Port 4573 (cardifftec-back)

IANA assigns port 4573 to cardifftec-back: A port for communication between a server and client for a custom backup system.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

cardifftec-back TCP A port for communication between a server and client for a custom backup system CardiffTec -

Registry dates for this port: registered 2016-05-19.

Linux: is anything listening on TCP 4573?

sudo ss -tlnp 'sport = :4573'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4573

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4573 '

Windows (Command Prompt)

netstat -ano | findstr :4573

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4573 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 4573

From Windows

Test-NetConnection HOST -Port 4573

ufw

sudo ufw deny 4573/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4573 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4573 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4573' -Direction Inbound -Protocol TCP -LocalPort 4573 -Action Block

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