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 Blocklist Removal Center. From here you will be able to enter your IP or Domain and begin your request for removal.
Please note that the Project’s Blocklist Removal Center 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.
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 blocklists updated in real-time. 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.
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.
In depth information about the technical details and implementation of our products.
Posted by Milly Fawcett on 13 Aug 2018
Passive DNS has been an industry standard tool for more than a decade, but given the conversations we are having with various customers, IT teams & security teams, it’s apparent that there is some uncertainty as to what Passive DNS is, and also how it can help businesses protect both their networks and brand.
Until the introduction of Passive DNS there was no way to retrieve the content of any DNS zone owned by other people as system administrators were not keen to share them. Also, once a change was made to a DNS record the previous details were gone forever as the new version immediately propagated across the internet…. Not very helpful if you need to research all the domain names a suspect IP address has resolved to historically, and vice versa.
When a client queries a local DNS resolver and the answer is not included in the server’s cache, then the DNS resolver will query an external root server, followed by the top-level domain (TLD) server and the authoritative name server itself to get access to the requested information (see diagram ).
With special probes activated on the DNS resolver, it is possible to record the packets containing the answers to the client, along with the time & date stamp of when the query was made.
Passive DNS does not store which client (or person) made a query, just the fact that at some point in time, a domain has been associated with a specific DNS record . This ensures that privacy is maintained throughout the system.
Passive DNS data from Spamhaus is collected across the internet globally, from trusted third parties including hosting companies, enterprises, business & ISPs.
With the constant increase in the number of TLDs, there are currently more than 1,000, there is a huge amount of data to record. Spamhaus’ Passive DNS cluster handles more than 200 million DNS records per hour and stores hundreds of billions of record per month, allowing you to search this vast database easily.
Passive DNS data provides a wealth of information for IT security teams, research teams and brand protection specialists. Research analysts gain insight as to how a particular domain name changes over time and how it is related to other domains and/or IP addresses. This data enables you to build a picture of potential threats across global networks that simply cannot be identified from monitoring your own network.
Brand protection specialists can identify spoofed domains/websites, noting when they have been active and how they are associated with other domains.
Discover the value this tool can bring to multiple roles:
Passive DNS is an extremely clever and simple to use tool that’s a great addition to your security arsenal.
Sign up for a FREE Passive DNS account here.
Our Passive DNS allows you to quickly and easily navigate through billions of DNS records to shine a spotlight on potentially malicious internet resources associated with your network or domain.
27 May 2019
This is a simple to use, effective and fast investigation tool. With all the expected features of Passive DNS, and some unique features including ‘Fuzzy’ search to make investigating easier. Want to find out more?…
12 February 2019
The team at Spamhaus Malware Labs detected and blocked a record number of botnet command & control (C&C). Over 10,000 in fact. Here's what was driving the increase.
17 September 2018
Spamhaus launches its Passive DNS tool at GovWare 2018 in Singapore.