The hashing load balancer distributes the hosts in a cluster on a 64-bit ring. When no hash is produced by the hash policy for a route, the load balancer selects a random number as the hash. The 16 high bits of the random number are uniformly 0, because the generator only produces 48-bit values. Because the high 10 bits of the hash are the ones actually used, this results in exactly one host being selected.