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UDP 3671

ProtocolUDP
Port3671
LabelsKNXnet/IP(EIBnet/IP)

Synopsis

  • UDP port 3671 is the default port for KNXnet/IP (formerly EIBnet/IP), the KNX building automation protocol, used for tunneling and routing.
  • KNX Association’s ETS (ETS5/ETS6) uses UDP 3671 to connect to KNX IP interfaces/routers.
  • Home Assistant’s KNX integration and openHAB’s KNX binding communicate with KNX/IP gateways over UDP 3671.
  • The knxd/eibd daemons and ioBroker’s KNX adapter use UDP 3671 to interface with KNX IP routers.
  • Commercial KNX IP routers/interfaces from Siemens, Gira, ABB, Jung, and Weinzierl listen on UDP 3671 for KNXnet/IP.
  • Examples include Gira HomeServer, Siemens N146 KNX IP Router, and Weinzierl KNX IP Interface (e.g., 730/750) operating on this port.
  • Security: Exposed KNXnet/IP devices on UDP 3671 have been abused to remotely control building automation; deploying KNXnet/IP Secure (authentication/encryption) and not exposing the port to the internet mitigates this.

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