F means filtered ?

@@@@ http://www.merit.edu/mail.archives/html/nanog/msg01537.html

Re: root servers more debug data

If someone was to attempt a denial of service attact against
F.root-servers.net I certainly hope Paul would filter the originating
network to protect nameservice for the other 99.5% of the Internet.

Christopher E. Stefan flatline@ironhorse.com
http://www.ironhorse.com/~flatline finger for PGP key
System Administrator Phone: (206) 783-6636
Ironhorse Software, Inc. FAX: (206) 783-4591