IP Reputation APIs
IP reputation APIs tell you whether an address has a history of abuse before you let it through. AbuseIPDB and the IPWhois.net Blacklist rely on community reports, IP99 scores proxy, VPN and datacenter risk without a key, and Pulsedive enriches IPs alongside domains and URLs. Web of Trust combines user ratings with ML models.
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
AbuseIPDBCrowd-sourced IP address reputation and abuse reports for blocking malicious traffic. Identity & Security › Threat Intel | Freemium | API key | JSON | 1k–10k/day | Live |
IP99IP address risk scoring — proxy, VPN, and datacenter detection — plus city-level geolocation, no key needed. Location & Mapping › IP Geolocation | Freemium | None | JSON | 1k–10k/day | Live |
IPWhois.net BlacklistCommunity-sourced blacklist to check and report abusive IP addresses by threat type. Identity & Security › Threat Intel | Freemium | None | JSON | 100–1k/day | Live |
PulsediveThreat intelligence lookups for IPs, domains, and URLs with risk scoring and IOC enrichment. Identity & Security › Threat Intel | Freemium | API key | JSON | — | Live |
Web of TrustDomain and IP reputation/safe-browsing scores from WOT's user community and ML models. Identity & Security › Threat Intel | Free trial | — | Untested |
AbuseIPDBFreemiumLive
Crowd-sourced IP address reputation and abuse reports for blocking malicious traffic.
API key · JSON
1k–10k/day
no machine-readable spec
IP99FreemiumLive
IP address risk scoring — proxy, VPN, and datacenter detection — plus city-level geolocation, no key needed.
None · JSON
1k–10k/day
OpenAPI spec · MCP server · llms.txt
IPWhois.net BlacklistFreemiumLive
Community-sourced blacklist to check and report abusive IP addresses by threat type.
None · JSON
100–1k/day
no machine-readable spec
PulsediveFreemiumLive
Threat intelligence lookups for IPs, domains, and URLs with risk scoring and IOC enrichment.
API key · JSON
—
llms.txt
Web of TrustFree trialUntested
Domain and IP reputation/safe-browsing scores from WOT's user community and ML models.
·
—
no machine-readable spec
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Choosing an IP Reputation API
Is there a free IP Reputation API?
Yes. AbuseIPDB, Pulsedive, IP99 and IPWhois.net Blacklist have a free tier alongside paid plans.
Which IP Reputation APIs work without an API key?
IP99 and IPWhois.net Blacklist need no key or sign-up, so you can try them with a plain request.
Can I call an IP Reputation API from front-end JavaScript?
IP99 and IPWhois.net Blacklist allow cross-origin requests and need no key, so they work straight from the browser. For the others, call them from your server so your key stays private.
Can I use IP Reputation APIs in a commercial project?
AbuseIPDB, IP99 and Web of Trust permit commercial use. Pulsedive restricts it, for example to non-commercial or attributed use, so read the terms first.
Which IP Reputation APIs work with AI agents?
IP99 has both an MCP server and an OpenAPI spec.
Broader: Threat Intel APIs · Identity & Security APIs
More in Threat Intel: Phishing & Malicious URLs APIs · CVE & Vulnerabilities APIs · Data Breach APIs