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.
IT and security teams consistently face multiple business challenges. Discover how our solutions can help overcome some of those issues.
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.
Employ our threat intelligence to increase visibility across security events, reveal potential weaknesses in your network, and threats to your brand.
Stay on top of the latest threats and proactively combat botnet infections, and other forms of abuse, with our solutions.
From clicking on phishing emails to visiting malware dropper sites, our threat intelligence provides automatic protection for your users.
Data for Integration
Enhance your service and create competitive advantage by integrating Spamhaus’ world-class IP and domain reputation data.
Our products provide additional layers of security for networks and email. They also present security teams with additional insight into malicious behavior.
Border Gateway Protocol (BGP)
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.
Spamhaus Intelligence API
Threat intelligence data in API format to enable users to easily integrate metadata relating to threats with their own applications, programs, and products.
A wide range of datasets, providing multiple layers of protection. They can be plugged directly into your existing hardware, making them an affordable choice.
Border Gateway Protocol (BGP) Feeds
Do Not Route Or Peer (DROP) and Botnet Controller List (BCL) datafeeds can peer with your existing BGP-capable router.
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.
Data for Investigation
Passive DNS and extended datasets give you additional information on internet resources. They provide deeper insights into incidents and possible threats.
DNS Firewall Threat Feeds
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.
Find out more about us.
Learn more about Spamhaus; who we are, and what we do.
Find a parter
Discover our partners and how they can support you.
Become a partner
Learn about the benefits of being a Spamhaus partner and how to get started.
Discover a wide range of blog posts, case studies and reports.
Spamhaus’ insight into malware, botnet C&Cs, and the domain reputation landscape.
Commonly asked questions about Spamhaus products and processes.
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 Sarah Miller on 28 Sep 2021
You've signed up for the Spamhaus Data Query Service (DQS), made a coffee, tinkered under the hood of your email server, made some changes to your configuration, and "tada" our DNSBLs should be protecting your emails. BUT...what if there was a small error in that config? That's not a problem; there's now a tool to test if your email servers have the correct configuration to use the Spamhaus blocklists.
Many moons ago, in 1999, Russ Nelson designed a tool to test DNS-based spam blocks on www.crynwr.com. This tool worked for IP-based blocklists at the SMTP level, with users interacting through email or telnet. However, the Crynwr tester was retired in 2019.
The Spamhaus Blocklist Tester (BLT) builds on Russ Nelson’s concept, but it also tests domain and hash blocklists alongside message content in addition to IP blocklists. This is all done via a simple-to-use website interface.
The BLT attempts to deliver emails to your server by connecting from internet resources listed in our blocklists, e.g., IP addresses. The anticipated outcome is that your email server should reject all these emails – well, there are some exceptions to that rule, but we’ll come to that later.
You can perform two types of tests either individually or together, although we recommend running the SMTP test initially:
After undertaking a test, which you can run for either the Data Query Service or the Public Mirrors, a full report is displayed, showing the result of every test email sent:
Where there are issues and emails have been delivered that shouldn’t have been, you can click through to get a full report of the SMTP exchange to assist with troubleshooting:
We’ve tried to make this tool simple to use while providing as much information as possible to help you resolve any issues you might be experiencing with your set up.
We hope you find this tool helpful.
As always, we’d love to hear your feedback on it via the contact form in the Blocklist Tester.
To ensure our DNSBLs protect your email stream, a simple tool is available called the Blocklist Tester. It’s quick and easy to use; once you have verified an email address associated with your email server, test emails are sent. These emails contain resources listed on our blocklists and should be rejected.
Once the test is complete, a full detailed report is available, and the SMTP exchange of each email sent is available to help you understand where any problems may lie in your configuration.
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.
17 November 2021
Users of the Spamhaus Domain Blocklist will soon have the added accuracy of hostnames being used for the abused-legit section. Get further information and also find out how you can get your hands on the beta version.
29 October 2021
In celebration of the first-ever networked email being sent 50 years ago today (!), one Spamhaus Project researcher recounts when they blocked the whole of Italy from sending email, and nobody wanted to do anything to fix it!
29 January 2021
There are various comments bandied about with some regularity relating to Domain Name System Blocklists (DNSBLs). So, we thought it was about time to provide some truths when it comes to blocklists and dispel these myths.