By following the steps at the removals page you can request removal from the AHBL.
A user/provider can request a delisting of an open proxy/open relay host using our automated testing system. It takes between 1-5 days before a host will be tested by our automated system (it is done randomly), and provided that the host is no longer open, the listing will be removed.
If the listing is a Spam Source, Spam Support, or similar that was manually added by an AHBL administrator, the person/company/ISP that is being blocked must provide a reason for delisting via the online form from the lookup page. Most times, removals of these types requires a vote by the AHBL administration (which can take 2-7 days usually). Provided the majority of the votes are Yes for delisting, the host will be removed from the database and the ticket closed.
In the case of a Shoot On Sight listing, removals are rarely if ever accepted or considered. If a SOS removal is accepted, it must pass a vote of unamious Yes, or the host will not be removed.