Follow the instructions below to delete a DNS zone via the NS1 portal. Alternatively, you can do this via API.
Navigate to DNS > Zones to view a list of zones associated with your account.
Click the name of the zone you want to delete to drill into zone details, and then click the Zone Settings tab.
Scroll to the bottom of the page and click Delete zone in the bottom right corner.
This action cannot be undone. If you proceed, you must update the zone's TLD delegations from NS1 to your new provider. NS1 has controls in place to prevent lame delegation hijacking, but you should update TLD delegations to point to your new provider as soon as possible.
Review the warning message and click Yes to proceed to delete the zone.
Execute the command below to remove a zone from the NS1 platform.
curl -X DELETE -H "X-NSONE-Key: $NSONE_API_KEY" https://api.nsone.net/v1/zones/<zone>