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Port 9612 (streamcomm-ds)

IANA assigns port 9612 to streamcomm-ds: StreamComm User Directory.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
streamcomm-ds TCP StreamComm User Directory Brian C Wiles -
streamcomm-ds UDP StreamComm User Directory Brian C Wiles -

Check what is listening on port 9612

Linux: is anything listening on TCP 9612?
sudo ss -tlnp 'sport = :9612'
Linux: UDP 9612
sudo ss -ulnp 'sport = :9612'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9612
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9612 '
Windows (Command Prompt)
netstat -ano | findstr :9612
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9612 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9612
From Windows
Test-NetConnection HOST -Port 9612
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9612

Block port 9612 in the firewall

ufw
sudo ufw deny 9612/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9612 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9612 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9612' -Direction Inbound -Protocol TCP -LocalPort 9612 -Action Block
ufw
sudo ufw deny 9612/udp
iptables
sudo iptables -A INPUT -p udp --dport 9612 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9612 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9612' -Direction Inbound -Protocol UDP -LocalPort 9612 -Action Block

Related ports

9599robix9600micromuse-ncpw9614iadt-tls9616erunbook-agent, erunbook_agent

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