Port 30033 (TeamSpeak file transfer)

TeamSpeak 3 file transfer (avatars, channel files).

Registered (user) port, 1024-49151 TCP Voice, video and chat Meant to face the internet

What port 30033 is used for

TeamSpeak 3 file transfer (avatars, channel files).

Meant to face the internet. Needed for clients if file transfer is enabled.

Port 30033 is in the registered range and has no IANA assignment. The usage above is unofficial but widespread.

Linux: is anything listening on TCP 30033?

sudo ss -tlnp 'sport = :30033'

Linux / macOS: which process owns the port

sudo lsof -nP -i :30033

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':30033 '

Windows (Command Prompt)

netstat -ano | findstr :30033

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 30033 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 30033

From Windows

Test-NetConnection HOST -Port 30033

ufw

sudo ufw allow 30033/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 30033 -j ACCEPT

nftables

sudo nft add rule inet filter input tcp dport 30033 accept

Windows Firewall

New-NetFirewallRule -DisplayName 'Allow TCP 30033' -Direction Inbound -Protocol TCP -LocalPort 30033 -Action Allow

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