Delegation of an existing service.gov.uk subdomain

This runbook covers the process for delegation of an existing service.gov.uk subdomain. These domains are typically managed by CDDO so the request must be submitted to them for the delegation.

Pre-requisites

• Request meets rules around delegation
• Domain is not managed via the BT DNS - If that is the case see runbook for delegation of gov.uk subdomains.
• New hosting provider has replicated existing DNS configuration.

Submit delegation request to CDDO

1. E-mail request for delegation to GDS domains team at govuk-enquiries@digital.cabinet-office.gov.uk. Include new NS record details.

2. GDS will confirm when subdomain is delegated.

3. Confirm to the Requester that the subdomain has been delegated.

After delegation has fully propogated (depending on length of existing NS Record TTL) there may be the need to remove the existing hostedzone from DNS and delete the old Hostedzone.

This page was last reviewed on 13 May 2025. It needs to be reviewed again on 13 August 2025 by the page owner #operations-engineering-alerts .