🛡️ IP Blacklist Checker
Check if an IP address is listed on major DNS-based blacklists (DNSBLs). Being listed can mean the IP has been used for spam, malware, or other abuse.
What is a DNS Blacklist (DNSBL)?
DNS-based blacklists maintain databases of IP addresses that have been reported for sending spam, distributing malware, or other abusive behavior. Email servers and firewalls query these lists to decide whether to accept traffic from an IP.
Why check your IP?
- Email deliverability: If your server IP is blacklisted, your emails may be rejected
- Website reputation: Blacklisted IPs can affect your site's trustworthiness
- Security audit: Check if your network has been compromised
- IP purchase due diligence: Verify reputation before buying IP blocks