Assetnote is an attack surface management platform founded in 2018 that provides continuous security monitoring of external attack surfaces. The company was founded by security professionals with backgrounds in offensive security and bug bounty hunting, and has been acquired by Searchlight Cyber.

The platform offers continuous asset discovery and inventory capabilities, monitoring over 3 million assets concurrently across customer environments. It performs deep asset enrichment by identifying and contextualizing assets with over 3,800 different technologies. The Assetnote Exposure Engine runs more than 17,000 high-signal exposure checks against each customer environment to identify security vulnerabilities and misconfigurations.

The platform is designed for security teams at organizations ranging from startups to Fortune 500, FTSE 100, and ASX 200 companies. Use cases include continuous asset discovery and inventory management, real-time exposure monitoring, attack surface reduction, mergers and acquisitions security assessment, and bug bounty program readiness.

Assetnote emphasizes accuracy and actionable intelligence, claiming 99.99% accuracy for verified assets and exposures. The platform features collaborative workflows and customization options to integrate with existing security operations. The company's founders and team members have presented security research at conferences including DEF CON, Black Hat Asia, BSides Las Vegas, Hack in the Box, and OWASP.