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Port 5083 (qfp)

IANA assigns port 5083 to qfp: Qpur File Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
qfp TCP Qpur File Protocol Joachim Kluemper -
qfp UDP Qpur File Protocol Joachim Kluemper -

Registry dates for this port: registered 2008-03-19.

Check what is listening on port 5083

Linux: is anything listening on TCP 5083?
sudo ss -tlnp 'sport = :5083'
Linux: UDP 5083
sudo ss -ulnp 'sport = :5083'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5083
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5083 '
Windows (Command Prompt)
netstat -ano | findstr :5083
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5083 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5083
From Windows
Test-NetConnection HOST -Port 5083
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5083

Block port 5083 in the firewall

ufw
sudo ufw deny 5083/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5083 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5083' -Direction Inbound -Protocol TCP -LocalPort 5083 -Action Block
ufw
sudo ufw deny 5083/udp
iptables
sudo iptables -A INPUT -p udp --dport 5083 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5083' -Direction Inbound -Protocol UDP -LocalPort 5083 -Action Block

Related ports

5081sdl-ets5082qcp5084llrp5085encrypted-llrp

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.