Port 4378Cambridge Pixel SPx Display

Port 4378 is assigned to Cambridge Pixel SPx Display traffic over TCP and UDP.

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

also known as cp-spxdpy

Technical Details

what runs on :4378

Cambridge Pixel SPx Display is registered on port :4378 over tcp and udp to Richard Warren, assigned July 2007. 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 :4378

this machine

# linux
sudo ss -tulpn 'sport = :4378'

# macos / bsd
sudo lsof -nP -i :4378

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4378

another host

nmap -sV -p T:4378 <host>
sudo nmap -sU -sV -p U:4378 <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 :4378

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 :4378 yet

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

Record

iana registry entry

port: :4378
service: Cambridge Pixel SPx Display
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: TCP and UDP port 4378 is assigned to the Cambridge Pixel SPx Display service. The assignment is registered to Richard Warren; public deployment details are not established here.
lookups: 0rank 993
added: 2026-08-25
updated: 2026-08-25
references: IANA service name registry — port 4378

Something wrong?

This record is maintained by the engineers who use port 4378. 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 2026-08-25.

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 :4378, by lookups.

port	service	proto	category	risk	views
:4433	Axence nVision	TCP	Security	caution	8.9k
:4323	ArcLink/XT	UDP	Network Services	caution	8.8k
:4321	Referral Whois (RWhois)	TCP	Network Services	caution	5.7k
:4343	Wrapper: Offline	TCPUDP	Gaming	caution	1.7k
:4343	UNICALL	TCPUDP	—	safe	0
:4328	Jaxer Manager	TCPUDP	System	safe	0
:4404	Asigra DS-System Monitoring/Management	TCPUDP	System	safe	0
:4361	NavCom Discovery and Control	UDP	Network Services	safe	0

risk mix of the 8 listed

safe50%
caution50%

0 of 8 encrypted

Port :4378Cambridge Pixel SPx Display

Technical Details

Security Information

Related Ports

Port 4378Cambridge Pixel SPx Display