Suped

Log inGet started

Blocklist checker

Instantly check your domain or IP against hundreds of email blocklists and blacklists, including all major DNSBL, RBL, and RHSBL lists.
Blocklist checker
Check your domain or IP against 144 blocklists.
www.spamhaus.org logoSpamhaus0spam.org logo0Spam
Blocklist icon
Abusix
Blocklist icon
Barracuda Networkswww.spamcop.net logoCisco
Blocklist icon
Mailspikewww.nosolicitado.org logoNoSolicitado
Blocklist icon
SURBL
Blocklist icon
UCEPROTECTuribl.com logoURIBL
Blocklist icon
8086 Consultancyabuse.ro logoabuse.rowiki.alphanet.ch logoALPHANETanonmails.de logoAnonmailsascams.com logoAscamswww.blockedservers.com logoBLOCKEDSERVERS
Blocklist icon
Brukalai.ltdnsbl.calivent.com.pe logoCalivent Networks
Blocklist icon
dan.me.uk
Blocklist icon
DrMx
Blocklist icon
DroneBLrbl.efnetrbl.org logoEFnet
Blocklist icon
Fabel
Blocklist icon
GBUdb
Blocklist icon
ImproWare
Blocklist icon
JIPPG Technologies
Blocklist icon
Junk Email Filterwww.justspam.org logoJustSpamwww.kempt.net logoKempt.net
Blocklist icon
Mail Babywww.nordspam.com logoNordSpam
Blocklist icon
nsZones
Blocklist icon
Polspam
Blocklist icon
RedHawkrv-soft.info logoRV-SOFT Technology
Blocklist icon
Schultewww.scientificspam.net logoScientific Spam
Blocklist icon
Spam Eating Monkeypsbl.org logoSpamikazewww.spamrats.com logoSpamRATSspfbl.net logoSPFBLsuomispam.net logoSuomispamwww.usenix.org.uk logoSystem 5 Hosting
Blocklist icon
Taughannock Networkswww.team-cymru.com logoTeam Cymru
Blocklist icon
Tornevall Networkssenderscore.org logoValiditywww.blocklist.de logowww.blocklist.de Fail2Ban-Reporting Servicezapbl.net logoZapBL2stepback.dk logo2stepback.dkfaynticrbl.org logoFayntic Servicesorbz.gst-group.co.uk logoORB UKdnsbl.technoirc.org logotechnoirc.orgwww.techtheft.info logoTechTheftwww.spamhaus.org logoSpamhaus0spam.org logo0Spam
Blocklist icon
Abusix
Blocklist icon
Barracuda Networkswww.spamcop.net logoCisco
Blocklist icon
Mailspikewww.nosolicitado.org logoNoSolicitado
Blocklist icon
SURBL
Blocklist icon
UCEPROTECTuribl.com logoURIBL
Blocklist icon
8086 Consultancyabuse.ro logoabuse.rowiki.alphanet.ch logoALPHANETanonmails.de logoAnonmailsascams.com logoAscamswww.blockedservers.com logoBLOCKEDSERVERS
Blocklist icon
Brukalai.ltdnsbl.calivent.com.pe logoCalivent Networks
Blocklist icon
dan.me.uk
Blocklist icon
DrMx
Blocklist icon
DroneBLrbl.efnetrbl.org logoEFnet
Blocklist icon
Fabel
Blocklist icon
GBUdb
Blocklist icon
ImproWare
Blocklist icon
JIPPG Technologies
Blocklist icon
Junk Email Filterwww.justspam.org logoJustSpamwww.kempt.net logoKempt.net
Blocklist icon
Mail Babywww.nordspam.com logoNordSpam
Blocklist icon
nsZones
Blocklist icon
Polspam
Blocklist icon
RedHawkrv-soft.info logoRV-SOFT Technology
Blocklist icon
Schultewww.scientificspam.net logoScientific Spam
Blocklist icon
Spam Eating Monkeypsbl.org logoSpamikazewww.spamrats.com logoSpamRATSspfbl.net logoSPFBLsuomispam.net logoSuomispamwww.usenix.org.uk logoSystem 5 Hosting
Blocklist icon
Taughannock Networkswww.team-cymru.com logoTeam Cymru
Blocklist icon
Tornevall Networkssenderscore.org logoValiditywww.blocklist.de logowww.blocklist.de Fail2Ban-Reporting Servicezapbl.net logoZapBL2stepback.dk logo2stepback.dkfaynticrbl.org logoFayntic Servicesorbz.gst-group.co.uk logoORB UKdnsbl.technoirc.org logotechnoirc.orgwww.techtheft.info logoTechTheftwww.spamhaus.org logoSpamhaus0spam.org logo0Spam
Blocklist icon
Abusix
Blocklist icon
Barracuda Networkswww.spamcop.net logoCisco
Blocklist icon
Mailspikewww.nosolicitado.org logoNoSolicitado
Blocklist icon
SURBL
Blocklist icon
UCEPROTECTuribl.com logoURIBL
Blocklist icon
8086 Consultancyabuse.ro logoabuse.rowiki.alphanet.ch logoALPHANETanonmails.de logoAnonmailsascams.com logoAscamswww.blockedservers.com logoBLOCKEDSERVERS
Blocklist icon
Brukalai.ltdnsbl.calivent.com.pe logoCalivent Networks
Blocklist icon
dan.me.uk
Blocklist icon
DrMx
Blocklist icon
DroneBLrbl.efnetrbl.org logoEFnet
Blocklist icon
Fabel
Blocklist icon
GBUdb
Blocklist icon
