Port 13223 (powwow-client)

IANA assigns port 13223 to powwow-client: PowWow Client.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

powwow-client TCP PowWow Client Paul K Peterson -

powwow-client UDP PowWow Client Paul K Peterson -

Linux: is anything listening on TCP 13223?

sudo ss -tlnp 'sport = :13223'

Linux: UDP 13223

sudo ss -ulnp 'sport = :13223'

Linux / macOS: which process owns the port

sudo lsof -nP -i :13223

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':13223 '

Windows (Command Prompt)

netstat -ano | findstr :13223

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 13223 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 13223

From Windows

Test-NetConnection HOST -Port 13223

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 13223

ufw

sudo ufw deny 13223/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 13223 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 13223 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 13223' -Direction Inbound -Protocol TCP -LocalPort 13223 -Action Block

ufw

sudo ufw deny 13223/udp

iptables

sudo iptables -A INPUT -p udp --dport 13223 -j DROP

nftables

sudo nft add rule inet filter input udp dport 13223 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 13223' -Direction Inbound -Protocol UDP -LocalPort 13223 -Action Block

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