A blacklist check scans an IP address against dozens of blocklists and reputation databases to produce a complete reputation picture. Use robtex.com to aggregate results from RBLs, spam databases, and security lists in one query.
Beyond Basic RBL Queries
Individual RBL checks tell you about one list. Comprehensive blacklist checking queries many sources simultaneously:
- Email blocklists - Traditional RBLs focused on spam sources
- Security lists - IPs associated with malware, botnets, or attacks
- Reputation databases - Aggregate scoring from multiple signals
- Specialized lists - Regional, industry-specific, or niche databases
Who Needs Comprehensive Checking
Email administrators - Verify sending reputation before campaigns. Monitor ongoing deliverability.
Security teams - Check IPs appearing in logs against known-bad databases.
Hosting providers - Screen new customers and monitor for abuse.
Marketers - Ensure email infrastructure isn't compromised before launches.
Reading Aggregate Results
Not all listings are equal. A Spamhaus SBL listing is serious; an obscure regional list matters less. Results should be weighted by:
List reputation - Major lists (Spamhaus, Barracuda) are widely used. Minor lists may have questionable methodology.
Listing reason - Policy listings (like Spamhaus PBL) aren't accusations of wrongdoing. Spam source listings are.
Listing age - Recent listings suggest active problems. Old listings may be outdated.
Your use case - Dynamic IP on PBL doesn't matter for browsing. It matters for sending email directly.
Taking Action on Results
Clean results mean current good standing - but reputation can change. Monitor regularly.
Listings require investigation. Identify why the listing occurred before requesting removal, or you'll be relisted immediately.
Multiple listings across major RBLs indicate serious problems requiring immediate attention.