DNSFilter

DNSFilter is a cybersecurity platform that provides content filtering and threat prevention services at the DNS (Domain Name System) level. It was founded in 2015 by Ken Carnesi and Brian Gillis. Headquartered in the United States, the company focuses on providing secure internet access for businesses of all sizes, government agencies, educational institutions, and service providers. DNSFilter particularly employs artificial intelligence (AI) and machine learning models to perform threat detection and content classification.

DNSFilter was developed as a response to the inadequacies of existing DNS security solutions. The company’s goal was to create a user-friendly DNS filtering solution capable of detecting threats earlier. In 2018, DNSFilter acquired Webshrinker, a threat classification engine, thereby enhancing its machine learning-based content analysis capabilities. The company continued its growth with a $33.5 million Series A investment from Insight Partners and Arthur Ventures in 2021. In 2023, it integrated Guardian, a privacy-focused mobile security solution, and in 2025 added Zorus, a platform tailored for Managed Service Providers (MSPs).

DNSFilter uses machine learning models that operate in real time to detect threats and filter content. The platform blocks over 200 million threats daily and processes more than 17 billion DNS queries per day. DNSFilter’s solution stands out by detecting threats on average 10 days earlier than its competitors. DNSFilter offers a wide range of deployment options. Through its Roaming Client applications, users remain protected even when outside the corporate network. The platform provides compatible clients for operating systems including Windows, macOS, iOS, Android, and Chrome OS. Centralized management is facilitated through Active Directory integration, API support, and integrations with tools such as Zapier and Rewst. Key technological components of DNSFilter include AppAware (application-level blocking), DNSSEC support, DNS tunneling and cache poisoning attack protection, Universal Lists (comprehensive black and white list management), Insights Reporting (a detailed reporting tool), Malicious Domain Protection, and SafeSearch policies. Additionally, it offers content filtering options compliant with CIPA requirements for educational institutions.

DNSFilter is used by organizations of all sizes to secure corporate networks. Educational institutions, public agencies, and nonprofit organizations also benefit from the platform. Furthermore, dedicated management tools for MSPs have been developed to support multi-customer environments. DNSFilter also provides content filtering and user security solutions for businesses offering public Wi-Fi services.

DNSFilter offers three main licensing options: Basic, Pro, and Enterprise. Each plan includes varying levels of security and management features. The platform operates on a per-user monthly licensing model, with advanced reporting, data export, support levels, and integration capabilities differing by plan. Special pricing options are available for educational institutions, public agencies, and MSPs.

DNSFilter is actively working to further enhance DNS security. The company’s vision is to transform cybersecurity by moving away from centralized systems toward more flexible and distributed architectures. Embracing the zero trust security model, DNSFilter aims to develop solutions that extend protection to endpoints. It continues to train its machine learning models to improve content filtering accuracy and to develop algorithms capable of detecting new threats more rapidly. With the integration of Zorus, DNSFilter plans to incorporate endpoint behavior analysis at the DNS level, contributing to multi-layered security solutions.