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ISP IP Blacklist

Dear Mates

This is not a technical question but it is more like a general question in which I would really appreciate your feedback.

We are an ISP, and we provide services to many enterprises, we clients are usually finding the IP address we allocate to them in some blacklists, which sometimes prevents them from using certain services on the Internet, until the IPs are removed from the blacklist.

Taking into account that we do not have control over what our clients do to get tham blacklisted, I would like to know whether there is something we as the ISP can do in order to minimize the risk of our clients get blacklisted.

Thanks in Advance

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2 Replies
Legend Legend

The best way to as an ISP is ensure your customers do not get blacklisted is very simple: Make sure you have an easy way for Internet users to report abuse emanating from your netblocks, AND ACTUALLY BE RESPONSIVE TO COMPLAINTS.  Ensure that the abuse email addresses displayed with the WHOIS records associated with your domains & IP netblock allocations at ARIN/RIPE/APNIC/LACNIC/etc. are correct, and not filtered for anti-spam and attachments.  Nothing is more infuriating than taking the time to file an abuse report only to have it bounce back because it was classified as spam, or the abuse mailbox is full, or it doesn't exist at all.  It is also a great idea for users to be able to report abuse through a form on your main website, just make sure it is relatively easy to find.

Failing to do these things will ensure that the blacklists enforced against a single customer of yours will grow over time to include all netblocks assigned to the entire ISP, and catch your innocent customers in the collateral damage.  Getting your netblocks extricated from  dozens of Internet blacklists after the fact will be difficult if not impossible.


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Hi Tim

thanks for your reply.

This is exactly what is happening, the blacklist is now including all the netblocks assigned to the us, and hence catching innocent customer in the collateral damage.
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