In the NS1 platform, a linked zone refers to a "vanity domain" that forwards to another "real" (or "target") domain. For example, if your original zone is examplesite.net, you might also purchase example.site to serve the same content. In this case, all DNS records associated with examplesite.net should be available within example.site so that both zones point to the same place. Instead of creating two separate (or unlinked) zones that you will have to configure individually and update manually, you can create a linked zone (example.site) that points to the target zone (examplesite.net) which contains the records. This ensures that all changes made to the target zone are reflected automatically in the linked zone.
Navigate to DNS > Zones from the main navigation to view a list of zones associated with your account.
Click the + button to create a new zone.
Enter the Domain Name (FQDN) for the linked zone (i.e., the vanity domain).
Under Zone Settings, select Linked Zone.
Select the Target Zone from the drop-down menu.
Click Save Zone. The new zone appears in the list of zones with a label indicating to which zone it is linked.
You cannot chain-link zones. In other words, each linked zone must point to a non-linked zone.
Currently, the NS1 platform does not generate record-level query statistics for each linked zone. Instead, this information is aggregated within the record-level query statistics for the target zone.
You cannot edit zone settings or add records to a linked zone. All changes must be applied to the target zone. The only operation you can perform on a linked zone is to delete it. Deleting a linked zone does not impact the target zone.