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Spamhaus Userbase
At 23 February 2024 the Spamhaus Blocklists are protecting an estimated 3,126,410,000 user mailboxes
Source: Spamhaus Datafeed service

The Spamhaus Project is an international nonprofit organization that tracks spam and related cyber threats such as phishing, malware and botnets, provides realtime actionable and highly accurate threat intelligence to the Internet's major networks, corporations and security vendors, and works with law enforcement agencies to identify and pursue spam and malware sources worldwide.

Originally founded in London 1998, Spamhaus is currently based in Andorra la Vella, Andorra, and is run by a dedicated staff of 38 investigators, forensics specialists and network engineers located in 10 nations.

Spamhaus realtime threat and reputation blocklists currently protect over 3 Billion user mailboxes* and are responsible for blocking the vast majority of spam and malware sent out on the Internet. Spamhaus data is today used by the majority of the Internet's ISPs, email service providers, corporations, universities, governments and military networks.

* Actual live number of mailboxes protected is published under 'Spamhaus Userbase' on the left of this page.
As well as DNS-based Blocklists (DNSBLs) Spamhaus produces special data for use with Internet firewall and routing equipment, such as the Spamhaus DROP lists, Botnet C&C data, and the Spamhaus Response Policy Zone (RPZ) data for DNS resolvers which prevents millions of Internet users from clicking on malicious links in phishing and malware emails.

To meet public demand for its DNSBLs, Spamhaus has built one of the largest DNS infrastructures in the world. The Spamhaus network of over 80 public DNSBL servers spread across 18 countries serves many billions of DNSBL queries to the public every day, free of charge.

Spamhaus CEO Steve Linford
Spamhaus CEO Steve Linford speaking at the European Parliament

The Spamhaus team works closely with Law Enforcement Cyber Crimes teams, assisting investigations into spam senders, phishing, botnets and malware operations, and compiling profiles, backgrounds and evidence on spam gangs and spam operations.

Spamhaus's main LEA working partners are:

National Cyber-Forensics
and Training Alliance

Federal Bureau of Investigation
Spamhaus is a member of the main Law Enforcement task force dealing with international cybercrime issues, and a member of the main Internet Industry work groups set up to deal with abuse issues. These include:

London Action Plan (LAP)

Messaging Anti-Abuse Working Group

Awards presented to Spamhaus include:

Cyber Crime Fighter Award
presented to Spamhaus by the Federal Bureau of Investigation's National Cyber-Forensics and Training Alliance (NCFTA).

Internet Hero Award
presented to Spamhaus by the Internet Service Providers Association (ISPA) (2003)

Greatest Contribution to anti-spam in the last 10 years
presented to Spamhaus by Virus Bulletin Magazine.

The Spamhaus Project SLU; Corporate Headquarters:
Av Princep Benlloch 26-30, Andorra la Vella, AD500, Andorra.

Spamhaus and the Spamhaus Logo are ® Registered Trademarks.
A not-for-profit company limited by guarantee.
Registered in Andorra la Vella, Principality of Andorra.
Company registration number 18159. Tax ID 713266-A.
© 1998-2024 The Spamhaus Project SLU. All rights reserved.
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