Abstract: A method and system are provided for maintaining domain name service for a domain name. The domain name is associated with current resource record data and a name server delegation. The method and system involves providing at least two name server groups, which includes an active name server group and at least one spare name server group that is available to replace the active name server group; associating the active name server group to the name server delegation; receiving name server operation data corresponding to each of the at least two name server groups; and determining an operation condition indicating degraded performance within the at least two name server groups. The operation condition is determined based on the received name server operation data.