How does the AHBL differ from other DNSBLs?

The AHBL is an aggressive multifaceted blacklist of systems, networks, and domains that are abusive or open to widespread abuse.

It is not simply a spam blacklist, or an open proxy blacklist, or an open relay blacklist. We list for a variety of technical and non-technical criteria. We differ from other blacklists primarily in our broad scope, and willingness to expand that scope where appropriate to include new categories of internet abuse.