// free security tool
IP Reputation Checker
Enter an IP address to check its reputation against public blocklists. If your mail or web server IP is listed, deliverability and trust suffer — this lookup shows where it appears and points you to the delisting steps for each source.
Check an IP free → Unlock Pro (100/mo)
What the lookup reports
- Listing status — which public blocklists currently flag the IP.
- Reputation context — signals associated with spam, abuse, or proxy/relay behavior.
- Next steps — where to request delisting once the cause is resolved.
How to act on a listing
Confirm the IP is yours and not shared, identify and stop the cause (malware, open relay, compromised account), then request delisting from each source. Re-check after changes propagate.
Prevent future listings
- Lock down outbound mail (SPF, DKIM, DMARC) and rate-limit senders.
- Monitor the IP so you are alerted the moment it is listed again.
Frequently asked questions
What blocklists does it check?
It queries widely used public DNS-based blocklists (DNSBLs) that mail servers and security tools consult to assess sender and host reputation.
Why is my IP blacklisted?
Common causes include compromised hosts sending spam, shared-hosting neighbors, open relays/proxies, or prior abuse on a recycled IP. The result indicates which lists flagged it.
How do I get delisted?
Each blocklist has its own delisting process. Fix the underlying cause first (secure the host, stop the abuse), then submit a delisting request to each list that flagged you.
Free vs Pro?
Free covers 1 lookup per month. Pro raises it to 100 per month with saved monitoring.