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In page The Spamhaus Project:

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The Spamhaus Don't Route Or Peer (DROP) List is a text file delineating CIDR blocks that have been stolen or are otherwise "totally controlled by spammers or 100% spam hosting operations".[1] As a small subset of the SBL, it does not include address ranges registered to ISPs and sublet to spammers, but only those network blocks wholly used by spammers. It is intended to be incorporated in firewalls and routing equipment to drop all network traffic to and from the listed blocks.[1] The DROP webpage FAQ[2] states the data is free for all to download and use. In 2012 Spamhaus offered a BGP feed of the same DROP data.