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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Benefit from industry-leading real time blocklists. These DNSBLs easily plug into your existing email infrastructure to block spam and other email threats.
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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 Max on 28 Sep 2021
On September 14, 2021, the Wiz research team published a blog post describing OMIGOD, an easy-to-exploit security vulnerability that allows remote code execution (RCE) on virtual machines where Open Management Infrastructure (OMI) is installed. Users need to take action.
If you have never heard of OMI, you are not alone! It’s an open-source project run by Microsoft that’s not that well-known. However (worryingly in this case), it’s one of the most widespread programs installed on the Azure Cloud virtual machines.
The issue is that OMI has not been updated automatically, as one would expect, so the sysadmins responsible for these servers could unknowingly leave an outdated version of OMI exposed to the wild. As of today (September 17, 2021), Microsoft has started updating impacted Azure services. However, thousands of servers remain exposed with an easily exploited security vulnerability.
We are not certain, but our researchers see Mirai malware variants actively exploiting this vulnerability on the exposed Azure servers. Here’s a great example. This means that, like so many other things, Mirai variants are migrating to the cloud. Our eXploits Blocklist (eXBL) dataset includes Mirai sightings, so our researchers will keep you posted if the situation changes dramatically.
If you are a Microsoft Azure user – DON’T PANIC! Grab a coffee, keep reading and put a plan of action together.
All OMI versions below v1.6.8-1 are vulnerable. We urge you to check your OMI version, and if it is at risk, have your security team read and implement this documentation from Microsoft as soon as possible.
Please consider that your servers may have already been exposed to an attack! If your servers are running OMI, you should consider them insecure and take the corrective actions that your IT team suggests.
What if your servers have been compromised?
If your machines have been exploited, are part of a botnet, or are misbehaving in other ways, it may be time to consider Spamhaus’ Intelligence API (SIA). This API enables you to promptly detect if you have an issue with one (or more) of your IPs, i.e. if it’s listed on our eXploits blocklist or CSS blocklist. SIA serves up enriched data relating to IPs that our research team observes to exhibit signs of compromise or IPs emitting spam.
Remember reputation matters
The word “compromise” immediately brings to mind ransomware horror stories, given the recent proliferation of high-profile attacks that have been covered in the media. But, you must remember the importance of the reputation of your IP space.
If the IP space you use is seen to be a cesspit, be it no fault of your own, then trouble will follow, including issues with sending legitimate emails.
The data provided through SIA allows you to view both current and historical IP listings, arming you with the knowledge of how much compromise has happened across your network today and what has happened historically. This provides you with a good indicator of how good or bad your IP reputation may be.
Testing the waters
If you’d like to experiment with SIA data and how you can utilize it, you can sign-up for a free Developer License, which provides you with a limited number of queries per month at no cost.
Finished your coffee?
It’s time to start to put that plan into action. Good-luck! We hope you don’t find any signs of compromise.
This API provides access to multiple datasets containing metadata relating to compromised IP addresses. These IP addresses may be exhibiting compromised behavior, including malware, worm, and trojan infections, and SMTP-specific traffic emitting spam, or cybercriminals are using them to control infected computers – botnet command & controllers.
The breadth of data available via an easily consumable API provides security developers with scores of opportunities.
19 October 2021
Here's a story of doorbells, specific software development kits (SDKs), proxies, and miscreants using your home network to send spam.
30 June 2021
Spamhaus has released the extended CSS Blocklist (CSS) and made it available via our API service. This provides users with additional insights relating to compromised and malicious IP addresses.
23 March 2021
We're aware that it can take time to find the right use case and build the right application to meet its needs. So, we've created a license to give developers access to the data without the 30-day time limit attached to a trial. The developer license runs for six-month periods.