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// Other services

Port 13783: VOPIED Protocol

Port 13783 is assigned by IANA to vopied (VOPIED Protocol).

13783

How vopied works

Other services
client:13783vopiedresponse client:13783vopiedresponse

The client sends a request to port 13783 and the vopied 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 13783 dangerous?

We have no specific security note for port 13783. 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 13783

ServicePortTransportDescriptionReferenceUpdated
vopied 13783 TCP, UDP VOPIED Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 13783, and is it reachable?

Linux

sudo ss -ltnup 'sport = :13783'      # process listening on 13783
sudo lsof -nP -i :13783

macOS

sudo lsof -nP -i :13783

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 13783 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 13783
netstat -ano | findstr :13783

From another machine

nmap -p 13783 -sV <host>
sudo nmap -sU -p 13783 <host>
nc -zv <host> 13783

Block it in the firewall

sudo ufw deny 13783/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 13783" -Direction Inbound -LocalPort 13783 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 13783 used for?

Port 13783 is assigned by IANA to vopied (VOPIED Protocol).

Is port 13783 TCP or UDP?

Port 13783 is registered for TCP and UDP.

Is it safe to open port 13783?

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 13783 is open?

On Linux run "ss -ltnup 'sport = :13783'", on macOS "lsof -nP -i :13783", and on Windows "netstat -ano | findstr :13783" to see the local process. From another machine, "nmap -p 13783 <host>" shows whether it is reachable.

05 Related
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