What does a blacklist check actually test?

It queries major DNS-based blocklists for your domain or IP and reports which lists return a hit. Each listed result includes the blocklist's stated reason category where available.

I am listed on a blacklist. How do I get removed?

Fix the root cause first, typically a compromised account or a spammy campaign. Then submit the delisting form published by that specific blocklist. Removal times range from hours to several days.

Does being listed mean my email goes to spam?

Not automatically. Some receivers weigh certain DNSBLs heavily, others ignore them. A listing is a strong warning signal, though, and major listings like Spamhaus often cause real delivery problems.

Email Blacklist Checker - Free IP & Domain Lookup

About This Tool

This page provides original, human-reviewed information about DNSBL blacklist checking, explaining how major blocklists work, what a listing means, and the typical delisting process for domains and IPs.

Understanding the Blacklist Check Results

The result table shows one row per DNS-based blocklist queried. A clean run shows all lists as not listed; any hit needs attention, but its severity depends on which list it is.

Not Listed

The blocklist returned no record for your domain or IP. This is the expected result and means that list does not currently consider you a spam source.

Listed

The blocklist has an entry for your domain or IP. Check the listed reason category, fix the root cause such as a compromised account or open relay, then request delisting from that provider.

High-impact lists

Spamhaus SBL/XBL and similar lists are consulted by many large mailbox providers, so a hit there usually causes real delivery failures. Smaller lists may only affect a few receivers.

Query errors

A timeout or DNS error for one list means the check for that list is inconclusive, not that you are listed. Re-run the check, and treat repeated errors for the same list as inconclusive too.

What are Email Blacklists?

Email blacklists are databases of IP addresses and domains that have been identified as sources of spam, malware, or other unwanted email. Email providers use these lists to filter incoming mail.

Types of Blacklists:

IP BlacklistsBlock specific IP addresses known for sending spam

Domain BlacklistsBlock domains used in spam or phishing campaigns

URI BlacklistsBlock URLs commonly found in spam messages

Impact on Email Delivery:

Being listed on a blacklist can severely impact your email deliverability, causing legitimate emails to be blocked or sent to spam folders.

Major Blacklist Providers

Spamhaus ZEN

Spamhaus ZEN (SBL+CSS+XBL+PBL)

