Port 5566Westec Connect

TCP port 5566 is assigned to the Westec Connect service.

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

Technical Details

what runs on :5566

Westec Connect is registered on port :5566 over tcp to Jon Bolen, assigned March 2009. 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 :5566

this machine

# linux
sudo ss -tlpn 'sport = :5566'

# macos / bsd
sudo lsof -nP -i :5566

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :5566

another host

nmap -sV -p T:5566 <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 :5566

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

every listening transport is another surface to filter at the edge

security overview

no security notes recorded for :5566 yet

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

Record

iana registry entry

port: :5566
service: Westec Connect
transport: TCP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: This assignment identifies TCP port 5566 for Westec Connect. The service was registered by Jon Bolen in 2009; public protocol and deployment details are not available from the registry entry.
lookups: 0rank 993
added: 2026-08-26
updated: 2026-08-26
references: IANA service name registry — port 5566

Something wrong?

This record is maintained by the engineers who use port 5566. 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 2026-08-26.

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 :5566, by lookups.

port	service	proto	category	risk	views
:5555	Freeciv	TCP	Security	caution	26.9k
:5550	HP Data Protector	TCP	File Transfer	caution	8.2k
:5517	Setiqueue Proxy	TCPtls	Cloud	caution	8.0k
:5591	Tidal Scheduler Master	TCP	System	caution	6.9k
:5556	Freeciv	TCPUDP	Gaming	caution	6.1k
:5630	PreciseCommunication	TCPUDP	—	safe	0
:5502	fcp-srvr-inst1	TCPUDP	—	safe	0
:5553	SGI Eventmond	TCPUDP	System	safe	0

risk mix of the 8 listed

safe38%
caution63%

1 of 8 encrypted

Port :5566Westec Connect

Technical Details

Security Information

Related Ports

Port 5566Westec Connect