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// Other services

Port 1717: fj-hdnet

Port 1717 is assigned by IANA to fj-hdnet (fj-hdnet).

1717

How fj-hdnet works

Other services
client:1717fj-hdnetresponse client:1717fj-hdnetresponse

The client sends a request to port 1717 and the fj-hdnet 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 1717 dangerous?

We have no specific security note for port 1717. 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 1717

ServicePortTransportDescriptionReferenceUpdated
fj-hdnet 1717 TCP, UDP fj-hdnet - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1717, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1717'      # process listening on 1717
sudo lsof -nP -i :1717

macOS

sudo lsof -nP -i :1717

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1717 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1717
netstat -ano | findstr :1717

From another machine

nmap -p 1717 -sV <host>
sudo nmap -sU -p 1717 <host>
nc -zv <host> 1717

Block it in the firewall

sudo ufw deny 1717/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1717" -Direction Inbound -LocalPort 1717 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1717 used for?

Port 1717 is assigned by IANA to fj-hdnet (fj-hdnet).

Is port 1717 TCP or UDP?

Port 1717 is registered for TCP and UDP.

Is it safe to open port 1717?

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 1717 is open?

On Linux run "ss -ltnup 'sport = :1717'", on macOS "lsof -nP -i :1717", and on Windows "netstat -ano | findstr :1717" to see the local process. From another machine, "nmap -p 1717 <host>" shows whether it is reachable.

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