Blacklist / RBL Checker

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Extended check +30 more lists — includes regional & niche RBLs

Querying blacklists for … This may take up to 30 seconds.

IP Checked

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✓ Clean

📋 Blacklist Results

Results grouped by blacklist category — listed entries shown first within each group

Results reflect each blacklist's live DNS state at the moment of this query. Re-running the check may return slightly different results.

Blacklist	Category	Status	Delist

How to Use the Blacklist / RBL Checker

Enter Your IP Address or Domain Name

Type your mail server IP address (e.g. 203.0.113.5) or your domain name (e.g. example.com) into the input field. If you enter a domain, the tool automatically resolves it to its IP address before checking — the resolved IP is shown in your results.

Choose Standard or Extended Check

The standard check covers 30+ of the most widely-used blacklists — the ones that actually affect email deliverability with Gmail, Outlook, and Yahoo. Toggle Extended to add 30+ regional and niche lists for a thorough sweep. For most users, the standard check is all you need.

Click Check Blacklists and Review Results

The tool queries all lists in real time and returns a color-coded table — red rows are listings, green rows are clean. The summary card at the top shows your total listed count, clean count, and an overall severity rating from Clean to Blacklisted.

Use the Delist Links to Request Removal

Every blacklist where your IP is listed shows a direct Delist link to that list's removal request page. Fix the underlying problem first — spam complaints, compromised server, missing SPF or DMARC records — then submit the removal request. Requesting removal without fixing the root cause results in re-listing.

Frequently Asked Questions

What is an RBL or DNSBL?

RBL stands for Real-time Blackhole List. DNSBL stands for DNS-Based Blacklist. These are databases maintained by anti-spam organizations that track IP addresses and domains known to send spam, host malware, or operate abusive mail servers. Mail servers around the world query these lists before accepting incoming email — if your IP is listed, your emails may be rejected or routed to spam without any notification to you.

Why are my emails going to spam or being rejected?

A blacklist listing is one of the most common and least obvious causes of email delivery failure. Run your sending IP through this tool first. If you find listings, the most impactful ones to clear are Spamhaus ZEN, Barracuda BRBL, and SpamCop — these are the lists used by the largest number of mail servers worldwide. Also check that your domain has valid SPF and DMARC records, which help prevent your domain from being flagged in the first place.

What is the difference between standard and extended checks?

The standard check covers approximately 30 of the highest-impact DNS blacklists — the ones that actually affect deliverability with Gmail, Outlook, Yahoo, and most corporate mail gateways. The extended check adds an additional 30+ regional, niche, and supplementary lists for a more thorough sweep. For diagnosing most email delivery problems, the standard check is sufficient. Use the extended check if you want comprehensive coverage or are troubleshooting issues with regional mail providers.

Can I enter a domain name instead of an IP address?

Yes. Enter your domain name and the tool automatically resolves it to its A record IP address using DNS, then checks that IP against all blacklists. The resolved IP is displayed in the results header so you know exactly what was checked. This is useful when you know your domain but not the specific IP address of your mail server. Note that DNSBL checks are IP-based — the tool resolves your domain to check the IP it points to.

How do I get removed from a blacklist?

Each blacklist has its own removal procedure. This tool provides a direct Delist link for every blacklist where your IP is found — click the link to go to that list's removal request page. The critical step is fixing the underlying cause of the listing before requesting removal: clean up spam complaints, secure any compromised accounts, add SPF and DMARC records to your domain, and ensure your mail server is properly configured. Submitting a removal request without fixing the root cause typically results in being re-listed within days or weeks.

Which blacklists matter most for email deliverability?

Spamhaus ZEN (which combines the SBL, XBL, and PBL zones) has the broadest adoption and the single greatest impact on deliverability with Gmail, Outlook, and Yahoo Mail. Barracuda BRBL is the most important list for corporate email gateways and enterprise mail servers. SpamCop is widely used by smaller ISPs and hosting providers. If your IP is clean on Spamhaus and Barracuda, the vast majority of your email will reach its destination. Listings on smaller regional or niche lists typically cause minor delivery issues at best.

What does the severity rating mean?

The severity rating summarizes the overall seriousness of your blacklist situation. Clean means no listings found on any checked list. Caution means 1–2 listings — usually on lower-impact or niche lists, worth monitoring but may not be causing significant delivery problems yet. At Risk means 3–5 listings — likely causing some delivery failures, particularly with certain mail providers, and worth addressing promptly. Blacklisted means 6 or more listings — almost certainly causing significant email delivery problems that require immediate attention.

Blacklist & Results Glossary

New to email blacklists? These definitions explain what each result status means, what your severity rating tells you, and what the individual blacklist names actually check for.

Result States

Listed

Your IP address was found on this blacklist. Mail servers that query this list may reject or filter email coming from your IP. Use the Delist link to request removal after fixing the root cause.

Clean

Your IP address is not on this blacklist. No action needed for this list. A clean result means this particular list will not block your outgoing email.

N/A — Timeout or Error

The blacklist did not respond within the allowed time, or returned an unexpected result. This does not mean you are listed — it means the result is inconclusive for this particular list. Try again or check that list directly.

Severity Ratings

Clean

No listings found on any checked blacklist. Your IP has a healthy reputation and should not be experiencing email delivery problems related to blacklisting.

