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The Spamhaus Don't Route Or Peer List
DROP (Don't Route Or Peer) is an advisory "drop all traffic" list, consisting of stolen 'zombie' netblocks and netblocks controlled entirely by professional spammers. DROP is a tiny sub-set of the SBL designed for use by firewalls and routing equipment.
DROP is currently available as a simple text list, but will also be available shortly as BGP with routes of listed IPs announced via an AS# allowing networks to then null those routes as being IPs that they do not wish to route traffic for.
The DROP list will NEVER include any IP space "owned" by any legitimate network and reassigned - even if reassigned to the "spammers from hell". It will ONLY include IP space totally controlled by spammers or 100% spam hosting operations. These are "direct allocations" from ARIN, RIPE, APNIC, LACNIC, and others to known spammers, and the troubling run of "hijacked zombie" IP blocks that have been snatched away from their original owners (which in most cases are long dead corporations) and are now controlled by spammers or netblock thieves who resell the space to spammers.
When implemented at a network or ISP's 'core routers', DROP will protect all the network's users from spamming, scanning, harvesting and dDoS attacks originating on rogue netblocks.
Spamhaus strongly encourages the use of DROP by tier-1s and backbones. See the DROP FAQ for information on use and implementation.
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