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// Other services

Port 1848: fjdocdist

Port 1848 is assigned by IANA to fjdocdist (fjdocdist).

1848

How fjdocdist works

Other services
client:1848fjdocdistresponse client:1848fjdocdistresponse

The client sends a request to port 1848 and the fjdocdist 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 1848 dangerous?

We have no specific security note for port 1848. 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 1848

ServicePortTransportDescriptionReferenceUpdated
fjdocdist 1848 TCP, UDP fjdocdist - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1848, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1848'      # process listening on 1848
sudo lsof -nP -i :1848

macOS

sudo lsof -nP -i :1848

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1848 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1848
netstat -ano | findstr :1848

From another machine

nmap -p 1848 -sV <host>
sudo nmap -sU -p 1848 <host>
nc -zv <host> 1848

Block it in the firewall

sudo ufw deny 1848/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1848" -Direction Inbound -LocalPort 1848 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1848 used for?

Port 1848 is assigned by IANA to fjdocdist (fjdocdist).

Is port 1848 TCP or UDP?

Port 1848 is registered for TCP and UDP.

Is it safe to open port 1848?

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 1848 is open?

On Linux run "ss -ltnup 'sport = :1848'", on macOS "lsof -nP -i :1848", and on Windows "netstat -ano | findstr :1848" to see the local process. From another machine, "nmap -p 1848 <host>" shows whether it is reachable.

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