No preliminary check of the nameserver will be performed by Registry Services. The Zonemaster tool is used by Registry Services to check all the DNS changes in the .se and .nu zone once a day. If any error is noticed during this check, for example an incorrect delegation or re-delegation, the sponsoring client (the registrar), will receive an email about this. (It is possible to opt-out on these mails.) This means that the first check of a newly registered domain takes place on average 12 hours after it has been delegated.