My personal favorites are 44.128.0.0/16, the explicitly unallocated test network for amateur packet radio to internet gateways, and 100.64.0.0/10, the address r

My personal favorites are 44.128.0.0/16, the explicitly unallocated test network for amateur packet radio to internet gateways, and 100.64.0.0/10, the address range for bidirectional carrier grade NAT.