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Port 4432 (l-acoustics)

IANA assigns port 4432 to l-acoustics: L-ACOUSTICS management.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
l-acoustics TCP L-ACOUSTICS management L-ACOUSTICS -
l-acoustics UDP L-ACOUSTICS management L-ACOUSTICS -

Registry dates for this port: registered 2012-08-13.

Check what is listening on port 4432

Linux: is anything listening on TCP 4432?
sudo ss -tlnp 'sport = :4432'
Linux: UDP 4432
sudo ss -ulnp 'sport = :4432'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4432
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4432 '
Windows (Command Prompt)
netstat -ano | findstr :4432
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4432 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4432
From Windows
Test-NetConnection HOST -Port 4432
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4432

Block port 4432 in the firewall

ufw
sudo ufw deny 4432/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4432 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4432 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4432' -Direction Inbound -Protocol TCP -LocalPort 4432 -Action Block
ufw
sudo ufw deny 4432/udp
iptables
sudo iptables -A INPUT -p udp --dport 4432 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4432 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4432' -Direction Inbound -Protocol UDP -LocalPort 4432 -Action Block

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