Port 34963PROFINET RT Multicast

PROFINET real-time multicast traffic for industrial automation; ordinary PROFINET cyclic RT traffic often uses Ethernet directly instead.

inNetwork Services

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 2/10
lookups: 0

Technical Details

what runs on :34963

IANA assigns port 34963 to PROFINET RT Multicast over TCP and UDP. PROFINET RT supports cyclic, time-sensitive communication among automation devices; where this port is used for IP-based multicast, expect datagram traffic rather than a conventional request-and-response service. In common PROFINET IO deployments, cyclic RT data is carried directly in Ethernet frames using EtherType 0x8892, not as TCP or UDP traffic, so the port assignment alone does not imply a listener. PROFINET connection management is associated with port 34964, but that is a separate service.

Security Information

exposure of :34963

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 1,984 ports — this one sits 0.6 below.

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

This is an uncommon industrial-control assignment and is not normally expected to be reachable from the public internet. PROFINET RT traffic is not encrypted by default; if an implementation exposes IP-based RT multicast, restrict it to the intended OT network, since access to industrial control traffic can enable monitoring or disruption. The port's absence from internet-wide scan observations is consistent with limited public exposure.

Record

iana registry entry

port: :34963
service: PROFINET RT Multicast
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services
usage: The assignment is for PROFINET real-time multicast, part of the PROFINET industrial automation standard maintained by PROFIBUS & PROFINET International. Engineers are more likely to encounter cyclic PROFINET RT frames on an industrial Ethernet segment than a public-facing listener on this port; internet-wide scans have not observed it open.
lookups: 0rank 993
added: 2026-10-20
updated: 2026-10-20
references: IANA service name registry — port 34963

Something wrong?

This record is maintained by the engineers who use port 34963. 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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risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :34963PROFINET RT Multicast

Technical Details

Security Information

Related Ports

Port 34963PROFINET RT Multicast