Blacklist Check
Check if an IP address or domain appears on major spam or security threat blacklists (DNSBL/RBL).
Mail servers and security systems share lists of IP addresses that have recently been caught
sending spam, brute-forcing logins, or doing other abusive things. This tool checks your IP
(or any IP you enter) against a handful of those public blacklists. Useful to find out whether
a "blocked" or "spam" verdict from another service has a known cause.
Checking blacklists...
What this means for you
- Listed — the IP showed up in that blacklist. Different lists track different kinds of bad behavior (spam, brute-force logins, malware, open proxy). Spamhaus is the most widely respected.
- Not listed — clean on the lists we check. This doesn't guarantee a perfect reputation everywhere, but it's the usual answer for a normal home or office IP.
- Most people will see "all clear". Listings are common for shared VPN exits, datacenter IPs, and compromised home routers.
When you'd check this
- A website is blocking you — if your IP is on a blacklist, that explains it. Some sites refuse traffic from listed IPs as a security measure.
- Your emails go to spam — your home or company mail server's IP being listed is a common cause. (For home users, your ISP probably already prevents you from running a mail server, so this is rare.)
- You're on a VPN or proxy — shared exit IPs frequently end up listed because someone else on the same exit misbehaved. This is one reason VPNs occasionally feel "broken" on certain sites.
What to do if you're listed
- Home / mobile IP: usually clears on its own when your IP changes (often within hours to days). If it doesn't, contact your ISP or VPN provider.
- VPN exit IP: switch VPN server. Most VPNs have many exits; pick one not currently listed.
- You run a mail server: each blacklist has a removal request page. You'll need to fix the root cause (compromised account, weak filtering, etc.) first.