Have I Been Pwned

Have I Been Pwned (HIBP) is a foundational cybersecurity platform engineered by Troy Hunt, serving as the world's most comprehensive repository of historical and real-time data breaches. In 2026, it remains the critical infrastructure layer for credential stuffing prevention and identity verification services globally. Technically, HIBP utilizes a sophisticated k-Anonymity model for password verification, ensuring that full password hashes are never transmitted over the wire, thus maintaining user privacy while allowing for precise matching against over 800 million compromised credentials. The platform's architecture is built on Azure, leveraging globally distributed caches to provide sub-second latency for API requests. For enterprises, HIBP provides a high-throughput API v3 and domain-wide monitoring, allowing security teams to automatically detect and remediate employee credential exposures before they can be weaponized in Account Takeover (ATO) attacks. Its market position is solidified through strategic partnerships with password managers like 1Password and Bitwarden, as well as integration into major web browsers, making it an indispensable tool for modern DevSecOps and incident response workflows.