Port 2166iwserver

An obscure IANA-assigned iwserver service registered to Fred Surr on TCP and UDP port 2166.

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

Technical Details

what runs on :2166

iwserver is registered on port :2166 over tcp and udp to Fred Surr. 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 :2166

this machine

# linux
sudo ss -tulpn 'sport = :2166'

# macos / bsd
sudo lsof -nP -i :2166

# windows (then: tasklist /FI "PID eq <pid>")
netstat -ano | findstr :2166

another host

nmap -sV -p T:2166 <host>
sudo nmap -sU -sV -p U:2166 <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 :2166

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 :2166 yet

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

Record

iana registry entry

port: :2166
service: iwserver
transport: TCPUDP
encryption: cleartext
assignment: iana registered
risk: 1/10safe
category: uncategorised
usage: The IANA registry assigns TCP and UDP port 2166 to the service name iwserver. It is registered to Fred Surr, but no public deployment or product context is recorded here.
lookups: 0rank 993
added: 2026-09-20
updated: 2026-09-20
references: IANA service name registry — port 2166

Something wrong?

This record is maintained by the engineers who use port 2166. 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 2026-09-20.

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 :2166, by lookups.

port	service	proto	category	risk	views
:2105	eklogin Kerberos Remote Login	TCPUDP	Security	safe	22.1k
:2222	DirectAdmin & ESET Remote Admin	TCP	Web Services	caution	21.6k
:2105	Zephyr Notification Service (hm-serv)	TCPUDP	Network Services	caution	19.0k
:2103	Zephyr Notification Service	TCPUDP	Network Services	caution	15.8k
:2105	IBM MiniPay	TCPUDP	System	caution	15.7k
: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

risk mix of the 8 listed

safe13%
caution88%

0 of 8 encrypted

Port :2166iwserver

Technical Details

Security Information

Related Ports

Port 2166iwserver