Google Cloud Messaging / Android
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TCP — Messaging
Port Overview
What is Port 5228?
Port 5228 is used by Google Cloud Messaging (GCM) and Firebase Cloud Messaging (FCM) for delivering push notifications to Android devices. Android devices maintain persistent TCP connections to Google servers on this port to receive app notifications. This port must be open on enterprise firewalls for Android push notification delivery.
Security Considerations
Port 5228 (Google Cloud Messaging / Android) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.
Recommendation: Standard security practices apply. Keep software updated and monitor access.