CyberHunter
Local dataset, no network
// Other services

Port 1938: JetVWay Client Port

Port 1938 is assigned by IANA to jwclient (JetVWay Client Port).

1938

How jwclient works

Other services
client:1938jwclientresponse client:1938jwclientresponse

The client sends a request to port 1938 and the jwclient 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 1938 dangerous?

We have no specific security note for port 1938. 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 1938

ServicePortTransportDescriptionReferenceUpdated
jwclient 1938 TCP, UDP JetVWay Client Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1938, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1938'      # process listening on 1938
sudo lsof -nP -i :1938

macOS

sudo lsof -nP -i :1938

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1938 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1938
netstat -ano | findstr :1938

From another machine

nmap -p 1938 -sV <host>
sudo nmap -sU -p 1938 <host>
nc -zv <host> 1938

Block it in the firewall

sudo ufw deny 1938/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1938" -Direction Inbound -LocalPort 1938 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1938 used for?

Port 1938 is assigned by IANA to jwclient (JetVWay Client Port).

Is port 1938 TCP or UDP?

Port 1938 is registered for TCP and UDP.

Is it safe to open port 1938?

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 1938 is open?

On Linux run "ss -ltnup 'sport = :1938'", on macOS "lsof -nP -i :1938", and on Windows "netstat -ano | findstr :1938" to see the local process. From another machine, "nmap -p 1938 <host>" shows whether it is reachable.

05 Related
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