IP and Domain Reputation Website

Spamhaus

Spamhaus is an internet reputation website and research project known for DNS blocklists, IP and domain reputation data, malware and botnet intelligence, and tools that help email and network operators reduce abuse.

Official site

spamhaus.org is the main public website for The Spamhaus Project.

Core use

Email administrators and security teams use Spamhaus data to check IPs, domains, and related indicators for reputation and abuse signals.

Known datasets

Spamhaus publishes blocklists and reputation datasets covering spam sources, domains, exploits, policy ranges, botnet controllers, and do-not-route networks.

Spamhaus publishes IP and domain reputation intelligence used for email filtering, network protection, and abuse investigations.View logo asset on Spamhaus

Who is Spamhaus?

Spamhaus official site presents Spamhaus as an authority on IP and domain reputation. The project researches spam, phishing, malware, botnets, abusive infrastructure, and other forms of internet abuse, then turns that intelligence into datasets, reports, lookup tools, and guidance for operators.

Blocklists and reputation data

Spamhaus is best known for DNS blocklists used in email filtering and network protection. Its public blocklist pages describe datasets such as SBL, XBL, PBL, DBL, CSS, ZEN, BCL, and DROP. Each list has a different job, from identifying spam sources and exploit activity to flagging domains or networks that should not normally send mail.

How email filtering uses it

A mail server can query Spamhaus data during an SMTP transaction. If an IP address, domain, or other email-related artifact appears on a relevant list, the administrator can reject the message, tag it for extra filtering, or combine the result with other anti-abuse checks. The decision still belongs to the receiving organization.

Research and community input

Spamhaus combines its own research with signals from the broader internet community. Its pages describe threat hunters, researchers, analysts, spam traps, open-source intelligence, and submissions from people who report suspicious IPs, domains, URLs, or raw message sources. That mix helps connect individual abuse reports to larger patterns.

Lookup tools and portals

The website links to tools such as a blocklist tester, reputation checker, ISP portal, CERT portal, and threat-intelligence community submission portal. These tools support different audiences: a sender trying to understand a listing, a network operator cleaning up abuse, or a researcher sharing new indicators.

Who uses Spamhaus

Spamhaus is used by email administrators, internet service providers, hosting providers, CERT teams, threat-intelligence analysts, domain and network operators, security vendors, and organizations that need reputation context for abuse handling. Individual senders may also use the site to diagnose why mail delivery is failing.

Limits and careful use

A reputation listing is a strong operational signal, but it is not a full incident report. Shared hosting, compromised machines, forwarded mail, dynamic address space, stale records, and policy decisions can all affect interpretation. Operators should read the relevant list documentation, confirm ownership, and fix root causes rather than treating a listing as a mystery punishment.

Why it matters

Email and DNS abuse scale quickly because attackers can rotate infrastructure, automate registrations, and exploit poorly managed networks. Spamhaus matters because it gives defenders shared reputation signals and practical tools for slowing spam, phishing, malware delivery, botnet control, and other abuse that depends on internet identifiers.

WHOIS domain data

Data pulled: May 23, 2026View current WHOIS record

Domain: spamhaus.org
IP address: 3.126.246.180
Registrar: Nom-iq Ltd. dba COM LAUDE
WHOIS server: whois.comlaude.com
Referral URL: https://comlaude.com/whois
Created: October 1, 1999
Updated: December 24, 2025
Expires: October 1, 2026
Nameservers: hideyoshi.spamhaus.org (162.159.24.35); musashi.spamhaus.org (162.159.25.27); hideyoshi.spamhaus.com (162.159.24.35); hideyoshi.spamhaus.net (162.159.24.35); musashi.spamhaus.com (162.159.25.27); musashi.spamhaus.net (162.159.25.27)
Domain status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited; serverDeleteProhibited https://icann.org/epp#serverDeleteProhibited; clientTransferProhibited https://icann.org/epp#clientTransferProhibited; serverTransferProhibited https://icann.org/epp#serverTransferProhibited; clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited; serverUpdateProhibited https://icann.org/epp#serverUpdateProhibited
Registrant contact: Domain Admin, Spamhaus IP Holdings SLU, Andorra, AD
Contact privacy: Admin and technical contact fields are redacted for privacy.

Key concepts

DNSBLa DNS-based blocklist that mail systems can query during filtering.
IP reputationcontext about whether an address or range is associated with abuse, policy risk, or normal behavior.
Domain reputationsignals about whether a domain is connected to spam, phishing, malware, or other abusive activity.

Spamhaus datasets

SBL, XBL, PBL, DBL, CSS, and ZEN focus on different email and abuse-filtering scenarios.
BCL and DROP support network-protection and botnet-related workflows.
Commercial and free data access options are described through Spamhaus and Spamhaus Technology pages.

Common misconceptions

Spamhaus does not send or block mail directly; receiving systems decide how to use the data.
A listing can point to a compromised system, poor policy, or shared infrastructure, not only intentional abuse.
Removing a listing usually requires fixing the underlying cause, not just requesting removal.

Open questions

Which Spamhaus list produced the result, and what does that list specifically mean?
Is the affected IP or domain directly controlled by the organization, a provider, or a compromised third party?
Has the root cause been corrected before requesting delisting or changing mail-routing behavior?