Port 34966PROFINET Secure Real-Time

UDP port for secure PROFINET real-time data transfer between industrial automation devices, using unicast or multicast.

transport: udp
in transit: encrypted
assignment: official
risk: 2/10
lookups: 0

also known as profinet-rt-sec, PROFINET secure RT

Technical Details

what runs on :34966

The assignment describes PROFINET secure real-time data transfer over UDP, supporting both unicast and multicast. It is distinct from traditional PROFINET real-time traffic carried directly over Ethernet. The registry does not specify packet framing, handshake, cryptographic mechanism, or deployment defaults, so those details should be confirmed against the applicable PROFINET specification and device documentation rather than inferred from the port number.

Security Information

exposure of :34966

risk score

2/ 10safe

routine exposure. this port is rarely the way in on its own — keep it patched and logged and move on.

network services averages 2.6 across 1,986 ports — this one sits 0.6 below.

in transit

encrypted

payloads are protected on the wire

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

This service is intended for industrial control communications and should normally remain on a controlled OT network, not be exposed directly to the internet. The assignment identifies it as secure, but does not establish which protections are mandatory or how peers authenticate; verify the implementation's security settings and restrict access to trusted controllers and devices. No unauthorized-use report or internet-wide open observation is supplied here.

Record

iana registry entry

port: :34966
service: PROFINET Secure Real-Time
transport: UDP
encryption: tls / encrypted
assignment: iana registered
risk: 2/10safe
category: Network Services IoT
usage: This is the IANA-assigned UDP service for secure real-time data transfer in PROFINET, an industrial automation communication system maintained by PNO. Engineers would encounter it on PROFINET controllers and devices that implement this secure UDP mode; it has not been observed open in the cited internet-wide scan data.
lookups: 0rank 993
added: 2026-10-20
updated: 2026-10-20
references: IANA service name registry — port 34966

Something wrong?

This record is maintained by the engineers who use port 34966. Every field on it is editable — change what's wrong, say how you know, and a reviewer publishes it, usually within a minute. Last touched 2026-10-20.

01edit any field on a page of its own
02a model checks it for accuracy and spam
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edit this record →back to the registry

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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :34966PROFINET Secure Real-Time

Technical Details

Security Information

Related Ports

Port 34966PROFINET Secure Real-Time