Collaborative analytics for independently administered network domains

A method includes receiving a first analytics set performed on a first network security appliance operated internal to a first organization, receiving a second analytics set performed on a second network security appliance operated internal to a second organization, processing the first analytics set and the second analytics set, and responsive to the processing, disseminating to the second network security appliance information indicating that the second analytics set has also been performed on at least the first network security appliance, without revealing an identity of the first organization. In one embodiment at least part of the first analytics set or the second analytics set is hashed.