This guide applies when your domain is managed through 123 Reg. 123 Reg's current guidance requires the domain to be unlocked before its nameservers are changed, so check the account status first.
Before you start
Have the exact nameserver details supplied by Toolbelt Websites ready. Changing nameservers changes which provider controls the domain's DNS zone, so do not make this change unless Toolbelt Websites has asked you to.
If you want a plain-English explanation first, read what nameservers are.
Change the nameservers in 123 Reg
- Sign in to the 123 Reg Control Panel ↗.
- From My Products, scroll to Domains and select Manage for the domain you want to change.
- On the Domain Portfolio page, select DNS, then Nameservers.
- Select Change Nameservers.
- Choose I'll use my own nameservers.
- Enter the nameserver details supplied to you by Toolbelt Websites.
- Check the values carefully and select Save.
Important: nameservers can affect business email
Moving nameservers can move control of the complete DNS zone. If MX or other email-related records are not present at the new DNS provider, email can be affected.
Read will changing my website affect my email? before proceeding if your business uses addresses on the same domain.
Do not reset or replace unrelated DNS records. Enter only the nameserver values Toolbelt Websites has supplied and ask support if the options on screen do not match this guide.
What happens afterwards?
123 Reg currently advises allowing 24–48 hours for nameserver changes to become active. That is a provider expectation rather than a guarantee that every network will refresh at the same moment.
See what DNS propagation means and how long DNS changes can take.
Official 123 Reg resource
123 Reg also publishes current instructions for this area of its control panel. If the interface has changed since this Toolbelt Websites guide was updated, use the provider's own documentation as the authoritative interface reference.
Last updated: 8 September 2026