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: 3/10
lookups: 0

also known as vrt

Technical Details

what runs on :4991

VITA Radio Transport is a packetized radio-data protocol associated with the VITA-49 standard. It can use both TCP and UDP; VRT packets carry signal data, context information, or command/control information with typed headers, timestamps, stream identifiers, and optional fields. The protocol does not require a universal application-layer handshake, and implementations may select ports and transport behavior according to the equipment or software configuration; TCP/4991 and UDP/4991 are the IANA-registered endpoints.

Security Information

exposure of :4991

risk score

3/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

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

VRT does not inherently provide encryption or authentication, so radio samples and metadata can be exposed or spoofed when sent over an untrusted network. Internet exposure is generally unnecessary; restrict the port to trusted radio and processing hosts, and use network-layer controls or a secure tunnel where confidentiality or integrity matters.

Record

iana registry entry

port: :4991
service: VITA Radio Transport
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 3/10caution
category: uncategorised
usage: This port is used by VITA-49 (VRT) software-defined radio equipment and applications to exchange digitized radio samples, control information, and metadata. Engineers are most likely to encounter it between SDR receivers, transmitters, signal-processing systems, and test equipment.
lookups: 0rank 993
added: 2026-09-06
updated: 2026-09-22
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 2026-09-22.

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