Port 3665Enterprise Engine

Enterprise Engine service traffic assigned to TCP and UDP port 3665.

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

also known as ent-engine

Technical Details

what runs on :3665

Enterprise Engine is registered on port :3665 over tcp and udp to Mike Delgrosso, assigned January 2003. 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 :3665

this machine

# linux
sudo ss -tulpn 'sport = :3665'

# macos / bsd
sudo lsof -nP -i :3665

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :3665

another host

nmap -sV -p T:3665 <host>
sudo nmap -sU -sV -p U:3665 <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 :3665

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 :3665 yet

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

Record

iana registry entry

port: :3665
service: Enterprise Engine
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: Port 3665 is assigned to the Enterprise Engine service, identified by IANA as an enterprise engine port. The assignment is registered to Mike Delgrosso; public implementation and deployment details are not established here.
lookups: 0rank 993
added: 2026-09-05
updated: 2026-09-05
references: IANA service name registry — port 3665

Something wrong?

This record is maintained by the engineers who use port 3665. 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 2026-09-05.

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 :3665, by lookups.

port	service	proto	category	risk	views
:3702	WS-Discovery	TCPUDP	Network Services	caution	16.5k
:3724	Club Penguin	TCP	Gaming	caution	10.4k
:3724	World of Warcraft	TCPUDP	Network Services	caution	10.2k
:3723	Battle.net Gaming	TCPUDP	Network Services	caution	9.2k
:3689	DAAP (iTunes Music Sharing)	TCP	Streaming	caution	9.2k
:3605	ComCam IO	UDP	Security	caution	7.8k
:3606	Splitlock Server	TCPUDP	Security	caution	6.5k
:3632	DistCC Distributed Compiler	TCP	Network Services	caution	6.1k

risk mix of the 8 listed

caution100%

0 of 8 encrypted

Port :3665Enterprise Engine

Technical Details

Security Information

Related Ports

Port 3665Enterprise Engine