Have you been blocked?
All blocklists are researched and managed by The Spamhaus Project.
Simply click on the link below, which will take you to the Project’s IP and Domain Reputation Checker. From here you will be able to enter your IP or Domain and begin your request for removal.
Please note that the Project’s IP and Domain Reputation Checker is the only place where removals are handled.
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From processing issues, to email-borne threats our blocklists easily integrate with your current email set-up to improve anti-spam & anti-virus email filtering.
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Block the worst of the worst at your network edge, taking advantage of your existing BGP-capable routers. Configuration only takes minutes.
Data Query Service (DQS)
Benefit from industry-leading real time blocklists. These DNSBLs easily plug into your existing email infrastructure to block spam and other email threats.
A powerful research tool to investigate relationships between internet infrastructures. Quickly pivot to new areas of concern to rapidly investigate potential threats.
Immediately block connections to dangerous sites, including phishing and malware dropper websites. A ‘set and forget’ solution.
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Threat intelligence data in API format to enable users to easily integrate metadata relating to threats with their own applications, programs, and products.
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Domain (DBL), Zero Reputation (ZRD) and Hash blocklists (HBL) enable you to block content in emails, filtering out a higher rate of email-borne threats.
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A wide range of feeds to apply to your DNS recursive server. Choose the right level of protection for your organization.
Spam (SBL), Policy (PBL), Exploits (XBL) and Auth (AuthBL) blocklists allow you to filter email from IPs associated with spam, botnets, and other threats.
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The Blocklist Tester
A tool to help you check if your servers are correctly configured to use Spamhaus DNSBLs.
The Reputation Portal
A tool for ASN owners to get visibility of their IPs’ reputation and proactively manage listings.
Help for the Project's legacy DNSBLs users
Using the Project’s legacy blocklists and suddenly experiencing email issues? This page may be able to help.
In depth information about the technical details and implementation of our products.
Posted by Riccardo Alfieri on 29 Sep 2020
Spamhaus produces many different DNSBLs (blocklists), from ones focused on domains to IPs and also hashes. Each of our datasets can be applied to different parts of an email. The question is which ones to apply where?
Anyone who has attempted to bake a cake will tell you that you can’t “wing-it.” Ingredients need to be carefully measured and mixed in a specific order. Otherwise, you’ll have a sub-optimal outcome, or in my case, something that resembles a brick!
The same is true for the order in which you use our blocklists; apply the wrong blocklist to the wrong part of the email filtering process, and you’ll have a sub-optimal filtering outcome. On the flip side, combine the right blocklists at the right stage of the filtering process, and you will maximize your catch rates, increasing network, and end-user protection.
We are assuming that your knowledge of email source code is sound; however, if you need a refresher course, look at this post, which takes an in-depth look at the code.
In the meantime, the table below details different email elements. Each element is associated with the relevant blocklist to use with it. In addition to this, we highlight which SMTP phase this is associated with.
By using Spamhaus blocklists at the right point in the email filtering process, you can block a huge percentage of unwanted emails at the SMTP handshake, and then weed out additional email threats throughout the content filtering process. This technique has been proven to save companies not only money on infrastructure costs and expensive email filtering solutions, but also man-power costs…and let’s not forget the ultimate aim – keeping their users and networks safe.
Spamhaus’ Data Query Service (DQS) is an affordable and effective solution to protect your email infrastructure and users.
Using your existing email protection solution, you will be able to block spam and other related threats including malware, ransomware, and phishing emails.
The service has never failed and utilizes the longest established DNSBLs in the industry.
2 November 2022
As of Wednesday, November 9th, the CSS dataset will start to grow. We anticipate the addition of 1.5 million listings over the next 4-6 months; that's approximately a 100% increase! Find out why and the impact to you in this blog.
6 October 2020
Data Query Service enables email provider, Universo Online (UOL) to protect millions of users from spam and other malicious email threats while freeing-up 20% of the team's time resources.
18 May 2020
It's a well-known fact that filtering emails using IP blocklists (DNSBLs) blocks the vast majority of malicious emails. It's effective and economical, using minimal computational power. So why should you also use domain and hash blocklists for filtering?