Missing registrations (when is a bogon not a bogon)

[Sean Donelan <sean () donelan com>]

Based on the e-mail I got, I think several people missed Hank Nussbacher
and Barry Greene's presentation at the last NANOG.

http://www.nanog.org/mtg-0302/ppt/hank.pdf

In the presentation they list several ASN and Network blocks in use, but
not registered in any database.

The US Department of Defense (AS 568) wins the prize for the most
unregistered network blocks being announced.  But they weren't alone.

If you are going to start blackholing unregistered network blocks, I
suggest checking if the current user has nuclear weapons.  But once again,
which ISP's aren't filtering?