Port 3457VAT control

Control traffic for Van Jacobson's Visual Audio Tool (VAT) conferencing system.

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

also known as VAT, Visual Audio Tool

Technical Details

what runs on :3457

VAT control traffic is assigned on both TCP and UDP port 3457. It is associated with the VAT audio-conferencing protocol and its separate media traffic, commonly identified with UDP port 3456; implementations exchange session and conference-control messages rather than carrying the primary audio stream on this port. VAT predates modern encrypted conferencing protocols and has no expectation of encryption by default.

Security Information

exposure of :3457

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 3.8 across 637 ports — this one sits 1.8 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

VAT control traffic should not normally be exposed to the public internet. Legacy, unauthenticated cleartext control messages may allow traffic observation or interference with sessions, although the service is sufficiently obsolete and uncommon that broad internet exposure is more likely to indicate misconfiguration or a forgotten deployment than an actively targeted service.

Record

iana registry entry

port: :3457
service: VAT control
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 2/10safe
category: Network Services Media
usage: This port carries default control traffic for VAT, Van Jacobson's legacy Visual Audio Tool used for network audio conferencing, including early MBone deployments. It is a historical service and is rarely encountered on contemporary networks.
lookups: 0rank 994
added: 2026-08-21
updated: 2026-08-21
references: IANA service name registry — port 3457

Something wrong?

This record is maintained by the engineers who use port 3457. 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 2026-08-21.

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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 :3457VAT control

Technical Details

Security Information

Related Ports

Port 3457VAT control