DNSBL Blacklist Checker
Check whether a domain or IP appears on major email and reputation blacklists using public DNSBL zones.
Best for mail administrators, site owners, and incident response teams checking whether a sending IP or host has been flagged by public DNSBL providers.
What This Tool Checks
- Spamhaus, SpamCop, and UCEPROTECT lookups
- IPv4 resolution for domain targets
- Deliverability and reputation signals
Why It Matters
Blacklist listings can silently damage email deliverability and reputation long before anyone notices failed messages or spam-folder placement.
Best For
Best for mail administrators, site owners, and incident response teams checking whether a sending IP or host has been flagged by public DNSBL providers.
What To Do Next
Investigate the root cause of any listing, clean up compromised or misconfigured mail sources, then follow each provider delisting process.
Related Resources
What does the DNSBL Blacklist Checker look for?
DNSBL Blacklist Checker focuses on spamhaus, spamcop, and uceprotect lookups, ipv4 resolution for domain targets, deliverability and reputation signals. It is designed to help teams identify this category of weakness quickly and then move into broader workflows if deeper follow-up is needed.
What is the difference between Quick and Comprehensive mode?
Quick mode stays public for focused diagnostics. Comprehensive mode is intended for authenticated workflows where users need saved history, richer follow-up, and broader account-linked execution.
When should I use the full Vulnify platform instead?
Use the full platform when you need more than one focused diagnostic, want to keep reports and history, or need scheduled scans, exports, and broader vulnerability coverage beyond dnsbl blacklist checker.