IP Blacklist Checker
Check if an IP address or domain is listed on 15+ spam and malware blacklists including Spamhaus ZEN, SpamCop, Barracuda, SORBS, ABUSEAT CBL, DroneBL, and more. Enter domain or IP.
How to Use IP Blacklist Checker
- 1Enter an IP address or domain name to check.
- 2The tool resolves domains to their IPv4 address automatically.
- 3Your IP is checked against 15+ DNSBL (DNS-based Blackhole List) services simultaneously.
- 4Listed entries show the list name, return code, and what the listing means.
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Frequently Asked Questions
Why is my IP on a blacklist and how do I get removed?▾
IPs end up on blacklists for several reasons: sending spam (directly or via a compromised machine), running an open proxy, malware infection, or being on a dynamic/residential IP range. To get removed: (1) Identify and fix the root cause (scan for malware, patch the server, close open relays). (2) Visit the specific blacklist's website — most have a self-service delisting form. (3) For Spamhaus, go to spamhaus.org/lookup. For SpamCop, spamcop.net. For Barracuda, barracudacentral.org/rbl/removal-request. Delisting is usually immediate once the underlying issue is fixed.
How do blacklists affect email deliverability?▾
Major email providers (Gmail, Outlook, Yahoo) check Spamhaus ZEN and SpamCop before accepting email. If your sending IP is listed on Spamhaus ZEN, your emails will be rejected with a 5xx permanent failure. Listing on smaller blacklists may cause soft bounces (4xx) or spam folder delivery. The most impactful blacklists to avoid: Spamhaus ZEN > SpamCop > Barracuda > ABUSEAT CBL. If you're on multiple lists simultaneously, you likely have an active spam-sending issue that needs immediate remediation.
What is Spamhaus ZEN and why is it the most important blacklist?▾
Spamhaus ZEN is a combined lookup that checks Spamhaus SBL (Spamhaus Block List — spam sources), XBL (Exploits Block List — compromised machines sending spam), and PBL (Policy Block List — IPs that should not be sending email directly). ZEN is used by thousands of ISPs and email providers. Return codes indicate why you're listed: 127.0.0.2 = SBL (active spammer), 127.0.0.4 = XBL (infected machine), 127.0.0.10-11 = PBL (dynamic/end-user IP — expected for residential connections).
My IP shows listed on PBL — is this a problem?▾
The Spamhaus Policy Block List (PBL) lists IP ranges that ISPs have declared should not send email directly (end-user/dynamic IPs). If your IP is only on PBL, it's not because you sent spam — it's your ISP's policy. This won't affect deliverability if you send email through your ISP's SMTP relay or a dedicated email service (SendGrid, Mailgun, SES). It only affects attempts to send email directly from port 25. If you run a mail server on a static business IP, you can request PBL removal at pbl.spamhaus.org.
How often should I check my IP reputation?▾
For production mail servers: check weekly or set up monitoring. For web servers: check monthly. Signs you should check immediately: email bounce rates spike, customers report email not delivering, your server starts sending unusual outbound traffic (potential compromise). If you're setting up a new dedicated IP for email, check it before warming up — new IPs may inherit listings from previous tenants. Always check before migrating email sending to a new IP.