ImproWare
Blocklist icon
JIPPG Technologies
Blocklist icon
Junk Email Filterwww.justspam.org logoJustSpamwww.kempt.net logoKempt.net
Blocklist icon
Mail Babywww.nordspam.com logoNordSpam
Blocklist icon
nsZones
Blocklist icon
Polspam
Blocklist icon
RedHawkrv-soft.info logoRV-SOFT Technology
Blocklist icon
Schultewww.scientificspam.net logoScientific Spam
Blocklist icon
Spam Eating Monkeypsbl.org logoSpamikazewww.spamrats.com logoSpamRATSspfbl.net logoSPFBLsuomispam.net logoSuomispamwww.usenix.org.uk logoSystem 5 Hosting
Blocklist icon
Taughannock Networkswww.team-cymru.com logoTeam Cymru
Blocklist icon
Tornevall Networkssenderscore.org logoValiditywww.blocklist.de logowww.blocklist.de Fail2Ban-Reporting Servicezapbl.net logoZapBL2stepback.dk logo2stepback.dkfaynticrbl.org logoFayntic Servicesorbz.gst-group.co.uk logoORB UKdnsbl.technoirc.org logotechnoirc.orgwww.techtheft.info logoTechTheftwww.spamhaus.org logoSpamhaus0spam.org logo0Spam
Blocklist icon
Abusix
Blocklist icon
Barracuda Networkswww.spamcop.net logoCisco
Blocklist icon
Mailspikewww.nosolicitado.org logoNoSolicitado
Blocklist icon
SURBL
Blocklist icon
UCEPROTECTuribl.com logoURIBL
Blocklist icon
8086 Consultancyabuse.ro logoabuse.rowiki.alphanet.ch logoALPHANETanonmails.de logoAnonmailsascams.com logoAscamswww.blockedservers.com logoBLOCKEDSERVERS
Blocklist icon
Brukalai.ltdnsbl.calivent.com.pe logoCalivent Networks
Blocklist icon
dan.me.uk
Blocklist icon
DrMx
Blocklist icon
DroneBLrbl.efnetrbl.org logoEFnet
Blocklist icon
Fabel
Blocklist icon
GBUdb
Blocklist icon
ImproWare
Blocklist icon
JIPPG Technologies
Blocklist icon
Junk Email Filterwww.justspam.org logoJustSpamwww.kempt.net logoKempt.net
Blocklist icon
Mail Babywww.nordspam.com logoNordSpam
Blocklist icon
nsZones
Blocklist icon
Polspam
Blocklist icon
RedHawkrv-soft.info logoRV-SOFT Technology
Blocklist icon
Schultewww.scientificspam.net logoScientific Spam
Blocklist icon
Spam Eating Monkeypsbl.org logoSpamikazewww.spamrats.com logoSpamRATSspfbl.net logoSPFBLsuomispam.net logoSuomispamwww.usenix.org.uk logoSystem 5 Hosting
Blocklist icon
Taughannock Networkswww.team-cymru.com logoTeam Cymru
Blocklist icon
Tornevall Networkssenderscore.org logoValiditywww.blocklist.de logowww.blocklist.de Fail2Ban-Reporting Servicezapbl.net logoZapBL2stepback.dk logo2stepback.dkfaynticrbl.org logoFayntic Servicesorbz.gst-group.co.uk logoORB UKdnsbl.technoirc.org logotechnoirc.orgwww.techtheft.info logoTechTheftwww.spamhaus.org logoSpamhaus0spam.org logo0Spam
Blocklist icon
Abusix
Blocklist icon
Barracuda Networkswww.spamcop.net logoCisco
Blocklist icon
Mailspikewww.nosolicitado.org logoNoSolicitado
Blocklist icon
SURBL
Blocklist icon
UCEPROTECTuribl.com logoURIBL
Blocklist icon
8086 Consultancyabuse.ro logoabuse.rowiki.alphanet.ch logoALPHANETanonmails.de logoAnonmailsascams.com logoAscamswww.blockedservers.com logoBLOCKEDSERVERS
Blocklist icon
Brukalai.ltdnsbl.calivent.com.pe logoCalivent Networks
Blocklist icon
dan.me.uk
Blocklist icon
DrMx
Blocklist icon
DroneBLrbl.efnetrbl.org logoEFnet
Blocklist icon
Fabel
Blocklist icon
GBUdb
Blocklist icon
ImproWare
Blocklist icon
JIPPG Technologies
Blocklist icon
Junk Email Filterwww.justspam.org logoJustSpamwww.kempt.net logoKempt.net
Blocklist icon
Mail Babywww.nordspam.com logoNordSpam
Blocklist icon
nsZones
Blocklist icon
Polspam
Blocklist icon
RedHawkrv-soft.info logoRV-SOFT Technology
Blocklist icon
Schultewww.scientificspam.net logoScientific Spam
Blocklist icon
Spam Eating Monkeypsbl.org logoSpamikazewww.spamrats.com logoSpamRATSspfbl.net logoSPFBLsuomispam.net logoSuomispamwww.usenix.org.uk logoSystem 5 Hosting
Blocklist icon
Taughannock Networkswww.team-cymru.com logoTeam Cymru
Blocklist icon
Tornevall Networkssenderscore.org logoValiditywww.blocklist.de logowww.blocklist.de Fail2Ban-Reporting Servicezapbl.net logoZapBL2stepback.dk logo2stepback.dkfaynticrbl.org logoFayntic Servicesorbz.gst-group.co.uk logoORB UKdnsbl.technoirc.org logotechnoirc.orgwww.techtheft.info logoTechTheft

