The IP Blacklist & Reputation Checker allows you to quickly determine whether an IP address is listed on common blacklists and assess its overall reputation.
IP reputation plays a critical role in email deliverability, network security, and abuse prevention. This tool helps identify whether an IP has been flagged for spam, malware, or suspicious activity. All checks are performed in real time without storing your data.
What This Tool Can Do
• Check if an IP address is listed on known DNS-based blacklists (DNSBLs)
• Identify potential spam or abuse history associated with an IP
• Help diagnose email delivery and reputation issues
• Useful for IPv4 and supported IPv6 addresses
• Simple, fast, and browser-based interface
IP Blacklist & Reputation Checker
Check if an IPv4 or IPv6 address appears on common DNS-based blacklists. Results are informational only and do not imply wrongdoing.
Blacklists (DNSBL/RBL) are reputation lists used mainly for email and abuse filtering. Listings can be temporary, automated, and context-dependent. Always verify with your provider before taking action.
What Is an IP Blacklist?
An IP blacklist is a database of IP addresses that have been reported or detected for abusive behavior.
Key properties:
- Reputation-based (behavior over time matters)
- Used by mail servers, ISPs, and security systems
- Listings can be temporary or permanent
Being listed does not always mean malicious intent — shared hosting and NAT can cause false positives.
What Is IP Reputation?
IP reputation is a score or trust level assigned to an IP address based on its historical behavior on the internet.
An IP’s reputation can be affected by:
• Sending spam or bulk unsolicited email
• Hosting malware or phishing content
• Being part of a botnet or proxy network
• Repeated abuse or suspicious traffic patterns
Email providers, firewalls, and security platforms use reputation data to decide whether to allow, limit, or block traffic.
Best Practices to Maintain a Good IP Reputation
• Avoid sending unsolicited bulk email
• Secure servers against malware and abuse
• Use proper email authentication (SPF, DKIM, DMARC)
• Monitor outbound traffic regularly
• Request delisting once issues are resolved