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// Other services

Port 2216: VTU data service

Port 2216 is assigned by IANA to vtu-comms (VTU data service).

2216

How vtu-comms works

Other services
client:2216vtu-commsresponse client:2216vtu-commsresponse

The client sends a request to port 2216 and the vtu-comms 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 2216 dangerous?

We have no specific security note for port 2216. 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 2216

ServicePortTransportDescriptionReferenceUpdated
vtu-comms 2216 TCP, UDP VTU data service - 2006-01

// source: IANA service name and port number registry

03 Check it

Which program uses port 2216, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2216'      # process listening on 2216
sudo lsof -nP -i :2216

macOS

sudo lsof -nP -i :2216

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2216 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2216
netstat -ano | findstr :2216

From another machine

nmap -p 2216 -sV <host>
sudo nmap -sU -p 2216 <host>
nc -zv <host> 2216

Block it in the firewall

sudo ufw deny 2216/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2216" -Direction Inbound -LocalPort 2216 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2216 used for?

Port 2216 is assigned by IANA to vtu-comms (VTU data service).

Is port 2216 TCP or UDP?

Port 2216 is registered for TCP and UDP.

Is it safe to open port 2216?

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 2216 is open?

On Linux run "ss -ltnup 'sport = :2216'", on macOS "lsof -nP -i :2216", and on Windows "netstat -ano | findstr :2216" to see the local process. From another machine, "nmap -p 2216 <host>" shows whether it is reachable.

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