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

Port 1939: JetVision Server Port

Port 1939 is assigned by IANA to jvserver (JetVision Server Port).

1939

How jvserver works

Other services
client:1939jvserverresponse client:1939jvserverresponse

The client sends a request to port 1939 and the jvserver 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 1939 dangerous?

We have no specific security note for port 1939. 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 1939

ServicePortTransportDescriptionReferenceUpdated
jvserver 1939 TCP, UDP JetVision Server Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1939, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1939'      # process listening on 1939
sudo lsof -nP -i :1939

macOS

sudo lsof -nP -i :1939

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1939 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1939
netstat -ano | findstr :1939

From another machine

nmap -p 1939 -sV <host>
sudo nmap -sU -p 1939 <host>
nc -zv <host> 1939

Block it in the firewall

sudo ufw deny 1939/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1939" -Direction Inbound -LocalPort 1939 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1939 used for?

Port 1939 is assigned by IANA to jvserver (JetVision Server Port).

Is port 1939 TCP or UDP?

Port 1939 is registered for TCP and UDP.

Is it safe to open port 1939?

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 1939 is open?

On Linux run "ss -ltnup 'sport = :1939'", on macOS "lsof -nP -i :1939", and on Windows "netstat -ano | findstr :1939" to see the local process. From another machine, "nmap -p 1939 <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