// free tool
Blacklist Checker
Check if your domain or IP address appears on major email blacklists that could impact your email deliverability.
Sign up for 25 free search credits every 30 days, no credit card required.
// how it works
How to use Blacklist Checker
- 01
Enter domain or IP
Type your domain name or IP address into the input field above.
- 02
Scan blacklists
Click Check to scan against 15 major DNS-based blacklist databases simultaneously.
- 03
View results
See which blacklists flag your domain or IP with direct links to check via the Tomba API.
// features
Why use Blacklist Checker
Multi-blacklist scan
Checks your domain or IP against 15 of the most widely used DNS-based blacklist databases at once.
Spamhaus, Barracuda & SORBS
Covers the top blacklists including Spamhaus ZEN, Barracuda BRBL, SORBS, SpamCop, and UCEPROTECT.
Instant results
Get a full overview of your blacklist status across all major databases in under a second.
Domain & IP support
Works with both domain names and IPv4 addresses for comprehensive reputation checking.
Deliverability insights
Understand which blacklists could be causing your emails to land in spam or get rejected.
No signup required
Use the tool instantly without creating an account or providing any personal information.
// use cases
Who uses Blacklist Checker
Email admins
Monitor your mail server IPs and domains to ensure they are not listed on any major blacklists.
IT teams
Troubleshoot email delivery issues by checking if your infrastructure is flagged by spam databases.
Marketers
Verify your sending domain reputation before launching large email campaigns to maximize inbox delivery.
Domain buyers
Check the reputation of a domain before purchasing to avoid inheriting blacklist entries from previous owners.