Port 5028 (qvr)

IANA assigns port 5028 to qvr: Quiqum Virtual Relais.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

qvr TCP Quiqum Virtual Relais Philipp Marcel Albrecht -

Registry dates for this port: registered 2009-07-06.

Linux: is anything listening on TCP 5028?

sudo ss -tlnp 'sport = :5028'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5028

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':5028 '

Windows (Command Prompt)

netstat -ano | findstr :5028

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5028 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 5028

From Windows

Test-NetConnection HOST -Port 5028

ufw

sudo ufw deny 5028/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 5028 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 5028 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 5028' -Direction Inbound -Protocol TCP -LocalPort 5028 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.