using the <prefix> domain means the site is automatically covered by the Mosaic Platform's SSL Security Certificate which supports HTTPS by default. In this case, there is no need to register another address and you are good-to-go in putting your site live whenever you are ready to do so.

However, in some cases it is desirable to have a web address that is more tailored, e.g.

  • To associate a site as a part of an existing Oxford University domain, i.e. <prefix>.<existingdomain>
  • To create a new Oxford University domain, i.e. www.<newdomain>
  • Or, if the site is for a multi-institution project or partnership, to use an external domain outside *, e.g. www.<newdomain>

Domain registration and hosting is separate to web-hosting and is largely managed independently of the Mosaic platform. So in these cases, acquiring and using a custom domain for your site is a 5-step process:

  1. Ensure that the address you wish to use complies with University Policy and local web governance arrangements
  2. Request addition of the new domain to the Mosaic platform's SSL Security Certificate
  3. Request registration of the new domain or transfer in an existing domain
  4. Configure the custom domain to point to the Mosaic platform server
  5. Add the domain to your Mosaic site

Approval: Please note that new domain names must be approved by the appropriate Head of Department or Head of House. Some requests may have to be referred to other bodies within the University, for example to Legal Services – see

Steps 1 and 3 apply to all websites published on University web systems or within its domain space. Adding the domain name to your Oxford Mosaic site (step 4) can be done at any time but will only take effect once step 3 is in place. Step 2 should be done in good time to ensure that security alerts do not appear in browsers once the new domain points to your Mosaic site.

Alternatively, if you are replacing a website that already has its own domain name, this address can be added to the platform security certificate and switched to point to your Mosaic website when you are ready to go-live.

University policy on domain names is set out at, with guidance given at New domain names must be approved by the appropriate Head of Department or Head of House.

All Oxford Mosaic websites are hosted on the Acquia Cloud in a server farm within the EU. It is University Policy that all * domains which point to external hosts must by registered and configured centrally by the registration team within IT Services. Even if you intend to use an external domain name with your site - which is supported - it must be registered and hosted by the University’s domain registrar, in order that the domain name can be added to the Mosaic Platform's SSL Security Certificate. If your domain name has already been registered outside the University, it will need to be transferred-in.

Governance for the creation and maintenance of websites is devolved to local units around the University – see the information on how to Request a new website. You should consult your local web manager about any local policies that may apply to the creation and use of domain names.

It is often simpler and quicker to use a web address that creates a new part to an existing domain, i.e. using the <prefix>.<existingdomain> form of URL. In this case you need to consult the owner of the existing domain to request registration of the new address using the prefix. This approach may be well-suited to research groups within a department or sub-department who may associate their project with their department’s domain.

If your site is for a Student Club or Society, a convention has been established for domain names. These sites will be given domain names of the form <prefix> Registration of new domains for Student Clubs and Societies is not available.

Oxford Mosaic now supports HTTPS-only. This implements emerging best practice standards for website security on the Mosaic platform.

As a consequence, when any custom domain is added to a Mosaic website, it must also be added to the platform’s SSL Security Certificate. If this is not done, when viewed using the custom domain, the website will display security alerts in web browsers.

The Mosaic platform SSL Certificate is now updated on a monthly basis. If you plan to add a new custom domain to a Mosaic site – whether as part of a site’s go-live or at any other time - you need to inform the Mosaic service team ( in good time.

Requests received by the first day of the month will be added to the certificate by the first day of the following month, e.g.:

Tell us by ... Will be added to the SSL Certificate by ... This is the deadline for domains going live in
1 February 2018 1 March 2018 March
1 March 2018 1 April 2018 April
1 April 2018 1 May 2018 May
etc ...    

If you want to add your custom domain to the SSL Certificate but you are not sure whether you will be ready to use the domain by the following certificate update period, let us know anyway. We can add it to the certificate in advance, and it won’t take effect until the domain is pointed to your site. Requests to add a domain to the certificate must be received no later than when the domain has been approved by the University Domain Registrar.

Please note: In order to be added to the SSL Security Certificate, the domain MUST be registered by the University Domain Registrar.

To register a new domain or transfer-in an existing externally registered domain, contact A table of charges applying is available. Ensure that your request has been appropriately approved before making the request and explain that the site you will use the domain on will be a Mosaic website.

If you are transferring-in a domain name from an external registrar, you should supply details of that registrar so that the Domains team can organise the transfer. 

To register a new part to an existing domain, contact the local web manager of the existing domain in the first instance. Management of unit sub-domains is often devolved to local IT managers who will be able to deal with your request, liaising with the central Domains team as needed on your behalf.

Please note, six-part web addresses, such as www.<prefix>.<domain>, are not supported by the Oxford domain name system.

To comply with University policy, this has to be done centrally by the IT Services Networks team. Requests to point a domain to Mosaic should be sent to Requests should be sent only after you have been given approval for the domain you wish to use to be registered: you must include evidence of such approval in your request in order for it to be actioned.

The Networks team require requests to be made in the following specific form: 

"Could you add the following ASIS record via the DNS interface ASIS '<your>.<address> IN CNAME'"

Replace <your>.<address> with whatever you have registered for your domain, e.g. or If you are using an external URL, give that: e.g.

Once this configuration is done, hits on your domain name will be routed to the Mosaic platform. You should therefore only request this when you are ready to go live with your site – you should allow time to complete the related go-live steps and ensure that the update of the platform's SSL Certificate has been completed. DNS updates are made on the hour: with notice, you can ask the Networks team to queue this work for a specific hour, or they will action it as soon after receiving the request as possible. Updates are sometimes actioned the next day.

The final step needed to use a custom domain with your site, is to add it to your site in Mosaic. This tells Mosaic which site to resolve requests to once they arrive at the platform. This can be done at any time in relation to steps 1 and 3, but once they are completed, until this step is done, any user requesting your domain in their browser will see a Mosaic holding page. 

This needs to be done by a Site Owner or Site Administrator in the Site Settings > Domains tab:


The tab displays the current primary domain of the site: until your custom domain is added this will be the Platform address.

Once you add a custom domain to use on your site, you need to set your preferred domain as the Primary domain – this will be the one used in links back to the site, e.g. in the Search results list. Normally, you will want your custom domain to be the Primary domain. 

  •  Add the domain name into the Domain Name box in the form of Do not include http:// or a trailing slash 
  •  Check the box against the 'Is primary domain?' option 
  •  Save the settings 

After you hit Save Settings, it will take around 10-20 seconds for the page to respond whilst the domain is entered onto the platform and associated to your site. Once this is finished the domain setup is complete and your site will be serving publicly to your web users from the custom domain. 


If you need assistance with requesting and co-ordinating the steps necessary to setup and add a custom domain for use with your Mosaic site, you may request help by selecting the ‘Request a custom domain’ button in the Site Settings > Domains tab of your site.

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