spam

Spamhaus SBL

Spamhaus Block List

spam

Spamhaus CSS

Spamhaus CSS List

spam

Spamhaus XBL

Spamhaus Exploits Block List

exploits

Spamhaus PBL

Spamhaus Policy Block List

policy

SPAMCOP

SpamCop Blocking List

spam

Barracuda BRBL

Barracuda Reputation Block List

reputation

SORBS DNSBL

Spam and Open Relay Blocking System

relay

CBL

Composite Blocking List

composite

PSBL

Passive Spam Block List

spam

UCEPROTECTL1

UCEPROTECT Level 1

spam

UCEPROTECTL2

UCEPROTECT Level 2

spam

UCEPROTECTL3

UCEPROTECT Level 3

spam

RATS Dyna

Spamrats Dynamic IP List

dynamic

RATS NoPtr

Spamrats No PTR List

noptr

RATS Spam

Spamrats Spam Sources

spam

0SPAM

0SPAM Blacklist

spam

0SPAM RBL

spam

Anonmails DNSBL

spam

BACKSCATTERER

Backscatterer List

backscatter

BLOCKLIST.DE

Blocklist.de

attacks

CALIVENT

Calivent Blacklist

spam

CYMRU BOGONS

Team Cymru Bogons

bogons

DAN TOR

DAN TOR Exit Nodes

tor

DAN TOREXIT

DAN TOR Exit List

tor

DRMX

DRMX Blacklist

spam

DRONE BL

Drone BL

bots

FABELSOURCES

Fabel Sources

spam

HIL

Hostkarma Blacklist

reputation

HIL2

Hostkarma Blacklist 2

reputation

ICMFORBIDDEN

ICM Forbidden

spam

IMP SPAM

IMP Spam List

spam

IMP WORM

IMP Worm List

malware

INTERSERVER

InterServer IP Reputation

reputation

ivmSIP

ivmSIP Blacklist

sip

ivmSIP24

ivmSIP24 Blacklist

sip

JIPPG

JIPPG Blacklist

spam

KEMPTBL

Kemp Technologies Blacklist

spam

Konstant

Konstant Blacklist

spam

LASHBACK

Lashback UBL

spam

MAILSPIKE BL

Mailspike Blacklist

spam

MAILSPIKE Z

Mailspike Z List

reputation

MSRBL Phishing

phishing

MSRBL Spam

spam

NETHERRELAYS

Nether Relays

relay

NETHERUNSURE

Nether Unsure

unsure

Nordspam BL

Nordspam Blacklist

spam

NoSolicitado

NoSolicitado DNSBL

spam

RBL JP

RBL Japan

spam

s5h.net

s5h.net Blacklist

spam

SCHULTE

Schulte Blacklist

spam

SEM BACKSCATTER

SEM Backscatter

backscatter

SEM BLACK

SEM Black List

spam

Sender Score Reputation Network

Sender Score Reputation

reputation

SERVICESNET

Services.net Blacklist

spam

Suomispam Reputation

reputation

SWINOG

SWINOG Blacklist

spam

TRIUMF

TRIUMF Blacklist

spam

TRUNCATE

Truncate Blacklist

spam

Woodys SMTP Blacklist

smtp

ZapBL

ZapBL Blacklist

spam

Spamhaus DBL

Spamhaus Domain Block List

domain

SURBL Multi

SURBL Multi (Spam URI Realtime Blocklists)

uri

URIBL Multi

URIBL Multi (All Lists)

uri

URIBL Black

URIBL Black List

uri

URIBL Red

URIBL Red List

uri

URIBL Grey

URIBL Grey List

uri

ivmURI

ivmURI Domain Blacklist

uri

Nordspam DBL

Nordspam Domain Block List

domain

SEM FRESH

SEM Fresh Domain List

fresh

SEM URI

SEM URI Blacklist

uri

SEM URIRED

SEM URI Red List

uri

SORBS RHSBL BADCONF

SORBS RHSBL Bad Configuration

config

SORBS RHSBL NOMAIL

SORBS RHSBL No Mail

nomail

Blacklist Removal Process

Follow these steps to successfully remove your IP/domain from blacklists

Step 1: Identify the Problem

• Determine which blacklists have listed your IP/domain
• Understand the reason for the listing
• Check for any security compromises or spam activity

Step 2: Fix the Root Cause

Security Issues: Remove malware, patch vulnerabilities, change passwords

Spam Activity: Identify and stop spam sources, implement better email practices

Configuration Problems: Fix open relays, secure mail servers

Content Issues: Review and improve email content and sending practices

Step 3: Request Removal

• Visit the blacklist provider's website
• Look for removal request or delisting forms
• Provide detailed information about the fixes implemented
• Be patient - removal can take 24-48 hours or longer

Step 4: Monitor and Prevent

• Implement regular blacklist monitoring
• Set up email authentication (SPF, DKIM, DMARC)
• Monitor email sending reputation
• Maintain good email hygiene practices

Common Removal URLs

Spamhaus

SBL, XBL, CSS, PBL removal

SpamCop

SpamCop Blocking List

Barracuda

BRBL removal request

SURBL

SURBL analysis

Preventing Blacklist Issues

Best Practices:

Implement proper email authentication (SPF, DKIM, DMARC)

Use double opt-in for email subscriptions

Monitor bounce rates and remove invalid addresses

Secure your mail servers and websites

Regularly check your blacklist status

Handle spam complaints promptly

Frequently Asked Questions

Common questions about blacklists and email deliverability

How often should I check blacklists?

For active email senders, check weekly or monthly. For high-volume senders, consider daily monitoring or automated alerts. After any security incident or delivery issues, check immediately.

Why was my IP/domain blacklisted?

Common reasons include:

• Sending spam or spam-like content
• Compromised email accounts or servers
• Poor email list hygiene (high bounce rates)
• Lack of proper email authentication
• Being part of a compromised IP range

How long does blacklist removal take?

Removal times vary by provider. Some automatic removals happen within hours, while manual reviews can take 24-72 hours.Repeat offenders may face longer delays or permanent listings.

Can I prevent blacklisting?

Yes, follow these best practices:

• Implement SPF, DKIM, and DMARC authentication
• Maintain clean email lists with regular hygiene
• Monitor sending reputation and delivery metrics
• Use double opt-in for email subscriptions
• Secure your email infrastructure
• Follow email marketing best practices

What if removal requests are denied?

If denied, review the feedback carefully, address any remaining issues, and wait before resubmitting.Some lists have waiting periods. Consider contacting the provider directly for clarification.

Do all blacklists affect email delivery?

No, different email providers use different blacklists. Some are more influential than others.Major providers like Gmail, Outlook, and Yahoo have their own internal reputation systems that may be more important than third-party blacklists.