Blacklist Lookup: Check If Your Domain Is Blacklisted

What Is the Blacklist Lookup?

The Blacklist Lookup is a free online tool on SEO Stack Tools that helps digital marketers, content creators and web developers accomplish important tasks quickly and accurately. No registration, no download, no cost.

Whether you need help with IP blacklist, spam blacklist or email blacklist, the Blacklist Lookup delivers reliable results every time — completely free.

Why You Need the Blacklist Lookup

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Key Features

Fast Accurate Results

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All Devices Supported

Fully responsive design ensures the Blacklist Lookup works perfectly on desktops, laptops, tablets and smartphones.

No Registration Required

Completely open-access — no sign-up, no email, no profile. Just visit and start working immediately.

How to Use the Blacklist Lookup

1. Open the Blacklist Lookup on SEO Stack Tools
2. Enter the required information
3. Click the action button
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Who Should Use It?

The Blacklist Lookup is perfect for SEO professionals, content creators, web developers, small business owners and students who need to complete digital marketing tasks quickly and accurately.

FAQ

Is it really free?

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Do I need an account?

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Does it work on mobile?

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Conclusion

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Why Domain Blacklist Status Matters for Email and SEO

When your domain or IP address appears on an email blacklist (also called a blocklist or DNSBL), your emails are rejected or sent to spam by receiving mail servers that check against that list. This can devastate email deliverability for transactional emails, newsletters, and business communications. Domain blacklisting can also impact your SEO if Google identifies your domain as a known spam or malware source.

Common Blacklists That Affect Deliverability

• Spamhaus: The most widely used blacklist; being listed here severely impacts email deliverability globally
• SORBS: Spam and Open Relay Blocking System; used by many ISPs
• Barracuda: Widely used in enterprise email security systems
• Microsoft SNDS: Microsoft own complaint and blacklist system affecting Outlook and Hotmail delivery
• Google Postmaster: Google domain reputation system affecting Gmail delivery rates

How to Get Removed from a Blacklist

Identify the cause of blacklisting first — typically a spam complaint spike, compromised email account sending spam, or an open mail relay on your server. Fix the underlying issue completely, then submit a delisting request through the blacklist management portal. Delisting can take 24–72 hours after the request is processed.

Preventing Blacklisting in the First Place

• Set up SPF, DKIM, and DMARC correctly — these email authentication standards prove your domain actually sent a given email, making it much harder for spammers to spoof your domain and trigger blacklisting on your behalf. Missing or misconfigured records are one of the most common preventable causes of deliverability problems.
• Warm up new sending domains and IPs gradually — a brand-new domain or IP suddenly sending high volumes of email looks identical to spam behavior to receiving mail servers. Ramping up volume gradually over days or weeks builds sending reputation before you need to rely on high-volume delivery.
• Maintain list hygiene — regularly removing bounced, inactive, and unengaged email addresses from your sending list keeps your complaint and bounce rates low, which are the primary signals mail providers use to judge sender reputation.
• Monitor for compromised accounts — a single compromised email account sending spam through your domain's mail server can get your entire domain blacklisted within hours. Enable two-factor authentication and monitor for unusual sending volume spikes.

Blacklist Types: DNSBL vs. URIBL vs. Reputation Services

Not all blacklists check the same thing. DNSBLs (DNS-based Blacklists) primarily check sending IP addresses against known spam sources. URIBLs check domains referenced in email body content (links pointing to known spam or phishing domains), which matters if your domain gets mentioned or linked in spam sent by someone else, not just email you send yourself. Reputation services (like Google Postmaster Tools or Microsoft SNDS) go further, tracking ongoing sender behavior metrics like spam complaint rate and engagement over time rather than a simple binary listed/not-listed status. A comprehensive blacklist check should cover multiple list types, since a domain can be clean on DNSBLs while still having a damaged reputation score with a specific provider like Gmail or Outlook.

Frequently Asked Questions

How do I know if my domain is blacklisted?

Use the SEO Stack Tools Blacklist Lookup to check your domain against major blacklists simultaneously. You can also check Google Search Console for manual action notices related to spam or malware.

Can a blacklisted domain still rank in Google?

Depending on the blacklist type, yes. Email blacklists primarily affect email delivery, not search rankings. However, if Google identifies your domain as a malware or phishing host, it will trigger a manual action that removes your pages from search results.

Does shared hosting increase blacklist risk?

Yes. On shared hosting, your domain shares an IP address with hundreds of other sites. If a neighbouring site sends spam, your shared IP may be blacklisted — affecting your email deliverability even if your own site is clean.

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Quick Tips for Keeping Your Domain Off Blacklists

• Check After Every Server Migration: When you move to a new server, you inherit the IP address's history. Always run a blacklist check on your new server's IP immediately after migration to catch any pre-existing reputation issues.
• Monitor Email Delivery Rates: A sudden drop in email open rates or delivery can indicate your sending domain or IP has been blacklisted. Run a blacklist check immediately if you notice your emails going to spam at a higher rate than usual.
• Request Removal Promptly: Most blacklist operators provide a removal request process. Once you have resolved the underlying issue, submit a removal request and follow up within 48 hours if there is no response from the list operator.