CyberHunter
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// Other services

Port 3782: Secure ISO TP0 port

Port 3782 is assigned by IANA to iso-tp0s (Secure ISO TP0 port).

3782

How iso-tp0s works

Other services
client:3782iso-tp0sresponse client:3782iso-tp0sresponse

The client sends a request to port 3782 and the iso-tp0s 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 3782 dangerous?

We have no specific security note for port 3782. 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 3782

ServicePortTransportDescriptionReferenceUpdated
iso-tp0s 3782 TCP, UDP Secure ISO TP0 port - 2003-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 3782, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3782'      # process listening on 3782
sudo lsof -nP -i :3782

macOS

sudo lsof -nP -i :3782

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3782 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3782
netstat -ano | findstr :3782

From another machine

nmap -p 3782 -sV <host>
sudo nmap -sU -p 3782 <host>
nc -zv <host> 3782

Block it in the firewall

sudo ufw deny 3782/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3782" -Direction Inbound -LocalPort 3782 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3782 used for?

Port 3782 is assigned by IANA to iso-tp0s (Secure ISO TP0 port).

Is port 3782 TCP or UDP?

Port 3782 is registered for TCP and UDP.

Is it safe to open port 3782?

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 3782 is open?

On Linux run "ss -ltnup 'sport = :3782'", on macOS "lsof -nP -i :3782", and on Windows "netstat -ano | findstr :3782" to see the local process. From another machine, "nmap -p 3782 <host>" shows whether it is reachable.

05 Related
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