Security researchers have identified that iCloud Private Relay, Apple’s privacy feature in iOS, iPadOS, and macOS, can inadvertently expose users’ real IP addresses under certain conditions. Private Relay is designed to route Safari traffic through two separate internet relays, masking location and IP. However, testing reveals that services using WebRTC, IPv6, or custom DNS settings may bypass the encrypted tunnel, undermining the feature’s privacy guarantees for iPhone and Mac users.
Private Relay works by encrypting DNS and HTTP(S) requests, then sending them first to Apple and onward through a third-party partner. Yet WebRTC-based applications—commonly used for real-time voice and video—establish direct peer-to-peer connections that fall outside Private Relay’s scope. When a website or web app leverages WebRTC APIs, the client’s local and public IP addresses can still be retrieved, exposing real location and network information.
Tests have also shown that devices on dual-stack IPv4/IPv6 networks can leak addresses if a website initiates an IPv6-only lookup. In these scenarios, the request bypasses Private Relay’s IPv4 tunnel and connects directly via IPv6. Custom DNS configurations, such as third-party or enterprise DNS resolvers, may similarly divert traffic outside the relay’s encrypted channel, allowing DNS queries to reveal the user’s network.
For Apple users, these findings underscore the importance of understanding Private Relay’s limitations. The feature does not apply to all internet traffic—third-party apps, email protocols, and non-Safari browsers remain outside its protection. Mac and iPhone users who rely on Private Relay for location privacy should audit browser-based services that use WebRTC or enforce DNS via Settings > Wi-Fi > Network > Configure DNS.
Apple’s documentation notes that certain enterprise and education networks using specific DNS or proxy configurations are incompatible with Private Relay. In such environments, the feature must be disabled to maintain network access. While Apple has not publicly addressed these leak scenarios, users can mitigate risk by disabling WebRTC in browser settings via Safari’s Develop menu or by using browser extensions that block WebRTC traffic.
Looking ahead, Apple may enhance Private Relay in future iOS and macOS updates to handle IPv6 uniformly and intercept WebRTC-specific calls within Safari. Broader support across system-wide network stacks or integration with Apple Intelligence could extend relay protections beyond just web browsing. Until then, users concerned about privacy should combine Private Relay with a reputable VPN for comprehensive IP masking.
Ultimately, Private Relay remains a valuable privacy layer for everyday browsing on iPhone, iPad, and Mac. However, its current design leaves gaps for advanced web features and network configurations. Understanding these boundaries will help users maintain better control over their IP exposure while Apple refines its approach to encrypted, privacy-first internet access across its ecosystem.
FAQs
Can Private Relay protect all traffic on my iPhone?
No. iCloud Private Relay only covers Safari browsing and certain DNS queries. Apps, third-party browsers, and WebRTC-based services can bypass the relay.
How do WebRTC leaks occur despite Private Relay?
WebRTC establishes peer-to-peer connections outside HTTP(S) tunnels. It retrieves local and public IPs directly through STUN servers, which are not routed via Private Relay.
What should I do to prevent IPv6 address leaks?
To avoid leaks, ensure your network uses IPv4-only routing or use a VPN that manages both IPv4 and IPv6 traffic uniformly across apps and system services.
Will Apple fix these leaks in upcoming updates?
Apple has not announced specific fixes. Future iOS and macOS updates may expand Private Relay to handle IPv6 and WebRTC scenarios more comprehensively within Safari.
Verdict
iCloud Private Relay offers improved browsing privacy for Safari users on iPhone and Mac but currently doesn’t shield WebRTC, IPv6 queries, or traffic from custom DNS settings. While valuable for everyday use, these technical gaps allow real IP exposure in specialized scenarios. Apple device users seeking full IP anonymity should pair Private Relay with a robust VPN and manage browser settings to block WebRTC. As Apple evolves Private Relay, understanding its limitations is key to maintaining online privacy.
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