IPWhois.net Blacklist
FreemiumLiveLast verified 24 Sept 2026
Community-sourced blacklist to check and report abusive IP addresses by threat type.
Example request
curl -s 'https://bl.ipwhois.net/api/check?ip=1.2.3.4'
Free tier, in plain English
500 free checks a day per IP with no signup; an API key raises the limit further.
Alternatives in Threat Intel
AbuseIPDBCrowd-sourced IP address reputation and abuse reports for blocking malicious traffic.FreemiumAlienVault Open Threat Exchange (OTX)Looks up threat intelligence on IPs, domains, URLs, and files: malware, passive DNS, and geo data.CensysSearch engine for internet-connected hosts: open ports, services, certificates and banners.FreemiumDefend NetworkDaily JSON feed of exploited CVEs with CVSS/EPSS scores and CISA KEV status, no key needed.FreeEmailRepReputation and risk score for an email address from breach, blacklist, and abuse signals.