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Check if your IP address is listed on major email and spam blacklists.
Email blacklists (DNSBLs) are databases of IP addresses known to send spam or malicious emails. Internet service providers (ISPs) and email services use these lists to filter out unwanted emails.
Our IP Blacklist Check Tool scans over 50 major DNS-based Blackhole Lists (DNSBL) and Real-time Blackhole Lists (RBL) to determine if your IP address or domain has been flagged for spam, malware, or suspicious activity. Being on a blacklist can severely impact email deliverability, preventing your messages from reaching recipients' inboxes. This tool provides a comprehensive health check of your IP reputation, helping you identify and resolve delivery issues. It checks major databases including Spamhaus, Barracuda, SORBS, SpamCop, and many others to give you a complete reputation analysis.
Enter an IP address or domain name to checkOur system queries over 50 reputable DNSBL/RBL databases in real-timeWe check if your IP is listed on spam, malware, or botnet listsResults are displayed instantly showing "Listed" or "Clean" statusDetailed reports include which specific list flagged the IPLinks and instructions for delisting are provided where available
Troubleshoot why emails are going to spam folders, verify new mail server IP reputation, and diagnose delivery failures.
Identify if internal systems are part of a botnet, check for compromised servers, and monitor network security health.
Ensure shared hosting IPs aren't affecting your brand and verify reputation status after cleaning malware hacks.
We don't log or store any IP addresses or search queries. Your privacy is hard-coded into our architecture.
All data is transmitted over encrypted HTTPS with TLS 1.3, ensuring end-to-end security.
Results are generated in real-time through temporary memory, never written to persistent disks.
IPs get blacklisted primarily for sending spam, mass emails, or being infected with malware/botnets. However, you might also be listed if you're using a dynamic residential IP (which shouldn't send mail directly), if you inherited a "dirty" IP from a previous user, or if your server has an open relay. False positives can also happen if you send a sudden large volume of legitimate email.
To get removed (delisted), first identify which list has flagged you using our tool. Visit their specific website (e.g., Spamhaus.org) and follow their removal instructions. Usually, this involves proving you've fixed the underlying issue (like securing a compromised account or closing an open relay) and requesting a review. Removal can take anywhere from a few hours to a week depending on the list.
Yes, being listed on major blacklists like Spamhaus or Barracuda often causes emails to be rejected or sent straight to the junk/spam folder by major providers like Gmail, Outlook, and Yahoo. Even if you're only on a minor list, it can degrade your domain reputation score and lower your overall deliverability rates.
They are essentially the same thing. RBL stands for "Real-time Blackhole List" and DNSBL stands for "Domain Name System Blacklist". They both use the DNS protocol to allow mail servers to quickly check if a sender's IP is associated with spam. The terms are used interchangeably in the industry.
The PBL (Policy Block List) by Spamhaus lists IP ranges that should not be sending email directly (like residential broadband IPs). Being on the PBL is normal and good for most residential users, as it prevents infected home computers from being used as spam bots. If you are running a legitimate mail server, you should be using a static business IP, which wouldn't be on the PBL.