What is an IP blacklist (DNSBL)?

An IP blacklist (DNSBL) is a database used by mail servers to block or filter messages from IPs associated with spam or abuse.

How can I check if my IP is blacklisted?

Enter your mail server IP into MailTested’s IP Blacklist Checker to query major DNSBL providers like Spamhaus, Barracuda, SORBS and more.

Listings can happen due to spam from your network, malware, open relays, or poor shared-hosting neighbors. The report shows who listed you and why when available.

How do I remove my IP from a blacklist?

Use the delisting link shown next to each blacklist in your results. Most providers offer a removal form once issues are fixed.

Check Your IP Reputation with the IP Blacklist Checker

Instantly test your mail server IP across major DNS-based blacklists (DNSBLs). Detect listings on Spamhaus, Barracuda, SORBS, and more to fix email deliverability issues fast.

🚀 Step 1: Enter Your Mail Server IP

Explore more tools: SPF Checker • SPF Generator • DKIM Checker • DMARC Checker

Learn more: Fix a Blacklisted IP • What Is a DNSBL? • Improve Email Deliverability

📘 IP Blacklist Checker — Frequently Asked Questions

An IP blacklist (DNSBL) is a database that lists IP addresses sending spam or malicious traffic. Email providers reference these lists to block untrusted sources.

MailTested queries your IP across multiple DNSBLs in real time and shows which lists flag it as “listed” or “clean.” Each entry links directly to removal pages.

After identifying the listing service, follow the “View / Remove” link provided in the MailTested report. Most blacklists allow manual delisting after cleanup.

When your IP is on a blacklist, major email providers may reject or flag your messages as spam. Regular checks with MailTested help maintain a clean sender reputation.

📨 Why IP Blacklist Checks Matter

Blacklists affect whether your emails reach inboxes or get blocked entirely. Regular IP reputation checks ensure your mail servers remain trusted and compliant with global anti-spam networks.

MailTested’s IP Blacklist Checker scans your IP against top DNSBL providers like Spamhaus ZEN, Barracuda, and Spamcop. Results show listing counts, explanations, and removal links for each service.

🧩 Why Use MailTested’s IP Reputation Tool

Unlike simple DNS lookups, MailTested performs simultaneous queries across major blacklists and summarizes your results in one clean report. It’s ideal for system admins, marketers, and hosting providers monitoring outbound mail health.

📄 Common IP Blacklist Examples

Spamhaus ZEN: Comprehensive spam source database.

Barracuda Reputation Block List: Blocks IPs known for large-scale spam or open relays.

SORBS: Lists dynamic or compromised systems sending bulk mail.

Spamcop: Community-driven reporting system for recent spam senders.