UDP 34962
Synopsis
- UDP port 34962 is used by PROFINET IO Real-Time (RT) traffic (IANA: profinet-rt) for cyclic I/O data between PLC “IO-Controllers” and field “IO-Devices.”
- Real-world examples include Siemens SIMATIC S7-1200/S7-1500 PLCs exchanging RT data with ET 200SP/ET 200S I/O over PROFINET.
- Drives such as Siemens SINAMICS G120/S120 and SEW‑Eurodrive MOVI‑C operate as PROFINET devices communicating with PLCs via UDP 34962.
- Industrial robots with PROFINET options (e.g., KUKA, ABB) and I/O systems like Phoenix Contact Axioline F or WAGO 750 series also use this port for PROFINET RT data.
- Many third‑party PROFINET‑capable devices (e.g., Pepperl+Fuchs sensors, Beckhoff PROFINET device terminals) participate in this traffic as well.
- Security note: ICS advisories have documented denial‑of‑service issues in some PROFINET stacks reachable over this port, so exposing UDP 34962 to untrusted networks has been associated with exploitation attempts.
Observed activity
Last 30 days
Detailed chart