WWDC 2025 - iOS 26 Network Extension: URL Filtering Revolution for Enterprise and Consumer Apps

The WWDC 2025 update to the Network Extension framework introduced significant advancements, particularly in URL Filtering, for iOS developers building security and content filtering solutions. The Network Extension framework provides core capabilities for remote access solutions, including Network Relays and IP-based VPNs. The MASQUE protocol eliminates the need for custom extension development, and configuration can be done using the NERelayManager API or MDM configuration profiles. VPN implementation best practices include route enforcement options and essential bypass options. A critical migration warning notes that Network Extension is the only supported VPN API, and legacy implementations will break system integration. The revolutionary URL Filtering architecture is built on privacy-first design principles, featuring a zero-knowledge architecture and four-technology foundation. The implementation architecture requires server infrastructure setup, Apple infrastructure integration, and client implementation. The URL Filtering technology provides advantages over traditional filtering methods, including full URL access and resource-specific blocking capability. The technology has various use case applications, including parental controls, enterprise security, and educational institutions. The technical implementation notes highlight system integration, entitlement requirements, and development workflow considerations.