Wasted space

While importing netblock data I discovered what must be common knowledge for most. A large portion of allocated space is not being announced. Equally exciting was the discovery that a large portion of space is maintainer-free, thus making it essentially impossible to have an exact accounting of who has what. IMO this seems much like those people who hoard domain names, except worse because ipv4 space is finite. Seems like we ought to drop these pointless allocations and make the owners justify space they use in the future. Networks using such space for internal use can use NAT if they ever decide to connect the The Internet. Austin