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.
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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.
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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.
A wide range of datasets, providing multiple layers of protection. They can be plugged directly into your existing hardware, making them an affordable choice.
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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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Passive DNS and extended datasets give you additional information on internet resources. They provide deeper insights into incidents and possible 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.
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 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.
IP blocklists updated in real time to provide an effective and economic first line of defense against spam and other malicious emails.
The Spamhaus IP-based DNSBLs contain real time data on IP addresses that have been observed to be involved in sending or hosting spam, including hijacked servers and computers infected with botnets.
Our IP blocklists include the Spamhaus Blocklist (SBL), the eXploits Blocklist (XBL), the Policy Blocklist (PBL), and the Auth Blocklist (Auth BL).
These listings are compiled using a wide range of investigative techniques including machine learning, heuristics and manual investigations. They analyze 9 billion SMTP connections daily.
This form of email filtering is an effective mechanism for removing the vast majority of junk email at the gateway. Secondary filtering, using more expensive anti-spam resources, can then be used to identify unwanted emails that manage to get through this first layer of defense.
The SBL, XBL and PBL can all be queried at the same time through Spamhaus “ZEN”. ZEN combines all three blocklists to speed up query times.
All our IP blocklists are included in a single subscription.
This list contains IP addresses that are observed to be involved in sending spam, snowshoe spamming, botnet command and controllers (C&Cs), bulletproof hosting companies and hijacked IP space.
A subset of the Spamhaus Block List (SBL) is the Botnet Controller List (BCL) which is an advisory “drop all traffic” list consisting of single IPv4 addresses, used by cybercriminals to control infected computers (bots). The BCL does not contain any subnets or CIDR prefixes larger than /32.
The SBL can be used as both a sender IP blocklist and a URI blocklist, to help protect your mailstreams from spam and botnet malware.
Senders whose IP addresses have been listed in the SBL will receive a bounceback message, allowing them to check the email addresses of recipients, or correct any other sending issues.
This blocklist is included in ZEN which combines the listings contained in the SBL, XBL, and PBL. This makes it easier and faster to query, and is available via our Data Query Service (DQS). For further information on consuming our blocklists via API, please contact us.
This lists the individual IPs (/32s) that are infected with malware, worms, and Trojans; third party exploits, such as open proxies; or devices controlled by botnets. The constantly updated list is designed to protect networks from malware and spam by preventing mailservers from accepting connections from compromised computing devices.
The XBL is also available in an “enhanced” version (eXBL) which gives additional information for each individual IPs listing.
The Policy Blocklist (PBL) includes IP address ranges for end-user devices, such as home routers, smart TVs, and other Information of Things (IoT) devices, from which email should never be sent. This protects networks from the potential of being compromised by malware spread by botnet command and controller servers (C&Cs).
This list covers the majority of end user IPv4 space, in addition to some IPv6 ranges. While some individual IP addresses are included, most PBL listings are in classless inter domain routing (CIDR) format and are at least /24 in size.
By managing your own IP address range on the PBL, your organization can protect other networks from receiving spam from infected devices on your network. This helps to protect email recipients from malware, preserves the reputation of your company and avoids your domain being added to a DNSBL, which would result in your organization’s outgoing emails being blocked. To register your IP ranges, visit the Spamhaus PBL page.
This is a subset of the XBL. It lists IP addresses known to host bots using brute force or stolen SMTP-AUTH credentials to send spam, phishing and malware emails.
Botnets are often employed by cybercriminals to circumvent SMTP Auth: the security protocol that requires client machines to identify themselves to mailservers prior to being able to send or receive email.
We make the Auth Blocklist (Auth BL) available seperately, so you can use it at SMTP Auth as a score to make sure that someone isn’t trying to misuse a user’s account.
This subset is included in our IP blocklist subscription, and is available via our Data Query Service (DQS). It can also be consumed via an API. For further information, please contact us.
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