CyberHunter
Local dataset, no network
// Other services

Port 3878: FotoG CAD interface

Port 3878 is assigned by IANA to fotogcad (FotoG CAD interface).

3878

How fotogcad works

Other services
client:3878fotogcadresponse client:3878fotogcadresponse

The client sends a request to port 3878 and the fotogcad 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 3878 dangerous?

We have no specific security note for port 3878. 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 3878

ServicePortTransportDescriptionReferenceUpdated
fotogcad 3878 TCP, UDP FotoG CAD interface - 2003-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 3878, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3878'      # process listening on 3878
sudo lsof -nP -i :3878

macOS

sudo lsof -nP -i :3878

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3878 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3878
netstat -ano | findstr :3878

From another machine

nmap -p 3878 -sV <host>
sudo nmap -sU -p 3878 <host>
nc -zv <host> 3878

Block it in the firewall

sudo ufw deny 3878/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3878" -Direction Inbound -LocalPort 3878 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3878 used for?

Port 3878 is assigned by IANA to fotogcad (FotoG CAD interface).

Is port 3878 TCP or UDP?

Port 3878 is registered for TCP and UDP.

Is it safe to open port 3878?

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 3878 is open?

On Linux run "ss -ltnup 'sport = :3878'", on macOS "lsof -nP -i :3878", and on Windows "netstat -ano | findstr :3878" to see the local process. From another machine, "nmap -p 3878 <host>" shows whether it is reachable.

05 Related
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