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// Other services

Port 5083: Qpur File Protocol

Port 5083 is assigned by IANA to qfp (Qpur File Protocol).

5083

How qfp works

Other services
client:5083qfpresponse client:5083qfpresponse

The client sends a request to port 5083 and the qfp 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 5083 dangerous?

We have no specific security note for port 5083. 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 5083

ServicePortTransportDescriptionReferenceUpdated
qfp 5083 TCP, UDP Qpur File Protocol - 2008-03-19

// source: IANA service name and port number registry

03 Check it

Which program uses port 5083, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5083'      # process listening on 5083
sudo lsof -nP -i :5083

macOS

sudo lsof -nP -i :5083

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5083 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5083
netstat -ano | findstr :5083

From another machine

nmap -p 5083 -sV <host>
sudo nmap -sU -p 5083 <host>
nc -zv <host> 5083

Block it in the firewall

sudo ufw deny 5083/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5083" -Direction Inbound -LocalPort 5083 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5083 used for?

Port 5083 is assigned by IANA to qfp (Qpur File Protocol).

Is port 5083 TCP or UDP?

Port 5083 is registered for TCP and UDP.

Is it safe to open port 5083?

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 5083 is open?

On Linux run "ss -ltnup 'sport = :5083'", on macOS "lsof -nP -i :5083", and on Windows "netstat -ano | findstr :5083" to see the local process. From another machine, "nmap -p 5083 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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