Port 34964PROFINET Context Manager

PROFINET IO devices use this port for RPC-based connection management and other acyclic controller-device services.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 8/10
lookups: 0

also known as profinet-cm

Technical Details

what runs on :34964

IANA assigns port 34964 to the PROFINET Context Manager over both TCP and UDP. PROFINET deployments commonly carry its acyclic services as DCE/RPC-style request/reply traffic over UDP; this is not an HTTP service, and the port is distinct from the Ethernet-layer traffic used for cyclic PROFINET RT data. The Context Manager handles communication relationships between IO controllers and devices. TCP is also in the registry assignment, but UDP is the common PROFINET usage.

Security Information

exposure of :34964

risk score

8/ 10risk

treat as sensitive. widely scanned and regularly exploited when reachable — restrict it to known sources.

network services averages 2.6 across 1,984 ports — this one sits 5.4 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

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

reachable over

tcp · udp

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

security overview

PROFINET traffic is not encrypted by default, and the Context Manager is part of industrial control communications. Keep it on trusted, segmented OT networks and restrict it to the controllers and devices that need it; internet exposure is inappropriate because reachable control services can enable disruptive interaction with industrial equipment.

Record

iana registry entry

port: :34964
service: PROFINET Context Manager
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 8/10risk
category: Network Services IoT
usage: This is the PROFINET Context Manager service used between PROFINET IO controllers and devices, especially while establishing and managing IO relationships and performing acyclic operations. Engineers typically encounter it on a plant network during device startup, configuration, or diagnostics; cyclic real-time IO data generally uses Ethernet frames rather than this port.
lookups: 0rank 993
added: 2026-10-20
updated: 2026-10-20
references: IANA service name registry — port 34964

Something wrong?

This record is maintained by the engineers who use port 34964. 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.

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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 :34964PROFINET Context Manager

Technical Details

Security Information

Related Ports

Port 34964PROFINET Context Manager