Skip to Navigation
Check if your IP is blacklisted and protect your email deliverability with a free IP blacklist checker.
Your IP isn’t listed in blocklist.
Listed in blocklist.
IP
RDNS
Blocklist
Not listed.
An IP blacklist checker is a tool that allows you to determine if your IP address has been listed in any email blacklist databases for suspicious activities or harmful activities, such as sending spam or unauthorized bulk emails.
An IP blacklist checker carries out the following actions in real time:
DNS record lookups: The tool queries DNS (Domain Name System) servers to find information associated with your IP address.
Database comparison: It cross-references your IP against multiple known blacklist databases, such as Spamhaus and Barracuda to identify any matches.
Blacklist status report: The tool generates a detailed report indicating whether your IP is listed on any blacklists, including the names of the databases.
An IP blacklist lookup tool is vital for several reasons:
Email deliverability: Ensuring emails sent from your IP address reach inboxes instead of landing in the spam folder or being blocked entirely by (Internet Service Providers) ISPs spam filters.
Maintaining reputation: Safeguarding your IP’s reputation, ensuring that your audience continues to trust communications from your business.
If your IP is found on a blacklist, follow these steps to resolve the issue:
Identify the blacklist: Use the tool’s report to pinpoint which database has blacklisted your IP.
Investigate the cause: Determine why your IP was flagged – this could include sending spam, a compromised mail server, or suspicious email-sending practices.
Resolve the issue: Secure your email server, update outdated software, remove malware, and review your email-sending practices. In addition, implement measures like throttling email volume or verifying recipient addresses to prevent future issues.
Request delisting: Contact the blacklist administrators, provide evidence that the issue has been addressed, and send a removal request.
Monitor regularly: Perform periodic IP blacklist checks to ensure your IP stays clean and avoid potential issues in the future.
Mailtrap Tip
If your IP was blacklisted due to spam caused by a security breach, resetting passwords and improving server security protocols is essential to regain trust and avoid repeat offenses.
An IP blacklist is a database of IP addresses identified as sending spam, engaging in suspicious / malicious activities, or being associated with malicious content. These blacklists are maintained by organizations and email service providers to protect users from potential online threats and ensure email and web safety.
To check if an IP address is blacklisted, you can use an IP blacklist checker tool. Simply enter the IP address into the tool’s search bar, and it will scan multiple blacklist databases to determine if your IP has been flagged.
The duration of an IP blacklist entry depends on the terms and policies of the specific blacklist. Some blacklists automatically remove IP addresses after a set period, such as 7 or 30 days, provided no further suspicious activity is detected. Others require a manual delisting request, where you must prove the issue has been resolved.
To resolve the issue of being placed on an IP blacklist, begin by identifying the blacklist and investigating the root cause, which could stem from spam complaints, unauthorized bulk emails, or security breaches. Once the issue is identified, take corrective actions such as securing your server, removing any malware, and improving email-sending practices by ensuring all recipients have opted in and avoiding behaviors that resemble spamming. After resolving the issue, request delisting by presenting evidence of the steps taken to address and prevent further problems.
