IP Blacklist API provides a service for checking the reputation of IP addresses by determining if they appear on known malicious IP blocklists. The tool is designed to help identify both inbound threats, such as attackers and spammers, and outbound threats, including command-and-control servers and malware hosts. It delivers information on whether an IP is blacklisted, the nature of any associated threat, and the threat level.
The API returns detailed data about queried IP addresses, including geolocation information such as country, region, city, timezone, coordinates, postal code, continent, and accuracy radius. It distinguishes between inbound and outbound threat activities, providing descriptions for each when relevant. Designed for integration, the API can be used with various tools, supporting use cases in email deliverability, fraud prevention, and security monitoring.
Developers access the service via a RESTful endpoint, with response times under 200 milliseconds and a 99.9% uptime SLA. A free tier is available without requiring a credit card, allowing users to obtain an API key and make live queries. Documentation and resources are provided to facilitate implementation.
IP Blacklist API is an API design, testing & docs product. It focuses on determining if an IP address is blacklisted to prevent spam, fraud, or security threats in applications. IP Blacklist API is a B2B product aimed at developers. There is a free tier. It runs on the command line and API.
Behind IP Blacklist API is APIVerve, and the product first shipped in 2025. The project is developed in the open on GitHub with 33 commits in the last 90 days. Among its 7 catalogued features are IP reputation check, blocklist lookup, and threat intelligence. It exposes integrations via a public API.
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