The registration of an individual for a service while providing protection against unintentional duplication of registration for the same organization. Upon receiving a request to register for a service from an individual over a network, it is automatically estimated as to whether the individual requesting registration belongs to the same organization as a prior registrant for the service. If so, the service notifies the individual requesting registration that they might belong to the same organization as a prior registrant. In one embodiment, it is then left to the individual as to whether they want to continue registering for the service.