Port 2203B2 Runtime Protocol

B2 Runtime Protocol traffic assigned to TCP and UDP port 2203; deployment and protocol details are not recorded.

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

Technical Details

what runs on :2203

B2 Runtime Protocol is registered on port :2203 over tcp and udp. 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 found open rarely. What's listening is often not the registered service, so check before you assume.

find what's listening on :2203

this machine

# linux
sudo ss -tulpn 'sport = :2203'

# macos / bsd
sudo lsof -nP -i :2203

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :2203

another host

nmap -sV -p T:2203 <host>
sudo nmap -sU -sV -p U:2203 <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 :2203

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 :2203 yet

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

Record

iana registry entry

port: :2203
service: B2 Runtime Protocol
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: Port 2203 is assigned to the B2 Runtime Protocol over both TCP and UDP. No registrant or deployment information is recorded, so there is no established usage profile for identifying this traffic.
lookups: 0rank 993
added: 2026-09-11
updated: 2026-09-11
references: IANA service name registry — port 2203

Something wrong?

This record is maintained by the engineers who use port 2203. 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 2026-09-11.

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 :2203, by lookups.

port	service	proto	category	risk	views
:2222	DirectAdmin & ESET Remote Admin	TCP	Web Services	caution	21.6k
:2210	MikroTik Dude Remote Management	TCP	Remote Access	caution	13.6k
:2211	MikroTik Dude Secure Management	TCP	Security	caution	12.9k
:2210	NOAAPORT Broadcast	TCPUDP	Network Services	caution	11.4k
:2181	EForward Document Transport	TCPUDP	File Transfer	caution	10.4k
:2161	APC Agent	TCP	Network Services	caution	10.0k
:2223	Office OS X Anti-Piracy Monitor	UDP	Security	caution	9.3k
:2212	LeeCO POS Server	TCPUDP	Network Services	caution	9.3k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :2203B2 Runtime Protocol

Technical Details

Security Information

Related Ports

Port 2203B2 Runtime Protocol