At ClouDNS, you are able to share specific DNS zones to other customers. This way, the ones which have access to it, will be able to edit, create and delete records in this DNS zone. It is suitable, if you would like to allow a user to manage specific DNS zones, without providing the ownership permissions.
You can share a DNS zone, by click on "Share this zone" from your Dashboard and type in the e-mail address of the account that you would like to share the zone with. Another way to do it is to click on the DNS zone that you would like to share. Then, from the DNS zone management page, click on "Zone shares" and type the e-mail address. This option is available for all types of DNS zones. There is no limit on shared DNS zones - free account can manage as many DNS zones, as shared with it.