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 out who we work with and how you can become a Spamhaus Partner.
Discover a wide range of blog posts, case studies and reports.
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.
Help for Spamhaus Public Mirror users
Using the Project’s Public Mirrors 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 3 Jul 2018
There are several Internet Service Providers (ISPs), along with their customers, who are unwittingly missing out on the opportunity to have uninterrupted access to Spamhaus' commercial-grade IP and domain reputation data. Here's how to ensure you stay protected with our domain name server block lists (DNSBLs) and increase the value of the service you provide to your customers.
There are multiple solutions, feeds, and services in the commercial anti-spam marketplace, including blocklists. This form of email filtering is simple, exceptionally effective (99%+ catch rate), and for many small-scale users, it is free.
Malicious emails are blocked before they even reach your users’ inboxes reducing storage costs, bandwidth usage, and of course, increasing your email security.
Experienced security researchers and threat hunters update the DNSBLs 24/7. Their sole focus is to track spam and cyber-related threats, such as phishing, malware, and botnets.
Currently, three billion mailboxes (for those of you who are precise, see here for today’s exact number) use Spamhaus’ blocklists.
Good question. Keep reading.
Occasionally large-scale users like to avail themselves of Spamhaus’ free public mirrors (DNSBL servers). Spamhaus has always believed in protecting individuals, small businesses, and nonprofit organizations for free.
Over the years, a global network of over 80 servers has been built, serving billions of queries to the public at no cost, as long as the usage is within limits set out in the policy detailed below:
Suppose you are an ISP provider with one or multiple customers over-querying the public servers through your recursive server(s). In that case, there is the potential that the recursive server(s) in question will be blocked from returning queries via the public mirrors service.
This means that not only do those who are guilty of abusing the service lose out, everyone does. Moreover, you will probably be completely unaware that the service is blocked.
We understand the inconvenience and potential risks an outage of threat intelligence could mean for all concerned:
We all know you can’t keep everyone happy all of the time, but we like to try. Therefore, we offer Spamhaus’s public servers/mirrors users access to our free Data Query Service (DQS).
This service provides every user with a unique key, which identifies their individual query usage, stopping the aggregation of data usage across a single DNS resolver.
The even better news is that the DQS has multiple advantages:
All you need to do is share this message with your customers to ensure there are no potential access issues to the Spamhaus blocklists for anyone.
We suggest dropping your marketing team a note to see how they could help you communicate this information to your customers.
An alternative route and one many ISPs take to increase the value of your service offering is to provide this added layer of email protection to your customers’ mailboxes for free.
“Ouch,” we hear you say, “that’s going to be expensive.” Don’t jump too hastily to that conclusion – connect with us today to find out what the actual costs would be to your business. After all, a ransomware attack is likely to be far more costly.
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.
21 February 2021
If you are a Spamhaus Project Public Mirror user, here's the technical information on how to configure your MTA correctly to accept error codes.
11 February 2021
The Spamhaus Project are introducing error codes to indicate when no data is being returned. If you're using these blocklists ensure you check your MTA configuration.
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?