Port 32400 (plex)

IANA assigns port 32400 to plex: Plex multimedia.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

plex TCP Plex multimedia Plex Inc. -

Registry dates for this port: registered 2016-06-02.

Linux: is anything listening on TCP 32400?

sudo ss -tlnp 'sport = :32400'

Linux / macOS: which process owns the port

sudo lsof -nP -i :32400

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':32400 '

Windows (Command Prompt)

netstat -ano | findstr :32400

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 32400 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 32400

From Windows

Test-NetConnection HOST -Port 32400

ufw

sudo ufw deny 32400/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 32400 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 32400 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 32400' -Direction Inbound -Protocol TCP -LocalPort 32400 -Action Block

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