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Port 9987 (TeamSpeak 3 voice)

TeamSpeak 3 voice; 30033 is file transfer and 10011 the ServerQuery admin port.

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

Port 9987 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

What port 9987 is used for

TeamSpeak 3 voice; 30033 is file transfer and 10011 the ServerQuery admin port.

Security: should port 9987 be open?

Meant to face the internet. Keep ServerQuery (10011) bound to localhost and update the server.

IANA assignment

Service nameProtoDescriptionAssigneeReference
dsm-scm-target TCP DSM/SCM Target Interface Mike Dyslin -
dsm-scm-target UDP DSM/SCM Target Interface Mike Dyslin -

Registry dates for this port: registered 2006-08.

Check what is listening on port 9987

Linux: UDP 9987
sudo ss -ulnp 'sport = :9987'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9987
Windows (Command Prompt)
netstat -ano | findstr :9987
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 9987

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9987

Open port 9987 in the firewall

ufw
sudo ufw allow 9987/udp
iptables
sudo iptables -A INPUT -p udp --dport 9987 -j ACCEPT
nftables
sudo nft add rule inet filter input udp dport 9987 accept
Windows Firewall
New-NetFirewallRule -DisplayName 'Allow UDP 9987' -Direction Inbound -Protocol UDP -LocalPort 9987 -Action Allow

Related ports

64738Mumble10011TeamSpeak ServerQuery30033TeamSpeak file transfer9981pumpkindb9986kaostransport9988nsesrvr9990osm-appsrvr

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.