IP Blacklist Check
Check an IP address's reputation and whether it appears on major blocklists.
# free & rate-limited · no signup
Three quick steps
Enter an IP
Paste any IPv4 address to review.
Live lookup runs
We check reputation and blocklist status.
Read results
See reputation, risk, and blocklist flags.
Reputation score
A reputation and risk rating for the IP.
Blocklist status
Whether the IP appears on major lists.
Threat signals
Known abuse and threat intelligence.
Connection context
ISP and connection type context.
Who uses it
Email senders
Check sending IP reputation.
Security
Screen inbound connections.
Fraud teams
Flag known-bad IPs.
Developers
Automate reputation checks.
FAQ
Is this IP blacklist check tool free?
Yes. It's free and rate-limited with no signup required to try. For higher volume and API access, create a free account with 1,000 lookups included.
How accurate are the results?
This free tool returns demo results to show what the API delivers. The production API is sourced from carrier, regulatory, and authoritative data updated daily.
Can I use this in bulk or via API?
Yes. Sign up for API access to run single lookups, bulk CSV jobs, and async processing with webhooks — all on one universal credit balance.