Email & Domain Blacklist Monitoring

Monitor IPv4, IPv6 addresses, and domains against hundreds of blocklists in real-time. Instant alerts protect your email deliverability and reputation.

Free for your first host, no credit card required. Learn about the free plan →

RBL Scan
Listed
Host 203.0.113.42
Blocklists Checked 142
Flagged 2
Listed On
Spamhaus ZEN Barracuda BRBL
140 clean 2 listed

What Is Blacklist Monitoring?

Real-time blocklist monitoring is essential for email deliverability and online reputation.

Protect Email Deliverability

Monitor for blocklistings that prevent email delivery.

IPv4 & IPv6 Support

Support for IPv4, IPv6 addresses, and netblock monitoring.

Domain Monitoring

Monitor domains against URI blocklists to protect brand reputation.

Hundreds of Data Sources

Hundreds of RBL and URIBL sources, including premium threat intelligence.

Instant Alerts

Immediate notification when listings are detected through your preferred channel.

Detailed Reports

Historical reporting and shareable public reports for compliance.

The Complete Guide to Email Blacklist Monitoring covers fundamentals, triggers, delisting, and operations in one reference.

See how RBL monitoring works, view RBL monitoring pricing, or read the RBL monitoring FAQ.

Inside the Portal

A look at what you actually work with every day.

Host listings view in the Generator Labs portal Host listings view in the Generator Labs portal

Listings Get Expensive by the Hour.

Every hour you're listed, mail bounces and sender reputation decays. We close that gap to minutes and tell you which data source flagged you and why, so you're fixing the cause, not hunting for it.

Blocklist source selection in a monitoring profile Blocklist source selection in a monitoring profile

Which Data Sources to Trust Is Our Problem, Not Yours.

We evaluate data sources, track reliability, and swap out stale providers so the curated default stays current. Customize the selections when you know what you want; rely on the defaults when you don't.

Check history with public report links Check history with public report links

Hand Over Proof, Not Prose.

When your mail stops flowing, an ISP or customer will ask for proof. A public report they can open and verify themselves ends the conversation on the first reply. Also monitor your SSL certificate infrastructure.

Scale with Confidence

Monitoring infrastructure at enterprise scale

30B+
Total Checks Performed
500K+
Active Hosts Monitored
10M+
Daily Monitoring Checks
45+
Countries Served

Comprehensive Data Sources

Monitor against hundreds of data sources, including major RBLs, URIBLs, ISP reputation systems, and phishing feeds.

Facebook Threat Exchange

Access threat data from hundreds of companies including Facebook, Tumblr, and Dropbox.

PhishTank

Detect if your domains are flagged for phishing. Learn about PhishTank monitoring.

Microsoft SNDS

Know when Microsoft turns your sending IPs yellow or red for Outlook and Hotmail. Learn about SNDS monitoring.

DNS Security Providers

Integrates with Quad9, OpenDNS, and other DNS security providers.

Custom RBL Sources

Add your own blocklist sources for complete coverage.

Google Postmaster Tools

Get alerted when your Gmail spam rate climbs or your domain fails Google's sender requirements. Learn about Postmaster Tools monitoring.

See the complete data source inventory for every source we monitor, or jump to a dedicated page: Microsoft SNDS monitoring, PhishTank monitoring, IP and domain reputation check, or the blacklist monitoring service.

Trusted by Industry Leaders

Thousands of companies trust Generator Labs.

Comparing alternatives? See how Generator Labs stacks up against MxToolbox and HetrixTools.

Prefer a PDF? Download the Blacklist Monitoring datasheet or the white paper The Real Cost of Email Blacklisting.

Start Monitoring Today

Free plan available. No credit card required.