We check 144 blocklists

www.spamhaus.org logo
Spamhaus Blocklist (SBL)
Organization
Spamhaus
Zone
sbl.dq.spamhaus.net
Type
IP
Impact
High
Delisting
Manual
www.spamhaus.org logo
Spamhaus Domain Blocklist (DBL)
Organization
Spamhaus
Zone
dbl.dq.spamhaus.net
Type
Domain
Impact
High
Delisting
Manual
www.spamhaus.org logo
Spamhaus Exploits Blocklist (XBL)
Organization
Spamhaus
Zone
xbl.dq.spamhaus.net
Type
IP
Impact
High
Delisting
Manual
www.spamhaus.org logo
Spamhaus Policy Blocklist (PBL)
Organization
Spamhaus
Zone
pbl.dq.spamhaus.net
Type
IP
Impact
High
Delisting
Manual
www.spamhaus.org logo
Spamhaus ZEN Blocklist
Organization
Spamhaus
Zone
zen.dq.spamhaus.net
Type
IP
Impact
High
Delisting
Manual
0spam.org logo
0Spam Block List (BL)
Organization
0Spam
Zone
bl.0spam.org
Type
IP
Impact
Medium
Delisting
Manual
Definition

What is a blocklist?

A blocklist, often called a blacklist, is a real-time database of IPs and domains with a poor reputation. The most common types are the Real-time Blackhole List (RBL) and the DNS-based Blackhole List (DNSBL), which are used by providers to reject malicious mail. There's also new types of hash based blocklists that are used to block emails based on their content.
Removal process

How do I get removed from a blocklist?

You must first identify which list has listed you, as each blocklist operator maintains its own unique delisting process, some are also automated. After fixing the root cause, you must visit their website to request removal, a process that can vary significantly from one list to another. Visit our specific blocklist pages above for detailed removal instructions.
Causes

How do you get blocklisted?

