Domain resolution
Resolve the domain to website IP addresses before checking reputation.
100% Free • No Signup • Reputation Check
Blacklist Checker
Check domain and IP reputation across configured blacklist and DNSBL sources.
Domain lookup • IP lookup • Mail server IPs • DNSBL checks • Reputation status • No signup
Results depend on connected DNSBL/reputation sources. We show exactly which lists were checked.
What this checker reviews
One check reviews domain, website IP and mail server reputation signals where integrations are available.
Mail server IPs
Find MX records and check the IPs used by mail servers.
DNSBL lists
Check configured DNS-based blacklist providers.
Listed status
Show exactly which lists report a match.
Lookup errors
Separate clean results from timeouts, unavailable providers and unsupported checks.
Email deliverability context
Explain how blacklist status can affect email delivery and sender reputation.
Blacklist source transparency
Blacklist results are only shown when real sources are connected and checked.
Connected lists
Shows how many blacklist sources were checked.
Listed results
Only real matches from connected sources are shown.
Timeouts & errors
Provider failures are separated from blacklist matches.
Not connected
If no providers are active, no reputation verdict is shown.
Common blacklist issues this tool can detect
Find reputation signals that may affect email delivery or infrastructure trust.
- Possible listingDomain or IP appears on a blacklist
- Possible listingMail server IP appears on a DNSBL
- Possible listingWebsite IP appears on a reputation list
- DNS issueReverse DNS missing for mail server IP
- DNS issueMX host IP could not be resolved
- Provider timeoutSome blacklist providers timed out
- Not connectedBlacklist providers are not connected yet
- DNS issueNo mail server IPs found
How blacklist checking works
The checker resolves domain and mail server IPs, then checks configured reputation sources.
Enter a domain or IP
We clean the input, detect whether it is a domain or IP address, and validate the format.
Resolve related IPs
For domains, we check website IPs, MX records and mail server IPs where possible.
Check configured lists
The tool checks configured DNSBL or reputation providers and reports only real lookup results.
Understanding blacklist results
Clear
The checked IP or domain was not listed on the connected lists.
Listed
One or more connected lists returned a blacklist match.
Partial
Some checks completed, but one or more providers timed out or were unavailable.
Not connected
Blacklist providers are not connected yet, so no live reputation verdict is available.
Blacklist status is only one deliverability signal. SPF, DKIM, DMARC, reverse DNS and sending behavior also matter.
Preparing blacklist check…
Need help reviewing blacklist or reputation issues?
Send us your domain or IP report and we’ll review the issue.
Frequently asked questions
A blacklist check reviews whether a domain or IP appears on configured reputation or DNSBL lists.
A DNSBL is a DNS-based blacklist used by some mail systems and security tools to identify suspicious or abusive IP addresses.
No. Blacklist status is only one signal. SPF, DKIM, DMARC, reverse DNS, content quality and sending behavior also affect delivery.
Some providers may be unavailable, rate limited or not configured. Timeouts should be treated separately from blacklist matches.
Removal depends on the blacklist provider. Usually you must fix the underlying issue first, then request delisting from the provider.
No. The Blacklist Checker is free and does not require signup.