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by dredmorbius 2550 days ago
CIDR blocks are your friend, at the firewall.
1 comments
jakeogh 2549 days ago
Know of a lib to manage them?
link
dredmorbius 2547 days ago
Not offhand. The Routeviews project is a useful way to turn them up, though.

http://www.routeviews.org/routeviews/

Particularly reverse DNS queries.

link