Caution

1–2 listings found, typically on lower-impact or niche lists. Email delivery may not be visibly affected yet, but you should investigate and request removal to prevent the situation from worsening.

At Risk

3–5 listings found. Your IP is likely causing some email delivery failures, particularly with smaller ISPs or corporate mail gateways. Prompt action is recommended — identify the cause and begin requesting removal from each listed blacklist.

Blacklisted

6 or more listings found. This is a serious deliverability problem. A significant portion of your outbound email is likely being rejected or routed to spam. Immediate action is required — secure your mail server, fix authentication records, and begin the delisting process on every listed entry.

Blacklist Names Explained

Spamhaus ZEN

zen.spamhaus.org

The most widely-used and highest-impact blacklist in existence. ZEN combines Spamhaus SBL, XBL, and PBL in a single query. A listing here will block your email with Gmail, Outlook, Yahoo, and most major mail providers.

Spamhaus SBL

sbl.spamhaus.org — Spamhaus Block List

Lists IP addresses confirmed as sending spam or controlled by known spammers. A manual-review listing — more serious than an automated listing.

Spamhaus XBL

xbl.spamhaus.org — Exploits Block List

Lists hijacked computers, open proxies, and malware-infected systems sending spam. If listed here, your server or a device on your network may be compromised.

Spamhaus PBL

pbl.spamhaus.org — Policy Block List

Lists IP ranges that should not be sending email directly — typically residential ISP and dynamic IP ranges. Static mail server IPs can request removal. Dynamic (home internet) IPs should route through their ISP's SMTP relay.

Spamhaus DBL

dbl.spamhaus.org — Domain Block List

A domain-based blacklist that flags domain names used in spam — not IP addresses. A DBL listing means your domain itself has been flagged, affecting deliverability even if your IP is clean.

Barracuda BRBL

b.barracudacentral.org

Maintained by Barracuda Networks, one of the largest enterprise email security vendors. Widely used by corporate mail gateways worldwide. A listing here blocks email at many businesses and organizations.

SpamCop BL

bl.spamcop.net

Built from spam reports submitted by SpamCop users. IPs are listed when they generate enough reports and are automatically removed after 24 hours with no new reports. Widely used by ISPs and smaller mail providers.

Invaluement SIP

sip.invaluement.com — Sender IP Reputation

A private subscription-based blacklist focused on spam-sending IPs. SIP stands for Sender IP — it lists IPs identified as chronic spam sources. Used by mail filtering systems and hosting providers. A listing means your IP has been flagged for sending unsolicited email.

UCEProtect L1 / L2 / L3

dnsbl-1, dnsbl-2, dnsbl-3.uceprotect.net

Three tiers of coverage. L1 lists individual spam-sending IPs. L2 lists entire ranges where too many IPs are sending spam. L3 lists entire ISP networks. Note: UCEProtect charges for expedited removal, which is controversial in the email industry.

SORBS

dnsbl.sorbs.net — Spam and Open Relay Blocking System

One of the oldest blacklists, covering multiple categories via sub-zones: spam senders, open relays, open proxies, dynamic ranges, and more. The combined zone is the most widely checked. Impact varies by sub-zone.

CBL / Abusix

cbl.abuseat.org — Composite Blocking List

Lists IPs detected sending spam directly, particularly from systems exhibiting botnet or malware behavior. Uses automated detection from spam traps. A listing strongly suggests your server or a network device is compromised or misconfigured.

Blocklist.de

bl.blocklist.de

A German-operated blacklist collecting attack reports from servers running fail2ban and intrusion detection systems. Lists IPs involved in brute-force attacks, SSH scanning, and automated attacks — not just email spam.

Backscatterer

ips.backscatterer.org

Lists mail servers that send backscatter — automated bounce messages sent in response to forged spam using your domain as the sender. Backscatter floods innocent third parties and is itself treated as spam.

PSBL

psbl.surriel.com — Passive Spam Block List

A conservative blacklist populated from spam trap data. Easy to get listed on (one spam to a trap = listed) but also easy to remove from — uses an automatic no-questions-asked removal system.

GBUdb Truncate

truncate.gbudb.net

GBUdb tracks the ratio of good to bad email from each IP. The Truncate zone lists IPs with an overwhelmingly bad reputation — meaning nearly all email from that IP has been identified as spam or malicious.

SpamRATS

all.spamrats.com

Focuses on IPs with no valid PTR (reverse DNS) record, dynamic IP ranges, or confirmed spam senders. Particularly relevant for mail servers without proper reverse DNS configuration.

SenderScore

bl.score.senderscore.com

Operated by Validity. SenderScore assigns a 0–100 reputation score to sending IPs. The BL zone lists IPs with scores low enough to indicate a spam source. A low score can affect deliverability with major mailbox providers even without a formal blacklist listing.

SURBL & URIBL

multi.surbl.org / multi.uribl.com

URI-based blacklists that flag domain names found inside email bodies — not the sending IP. If your domain appears in spam messages (even spam you did not send), it can be listed here, causing your emails to be filtered even with a clean sending IP.

How to Use the Blacklist / RBL Checker

Frequently Asked Questions

Blacklist & Results Glossary

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