Port 4991VITA Radio Transport

VITA Radio Transport carries radio data over TCP or UDP on port 4991.

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

also known as vrt

Technical Details

what runs on :4991

no technical write-up for :4991 yet

the handshake, the implementations you meet in the wild, the flags that matter. we have the registry entry — the detail comes from the engineers who run it.

add technical details

Security Information

exposure of :4991

risk score

1/ 10safe

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

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

no security notes recorded for :4991 yet

known exploits, hardening advice, what a compromise looks like — suggest an edit if you know its exposure.

Record

iana registry entry

port: :4991
service: VITA Radio Transport
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: Port 4991 is assigned for VITA Radio Transport over TCP and UDP. The assignment was registered to Sam Bretheim on 2009-01-08; public deployment details are limited.
lookups: 0rank 994
added: 2026-09-06
updated: 2026-09-06
references: IANA service name registry — port 4991

Something wrong?

This record is maintained by the engineers who use port 4991. 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 2026-09-06.

01edit any field on a page of its own
02a model checks it for accuracy and spam
03clean and confident goes live immediately

edit this record →back to the registry

Related Ports

browse categories →

ports registered around :4991, by lookups.

port	service	proto	category	risk	views
:5001	Iperf	TCPUDP	Network Services	caution	27.7k
:5001	Commplex-Link	TCP	Network Services	caution	24.9k
:5001	Slingbox	TCP	Streaming	caution	22.4k
:5000	Commplex Main	TCP	Web Services	caution	15.4k
:5004	RTP Media Data	TCP	Streaming	safe	13.0k
:5000	UPnP Device Interop	TCP	Network Services	caution	12.7k
:5031	AVM CAPI-over-TCP	TCPUDP	Network Services	caution	12.0k
:4993	Home FTP Server Web UI	TCPUDP	Web Services	caution	11.1k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :4991VITA Radio Transport

Technical Details

Security Information

Related Ports

Port 4991VITA Radio Transport