CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 1940: JetVision Client Port

Port 1940 is assigned by IANA to jvclient (JetVision Client Port).

1940

How jvclient works

Other services
client:1940jvclientresponse client:1940jvclientresponse

The client sends a request to port 1940 and the jvclient 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 1940 dangerous?

We have no specific security note for port 1940. 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 1940

ServicePortTransportDescriptionReferenceUpdated
jvclient 1940 TCP, UDP JetVision Client Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1940, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1940'      # process listening on 1940
sudo lsof -nP -i :1940

macOS

sudo lsof -nP -i :1940

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1940 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1940
netstat -ano | findstr :1940

From another machine

nmap -p 1940 -sV <host>
sudo nmap -sU -p 1940 <host>
nc -zv <host> 1940

Block it in the firewall

sudo ufw deny 1940/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1940" -Direction Inbound -LocalPort 1940 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1940 used for?

Port 1940 is assigned by IANA to jvclient (JetVision Client Port).

Is port 1940 TCP or UDP?

Port 1940 is registered for TCP and UDP.

Is it safe to open port 1940?

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 1940 is open?

On Linux run "ss -ltnup 'sport = :1940'", on macOS "lsof -nP -i :1940", and on Windows "netstat -ano | findstr :1940" to see the local process. From another machine, "nmap -p 1940 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

Latest vulnerability news

All news