Spamhaus offers a Border Gateway Protocol feed of three of its lists, which Spamhaus refers to as the BGPf, which is comprised of the following three datasets: the Spamhaus Botnet Controller List (BCL), the DROP List, and the extended DROP List (EDROP). These lists are intended to be loaded into routers and then used to block packets originating from IPs involved in certain types of malicious activity. Following is further information about BGPf:

The Spamhaus DROP List, as well as the Spamhaus extended DROP List (EDROP) are available for free in text format. BCL is avilable for free for Small- and Home Office (SOHO) users exclusively (check out the BCL page for more information). A BGP feed of all three lists is available for a free trial. For details, please contact our Data feed providers.

Each of the three lists have their own listing policies. Those listing policies are public, and can be found here:

• Spamhaus DROP listing policy
• Spamhaus EDROP listing policy
• Spamhaus BCL listing policy

Case Studies
The Spamhaus BGPf has already proven its effectiveness on production networks. A case study about the implementation of BGPf in a production environment can be found here:

• Spamhaus BGPf Case Study at Schibsted IT (HTML version at securityZONES website)
• Spamhaus BGPf Case Study at Schibsted IT (PDF - 256KB)

In 2013, Spamhaus published a blog post about the effectiveness of BGPf. The blog post provides some insights about the data served via BGPf and can be viewed here:

• Celebrating The First Birthday Of The Spamhaus BGPf (blog post)

Available lists that are free of charge
Spamhaus DROP and EDROP are also available in plain text format and can be obtained for free here:

• The DROP List (plain text)
• The EDROP List (plain text)
• The DROPv6 List (text)
• The ASN-DROP List (text)