Listings occur for many reasons and are dependent on the blacklist operator. A high spam complaint rate can land you on a spam-focused list (SBL), sending from a compromised PC on an exploits list (XBL), using a residential IP on a policy list (PBL), or including bad links can get your domain listed (URIBL or DBL).
Monitoring

How can I monitor blocklists?

Proactive monitoring is key to protecting your reputation across the hundreds of active email blacklists, including combined, domain-based (RHSBL), and new-domain lists (ZRD). Our platform gives you the ability to monitor all blocklists in real-time and provides instant notifications when an issue is detected. Sign up to get started.

Blocklist guides

19 resources
What is a DNSBL and how does it affect email deliverability?
What is a DNSBL and how does it affect email deliverability?
Learn what a DNSBL (Domain Name System-based Blackhole List) is, how it works, and why it's a critical factor in your email deliverability. Understand how you can get listed and what to do to resolve it.
Blocklist guide
A guide to RBLs (real-time blackhole lists)
A guide to RBLs (real-time blackhole lists)
Learn what a Real-time Blackhole List (RBL) is and how it impacts your email deliverability. This guide covers how RBLs work, why your domain or IP might get on a blacklist (or blocklist), and the crucial steps to check your status and request removal. Understand the importance of fixing the root cause to maintain a clean sending reputation.
Blocklist guide
A brief history of email blacklists and blocklists
A brief history of email blacklists and blocklists
Explore the fascinating history of email blacklists and blocklists, from their origins as simple text files in the 1990s to their role in today's complex email deliverability landscape. Learn how these spam-fighting tools evolved, the controversies they sparked, and why they remain a critical component for any email sender to monitor and understand.
Blocklist guide
The difference between a blacklist and a blocklist
The difference between a blacklist and a blocklist
Learn the difference between the terms 'blacklist' and 'blocklist' in the context of email deliverability. Understand why the industry is shifting terminology and what it means for your email strategy.
Blocklist guide
How email blacklists actually work: a simple guide
How email blacklists actually work: a simple guide
Learn how email blacklists (or blocklists) actually work, from what they are and why they exist to the common reasons you might end up on one. We'll cover the difference between IP and domain blacklisting, the signals that anti-spam services look for, and how you can check if your domain has been flagged. Ultimately, understanding this system is the key to improving your sending practices and ensuring your emails reach the inbox.
Blocklist guide
Spam traps: what they are and how they work
Spam traps: what they are and how they work
Spam traps, or honeypots, are a tool used by internet service providers and anti-spam organizations to identify senders with poor email practices. Hitting one can severely damage your sender reputation, leading to your emails being blocked or sent to the spam folder. This guide explains the different types of spam traps, how you might hit one, and most importantly, the proactive steps you can take- like practicing good list hygiene and using double opt-in- to keep your email lists clean and your deliverability high.
Blocklist guide
A guide to the different types of email blocklists
A guide to the different types of email blocklists
Learn about the different types of email blocklists (also known as blacklists) and how they impact your email deliverability. This guide breaks down IP-based, domain-based, public, and private blocklists, explaining how you can get listed and, more importantly, how to stay off them. Understand the crucial role of sender reputation and proactive monitoring to ensure your emails reach the inbox.
Blocklist guide
Public vs private blacklists: what's the difference?
Public vs private blacklists: what's the difference?
Learn the critical difference between public and private email blocklists. This post breaks down how each type of blacklist works, why you might get listed, and the specific steps you need to take to get removed. Understand that public lists like Spamhaus are transparent, while private lists from providers like Gmail and Microsoft are internal and require a different approach to fix your deliverability.
Blocklist guide
What are the different types of spam traps and how do they work?
What are the different types of spam traps and how do they work?
Learn about the different kinds of email spam traps, from pristine honeypots designed to catch spammers to recycled addresses from inactive users. This guide explains what they are, how they can damage your sender reputation and land you on a blacklist, and provides actionable steps for maintaining a clean email list to avoid them.
Blocklist guide
What happens when your domain is on an email blacklist?
What happens when your domain is on an email blacklist?
Discover the far-reaching impact of being on an email blocklist or blacklist. This article explores how being listed affects your email deliverability, damages your sender reputation, and disrupts business operations. Learn about the immediate consequences, the long-term reputational harm, and the steps required for recovery and prevention to keep your crucial email channels open.
