How to Check if Your Domain or IP Is Blacklisted
To check if your domain is blacklisted, enter it in the free Blacklist Checker on pdfseotools.com. The tool finds the domain's IPv4 address and checks it against about 80 spam blacklists (DNSBLs) such as Spamhaus and SORBS, showing "Listed" or "Not listed" for each.
Key facts
- Checks the domain's IPv4 address against ~80 DNSBLs
- Shows Listed / Not listed for each list
- Shared hosting can be listed because of other sites on the same IP
- Delist only after fixing the cause
Why blacklists matter
✓🌐 Mail servers consult blacklists before accepting messages. If your server IP is listed, invoices, contact-form replies and newsletters can land in spam or be rejected outright. Browsers and security tools also use some lists to warn visitors.
How to check – step by step
Step 1: Enter your domain
Open the Blacklist Checker and type your domain.
Step 2: Start the check
The tool resolves the IP and queries each blacklist.
Step 3: Review the results
Look for any "Listed" entries and note which lists they are.
If you are listed
✓- Find the cause: check for hacked plugins, unprotected contact forms, compromised email passwords or bulk mail sent without consent.
- Fix it: update software, add CAPTCHA to forms, change passwords, scan for malware.
- Set up authentication: add SPF, DKIM and DMARC records for your domain.
- Request delisting: visit each list's website and follow its removal steps.
- On shared hosting: contact your host – they may move you to a clean IP.
Stay off blacklists
- Send marketing email through a reputable email service, not your web server.
- Only email people who opted in, and include an unsubscribe link.
- Protect forms with CAPTCHA or honeypot fields.
- Check your listing status monthly and after any security incident.
Open the Blacklist Checker on pdfseotools.com – free, no sign-up and it works on any device.
Frequently Asked Questions
What does the Blacklist Checker test?
It finds the IPv4 address of your domain and checks it against about 80 public DNS-based blacklists (DNSBLs), including Spamhaus, SORBS and UCEPROTECT lists.
Why is my domain listed when I never sent spam?
On shared hosting, another site on the same IP may have sent spam. A hacked contact form or compromised email account on your site can also send spam without you knowing.
How do I get removed from a blacklist?
Fix the cause first, then use the removal (delisting) form on that blacklist's website. Some lists remove entries automatically after a period without spam.
Is one listing a big problem?
It depends on the list. Major lists such as Spamhaus can stop your email reaching inboxes; small lists may have little effect.
Some lists say "dynamic IP" or "PBL". What does that mean?
Lists like Spamhaus PBL include home and dynamic IP ranges that should not send email directly. A web server listed there usually needs a properly configured mail server or an email service.
Does this check email addresses?
No. It checks the domain's server IP. Email deliverability also depends on SPF, DKIM and DMARC records.
Summary
A quick blacklist check can explain sudden email problems. Fix the cause, add SPF/DKIM/DMARC, then request delisting. Run the Blacklist Checker and explore more free domain tools.
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