Port 47000Mbus (Message Bus)

Mbus is a local multicast message bus for coordination among multimedia and conferencing applications.

transport: tcp · udp
in transit: cleartext
assignment: official
risk: 1/10
lookups: 0

also known as RFC 3259

Technical Details

what runs on :47000

The IANA assignment is for the RFC 3259 Message Bus, associated with Dirk Kutscher. Mbus is designed for local-network coordination: its usual transport is UDP multicast on port 47000, with text-oriented, parenthesized messages exchanged between participants; it is not a conventional request/response service with a TCP handshake. The registry lists both TCP and UDP, but the established Mbus use is UDP.

Security Information

exposure of :47000

risk score

1/ 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 2,023 ports — this one sits 1.6 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

Mbus is intended for a local coordination environment, not direct internet exposure. Traffic is not encrypted by default, and an attacker able to reach the bus may be able to observe or inject messages; keep it within a trusted network and apply network controls.

Record

iana registry entry

port: :47000
service: Mbus (Message Bus)
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: Network Services
usage: Mbus is an RFC 3259 protocol intended for local coordination between multimedia or conferencing application components. It is niche and rarely encountered in general network scans; an open port 47000 is not necessarily an Mbus listener.
lookups: 0rank 993
added: 2026-10-21
updated: 2026-10-21
references: IANA service name registry — port 47000

Something wrong?

This record is maintained by the engineers who use port 47000. 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 2026-10-21.

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 :47000Mbus (Message Bus)

Technical Details

Security Information

Related Ports

Port 47000Mbus (Message Bus)