Quick answer
Changing nameservers for a domain at 123 Reg moves DNS authority for the domain. Prepare the complete destination zone before changing the registrar delegation.
Applies to
For the owner or an authorized editor of the website/account named in this article. Confirm the installed product version and permissions. Interactive Online hosting access does not automatically grant an application administrator login.
Steps
- Confirm that 123 Reg is still the current registrar/account provider. Preserve all existing website, mail and verification records, and review DNSSEC/DS requirements with the provider.
- Prepare the replacement zone at the intended DNS service. In the current registrar's domain-management controls, select the exact domain and its nameserver/delegation settings, then enter only the complete nameserver hostnames supplied for that service.
- Review the saved delegation and authoritative answers, then test the website and two-way email. Keep the old service available until the replacement is verified.
Check the result
Verify the delegation, returned DNS records, HTTPS and mail separately. Cache expiry depends on actual TTLs and provider processing; an old fixed 24-hour estimate is not a guarantee.
Troubleshooting and support
If the old 123 Reg menu is absent, use the current provider guidance. Do not replace MX/TXT records or change hosting merely to update nameservers.
Contact support from the owning account with the domain, product/version, exact error, time/time zone and redacted evidence. Exclude credentials, session URLs, payment details and private customer records. Confirm any separate application-support scope.
Related help
- Change nameservers without losing email and verification records
- Identify your domain registrar, DNS provider, and website host
- Plan DNS TTL changes before a website cutover
Official references
Written guidance reviewed November 1, 2026. The preserved historical tutorial has not been recertified for current software.
