1. Click on the Zones folder of the group containing the zone you wish to undelete.
  2. Click 'View Zone Log' near the top of the page.
  3. Find the zone you deleted and click 'undelete'. (Or click on the zone to view it first, then click 'Undelete'.)
  4. Click the 'Save' button.
Note: you can't undelete a zone if a zone with the same name exists.