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// Other services

Port 3916: WysDM Controller

Port 3916 is assigned by IANA to wysdmc (WysDM Controller).

3916

How wysdmc works

Other services
client:3916wysdmcresponse client:3916wysdmcresponse

The client sends a request to port 3916 and the wysdmc 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 3916 dangerous?

We have no specific security note for port 3916. 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 3916

ServicePortTransportDescriptionReferenceUpdated
wysdmc 3916 TCP, UDP WysDM Controller - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3916, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3916'      # process listening on 3916
sudo lsof -nP -i :3916

macOS

sudo lsof -nP -i :3916

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3916 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3916
netstat -ano | findstr :3916

From another machine

nmap -p 3916 -sV <host>
sudo nmap -sU -p 3916 <host>
nc -zv <host> 3916

Block it in the firewall

sudo ufw deny 3916/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3916" -Direction Inbound -LocalPort 3916 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3916 used for?

Port 3916 is assigned by IANA to wysdmc (WysDM Controller).

Is port 3916 TCP or UDP?

Port 3916 is registered for TCP and UDP.

Is it safe to open port 3916?

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 3916 is open?

On Linux run "ss -ltnup 'sport = :3916'", on macOS "lsof -nP -i :3916", and on Windows "netstat -ano | findstr :3916" to see the local process. From another machine, "nmap -p 3916 <host>" shows whether it is reachable.

05 Related
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