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// Other services

Port 2166: iwserver

Port 2166 is assigned by IANA to iwserver (iwserver).

2166

How iwserver works

Other services
client:2166iwserverresponse client:2166iwserverresponse

The client sends a request to port 2166 and the iwserver service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 2166 dangerous?

We have no specific security note for port 2166. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 2166

ServicePortTransportDescriptionReferenceUpdated
iwserver 2166 TCP, UDP iwserver - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2166, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2166'      # process listening on 2166
sudo lsof -nP -i :2166

macOS

sudo lsof -nP -i :2166

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2166 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2166
netstat -ano | findstr :2166

From another machine

nmap -p 2166 -sV <host>
sudo nmap -sU -p 2166 <host>
nc -zv <host> 2166

Block it in the firewall

sudo ufw deny 2166/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2166" -Direction Inbound -LocalPort 2166 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2166 used for?

Port 2166 is assigned by IANA to iwserver (iwserver).

Is port 2166 TCP or UDP?

Port 2166 is registered for TCP and UDP.

Is it safe to open port 2166?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 2166 is open?

On Linux run "ss -ltnup 'sport = :2166'", on macOS "lsof -nP -i :2166", and on Windows "netstat -ano | findstr :2166" to see the local process. From another machine, "nmap -p 2166 <host>" shows whether it is reachable.

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