Port 1833UDP Radio

UDP Radio service assigned to TCP and UDP port 1833.

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

Technical Details

what runs on :1833

UDP Radio is registered on port :1833 over tcp and udp to Guus Sliepen. We don't have a technical write-up for it beyond the IANA registry entry.

In nmap's internet-wide scan data this port is never observed open, so if it's open on your network it's more likely a custom or misconfigured service than the registered one.

find what's listening on :1833

this machine

# linux
sudo ss -tulpn 'sport = :1833'

# macos / bsd
sudo lsof -nP -i :1833

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :1833

another host

nmap -sV -p T:1833 <host>
sudo nmap -sU -sV -p U:1833 <host>

run it? the handshake, the implementations you meet in the wild and the flags that matter come from the engineers who do.

add technical details

Security Information

exposure of :1833

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 :1833 yet

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

Record

iana registry entry

port: :1833
service: UDP Radio
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: UDP Radio is the service name assigned to TCP and UDP port 1833. The assignment is registered to Guus Sliepen, with no registration date or additional notes recorded.
lookups: 0rank 993
added: 2026-09-19
updated: 2026-09-19
references: IANA service name registry — port 1833

Something wrong?

This record is maintained by the engineers who use port 1833. 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 2026-09-19.

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 :1833, by lookups.

port	service	proto	category	risk	views
:1863	Microsoft Notification Protocol	TCP	Voice and Chat	caution	15.9k
:1883	MQTT Broker	TCP	Network Services	caution	14.2k
:1812	RADIUS Auth Protocol	TCPUDP	Security	caution	12.0k
:1886	Leonardo over IP	TCP	File Transfer	caution	10.4k
:1801	MSMQ	TCPUDP	Network Services	caution	8.9k
:1813	RADIUS Accounting	TCPUDP	Security	caution	7.2k
:1773	KMSControl	TCPUDP	—	safe	0
:1840	Netopia VO2	TCPUDP	—	safe	0

risk mix of the 8 listed

safe25%
caution75%

0 of 8 encrypted

Port :1833UDP Radio

Technical Details

Security Information

Related Ports

Port 1833UDP Radio