Free IP Blacklist Check — Is Your IP Address Blacklisted?
Check if your IP address is listed on major spam blacklists, DNSBL databases, and abuse blocklists. Protect your email deliverability and server reputation with our free IP blacklist checker tool. Scan against Spamhaus, SORBS, Barracuda, and more.
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IP Blacklist & DNSBL Scanner
Enter an IP address to check if it appears on major spam, abuse, and reputation blacklists.
Check against Spamhaus, SORBS, Barracuda & more
Protect your email sender reputation
Real-time blacklist scanning
Learn how to get removed from blacklists
What Are IP Blacklists and Why Should You Check Them?
IP blacklists — also called blocklists or DNSBLs (DNS-based Blackhole Lists) — are databases of IP addresses that have been flagged for sending spam, distributing malware, hosting phishing sites, or engaging in other forms of internet abuse. Email servers, firewalls, and security products worldwide query these blacklists in real time to decide whether to accept, reject, or quarantine incoming connections from a given IP address.
If your mail server's IP address appears on one or more blacklists, your outgoing emails may be rejected outright, silently dropped, or routed to recipients' spam folders. This can devastate business communication and marketing campaigns. Regularly checking your IP against blacklists is a critical part of maintaining healthy email deliverability and server reputation.
How Do IP Blacklists Work?
Most blacklists are maintained by anti-spam organizations that collect reports of abuse, run spam traps (honeypot email addresses), and analyze global traffic patterns. When an IP is flagged, it's added to the blacklist and published in a DNS-queryable format. There are dozens of well-known blacklists, each with different criteria and severity levels. Spamhaus is the most widely used and maintains multiple lists (SBL, XBL, PBL). SORBS tracks spam sources and open relays. Barracuda maintains a reputation system used by their email security appliances. SpamCop relies heavily on user reports.
Why Might Your IP Be Blacklisted?
Common reasons include: a compromised server or computer sending spam without your knowledge, misconfigured mail server acting as an open relay, shared hosting IP where another user sent spam, sending bulk email without proper opt-in consent, or your IP being in a residential or dynamic range that some lists block by default. Even legitimate senders can be blacklisted if they trigger spam filters by sending too many emails too quickly or having a high bounce rate.
How to Get Removed from a Blacklist (Delisting)
First, identify the root cause — secure any compromised servers, close open relays, and ensure proper email authentication (SPF, DKIM, DMARC). Then visit each blacklist's website to find their delisting process. Most provide a self-service removal form once you've addressed the underlying issue. Getting delisted typically takes 24-48 hours but can take longer for repeat offenders.
Preventing Future Blacklisting
Maintain proper email authentication records (SPF, DKIM, DMARC) in your DNS. Monitor your sending reputation using feedback loops from major email providers. Keep your servers patched and secure to prevent compromise. Use double opt-in for mailing lists and monitor bounce rates. Consider using a dedicated IP for email sending rather than sharing with web hosting.
To check your DNS authentication records, use our DNS lookup tool. For IP geolocation and ISP details, try our IP address lookup. To see domain registration info, use WHOIS lookup. To see your current IP, use What is my IP; for VPN detection, ping test, or traceroute, see our network tools.
Privacy, Accuracy & Security
Privacy: We don’t store your IP or scan history. Accuracy: We query major DNSBLs in real time; results reflect current list status. Security: All requests use HTTPS. No signup required.
Frequently Asked Questions About IP Blacklists
How do I check if my IP is blacklisted?
Enter your IP address in the tool above and click "Check Blacklist." The tool will scan your IP against major DNSBL databases including Spamhaus, SORBS, Barracuda, and others, showing you which lists (if any) have flagged your IP.
What happens if my IP is on a blacklist?
If your IP is blacklisted, emails sent from that IP may be rejected or sent to spam by receiving mail servers. The impact depends on which blacklist — being on Spamhaus has a much bigger effect than being on a smaller list.
How long does it take to get delisted?
Delisting typically takes 24-48 hours after you submit a removal request and fix the underlying issue. Some blacklists automatically remove IPs after 1-2 weeks of clean behavior, while others require manual removal requests.
Can a shared hosting IP be blacklisted?
Yes. If you're on shared hosting and another user on the same IP sends spam, the entire IP gets blacklisted, affecting all users. This is why businesses often use dedicated IPs or specialized email sending services.
Is this blacklist checker free?
Yes, our IP blacklist check tool is completely free. No signup, no API key, and no limits on the number of checks you can perform.