Blocklist guide
What does it mean when your email is blacklisted?
What does it mean when your email is blacklisted?
Learn what it means to be on an email blacklist, also known as a blocklist. This guide explains why domains and IPs get blacklisted, how these lists work, and the impact they have on your email deliverability. Discover the steps to check if you're on a blacklist and the process for getting removed to restore your sender reputation.
Blocklist guide
What is an email blacklist and how does it work?
What is an email blacklist and how does it work?
An email blacklist, or blocklist, is a real-time database of IP addresses and domains that are blocked by mail servers due to a history of sending spam. Being listed can severely impact your email deliverability. This guide explains what email blacklists are, how they work, the common reasons for being listed such as high spam complaints or poor list hygiene, and the steps you can take to check your status, request removal, and prevent it from happening again.
Blocklist guide
What is email backscatter and how to stop it
What is email backscatter and how to stop it
Ever received a bounce message for an email you never sent? This phenomenon is called email backscatter, and it occurs when spammers spoof your email address. This guide explains how backscatter happens, the dangers it poses to your sender reputation and its potential to land you on a blacklist. Learn how to protect your domain from this disruptive issue using email authentication like SPF, DKIM, and DMARC.
Blocklist guide
A guide to the blacklists yahoo mail uses
A guide to the blacklists yahoo mail uses
Wondering why your emails aren't reaching Yahoo users? Yahoo Mail uses a sophisticated system to filter spam, relying on a combination of well-known public blacklists, like Spamhaus, and its own private, internal blocklist. This guide explains how this hybrid system works, how you can determine if you've been listed, and the steps you need to take to repair your sender reputation and get your emails back into the inbox.
Blocklist guide
How your email address ends up on a blacklist
How your email address ends up on a blacklist
Getting your email address or domain on a blacklist is a common but serious deliverability issue that prevents your messages from reaching the inbox. This typically happens due to specific sending practices, such as high spam complaint rates, poor list hygiene that leads to hitting spam traps, and suspicious sending behavior. This post explains the primary reasons you might get blacklisted and outlines the steps necessary to diagnose the problem, get removed from blocklists, and prevent it from happening again through proactive reputation management.
Blocklist guide
What happens when your domain is put on a blocklist?
What happens when your domain is put on a blocklist?
Discover what happens when your domain is blocklisted, from immediate email deliverability failures to long-term reputation damage. Learn the common causes, such as high spam complaints and poor list hygiene, and understand the steps to check your status and begin the recovery process.
Blocklist guide
A practical guide to understanding your email domain reputation
A practical guide to understanding your email domain reputation
Learn what email domain reputation is and why it's more important than ever for your email deliverability. This guide covers the key components of your reputation score, the difference between IP and domain reputation, and practical steps you can take to monitor, protect, and improve this critical marketing asset.
Blocklist guide
Understanding email greylisting and how it works
Understanding email greylisting and how it works
A deep dive into email greylisting, a common anti-spam technique. This post explains how greylisting works by temporarily delaying unknown emails, discusses its pros and cons, compares it to blacklisting, and offers guidance for senders to ensure their legitimate emails aren't overly impacted by this filtering method.
Blocklist guide
What happens when your IP gets blocklisted?
What happens when your IP gets blocklisted?
Discover what happens when your IP address gets blocklisted and how it impacts your email deliverability and web access. This guide explains the common reasons for being blacklisted, from high spam complaints to compromised systems, and outlines the immediate consequences. Learn how to check if your IP is on a blacklist and the essential steps to get it removed and, most importantly, how to prevent it from happening again.
Blocklist guide
What causes an IP to be listed on CBL and how can it be resolved?
What to do if listed in Spamhaus and other blacklists?
Which email blacklists are most important to monitor for deliverability issues?
Why is my IP repeatedly blocklisted by Spamhaus XBL?
What are examples of insignificant or ineffective email blocklists?
How to remove IP address from Spamhaus PBL list?
What is the impact of being on the UCEPROTECTL3 blacklist and how to deal with it?
How does an IP address being on a blocklist affect domain reputation and email open rates?

Start improving your email deliverability today

Get started
Product
DMARC monitoring
Blocklist monitoring
Tools
DMARC record generator
Blocklist checker
Email tester
Resources
Blog
Guides
Knowledge base
Company
About
Trust and security

Suped

Privacy policy
Terms of service
© 2025 Suped Pty Ltd
LinkedInX