What this tool does
It checks a public IPv4 address, or the A records for a domain, against common DNS-based blacklist zones.
Reputation Check
Blacklist Checker
Check a public IP or domain against common DNSBL reputation lists used for mail filtering.
DNSBL checks
Mail reputation
Public IPs only
Clear results
Domain or IP
Resolve a domain A record or check an IPv4 directly.
Mail focused
Quickly spot reputation issues affecting deliverability.
Provider confirmation
Use results as a signal before provider-specific delisting.
Tool guide
How to interpret blacklist results
DNSBL reputation affects whether mail from an IP is accepted, filtered, or rejected by receiving servers.
Who it helps
- Mail administrators
- Hosting customers troubleshooting bounce messages
- Support teams checking IP reputation
Usage instructions
Enter a public IP or domain. If listings appear, confirm directly with the provider and review mail logs before requesting delisting.
Understanding the output
A clear result is a good signal, not a guarantee of inbox placement. A listing means reputation should be investigated and the underlying cause fixed first.
Why it matters for hosting
Hosting reputation is tied to mail practices, compromised accounts, scripts, and server hygiene. Delisting without fixing the cause rarely lasts.
