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// Other services

Port 2866: iwlistener

Port 2866 is assigned by IANA to iwlistener (iwlistener).

2866

How iwlistener works

Other services
client:2866iwlistenerresponse client:2866iwlistenerresponse

The client sends a request to port 2866 and the iwlistener 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 2866 dangerous?

We have no specific security note for port 2866. 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 2866

ServicePortTransportDescriptionReferenceUpdated
iwlistener 2866 TCP, UDP iwlistener - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2866, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2866'      # process listening on 2866
sudo lsof -nP -i :2866

macOS

sudo lsof -nP -i :2866

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2866 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2866
netstat -ano | findstr :2866

From another machine

nmap -p 2866 -sV <host>
sudo nmap -sU -p 2866 <host>
nc -zv <host> 2866

Block it in the firewall

sudo ufw deny 2866/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2866" -Direction Inbound -LocalPort 2866 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2866 used for?

Port 2866 is assigned by IANA to iwlistener (iwlistener).

Is port 2866 TCP or UDP?

Port 2866 is registered for TCP and UDP.

Is it safe to open port 2866?

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 2866 is open?

On Linux run "ss -ltnup 'sport = :2866'", on macOS "lsof -nP -i :2866", and on Windows "netstat -ano | findstr :2866" to see the local process. From another machine, "nmap -p 2866 <host>" shows whether it is reachable.

05 Related
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