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// Other services

Port 3141: VMODEM

Port 3141 is assigned by IANA to vmodem (VMODEM).

3141

How vmodem works

Other services
client:3141vmodemresponse client:3141vmodemresponse

The client sends a request to port 3141 and the vmodem 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 3141 dangerous?

We have no specific security note for port 3141. 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 3141

ServicePortTransportDescriptionReferenceUpdated
vmodem 3141 TCP, UDP VMODEM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3141, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3141'      # process listening on 3141
sudo lsof -nP -i :3141

macOS

sudo lsof -nP -i :3141

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3141 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3141
netstat -ano | findstr :3141

From another machine

nmap -p 3141 -sV <host>
sudo nmap -sU -p 3141 <host>
nc -zv <host> 3141

Block it in the firewall

sudo ufw deny 3141/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3141" -Direction Inbound -LocalPort 3141 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3141 used for?

Port 3141 is assigned by IANA to vmodem (VMODEM).

Is port 3141 TCP or UDP?

Port 3141 is registered for TCP and UDP.

Is it safe to open port 3141?

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 3141 is open?

On Linux run "ss -ltnup 'sport = :3141'", on macOS "lsof -nP -i :3141", and on Windows "netstat -ano | findstr :3141" to see the local process. From another machine, "nmap -p 3141 <host>" shows whether it is reachable.

05 Related
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