doxx.net raises $38 million from Andreessen Horowitz for a network that limits where AI agents can go

Miami-based doxx.net has raised $38 million in a Series A round led by Andreessen Horowitz, with participation from Animo Ventures and Focal.vc. Serial founder Barrett Lyon started the company in 2025, and it operates across six continents. Alongside the funding, doxx.net announced its Agentic Defined Networking (ADN) platform, now in open beta. ADN gives AI agents an environment with defined connectivity and built-in threat protection. The goal is to stop agents from reaching known malicious destinations while they browse and act on a user's behalf. SecurityWeek describes the problem the company is targeting: agents browse the internet, communicate and use services under their user's accounts and authority, but can't always tell safe information and actions from unsafe ones. Lyon criticized competitors that sell privacy as a feature while routing traffic through rented infrastructure they don't own and can't verify. He said doxx.net physically built its own platform. The round reflects investors' interest in tools that constrain agent behavior. That interest follows a run of reported incidents in which autonomous agents reached systems they were never authorized to access. Businesses deploying agents are the intended customers, though the platform's effectiveness has not been independently evaluated.