Port 4091EminentWare Installer

Port 4091 is assigned to EminentWare Installer; no widely documented listener or deployment is known.

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

also known as ewinstaller

Technical Details

what runs on :4091

EminentWare Installer is registered on port :4091 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 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 :4091

this machine

# linux
sudo ss -tulpn 'sport = :4091'

# macos / bsd
sudo lsof -nP -i :4091

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :4091

another host

nmap -sV -p T:4091 <host>
sudo nmap -sU -sV -p U:4091 <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 :4091

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 :4091 yet

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

Record

iana registry entry

port: :4091
service: EminentWare Installer
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: IANA lists this port for EminentWare Installer, but records no registrant. Its current product context and where engineers would encounter it are not established.
lookups: 0rank 993
added: 2026-10-03
updated: 2026-10-03
references: IANA service name registry — port 4091

Something wrong?

This record is maintained by the engineers who use port 4091. 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 2026-10-03.

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 :4091, by lookups.

port	service	proto	category	risk	views
:4125	Remote Web Workplace	TCP	Web Services	caution	20.5k
:4096	Ascom Timeplex BRE	TCPUDP	Network Services	safe	16.5k
:4116	Smartcard TLS	TCPUDP	Security	caution	13.6k
:4100	WatchGuard Auth Applet		Security	caution	10.1k
:4069	Minger Email Verification	UDP	Email	caution	8.5k
:4093	PxPlus Client Server	TCPUDP	Databases	caution	8.0k
:4111	Xgrid	TCP	System	caution	7.4k
:4089	OpenCORE Remote Control	TCPUDP	Remote Access	caution	7.4k

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :4091EminentWare Installer

Technical Details

Security Information

Related Ports

Port 4091EminentWare Installer