Port 10443 (cirrossp)

IANA assigns port 10443 to cirrossp: CirrosSP Workstation Communication.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

cirrossp TCP CirrosSP Workstation Communication Cirros Document Solutions Ltd -

Registry dates for this port: registered 2020-02-12.

Linux: is anything listening on TCP 10443?

sudo ss -tlnp 'sport = :10443'

Linux / macOS: which process owns the port

sudo lsof -nP -i :10443

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':10443 '

Windows (Command Prompt)

netstat -ano | findstr :10443

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 10443 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 10443

From Windows

Test-NetConnection HOST -Port 10443

ufw

sudo ufw deny 10443/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 10443 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 10443 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 10443' -Direction Inbound -Protocol TCP -LocalPort 10443 -Action Block

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