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Port 4170 (d-cinema-csp)

IANA assigns port 4170 to d-cinema-csp: SMPTE Content Synchonization Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
d-cinema-csp TCP SMPTE Content Synchonization Protocol Michael Karagosian -

Registry dates for this port: registered 2008-09-04.

Check what is listening on port 4170

Linux: is anything listening on TCP 4170?
sudo ss -tlnp 'sport = :4170'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4170
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4170 '
Windows (Command Prompt)
netstat -ano | findstr :4170
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4170 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4170
From Windows
Test-NetConnection HOST -Port 4170

Block port 4170 in the firewall

ufw
sudo ufw deny 4170/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4170 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4170 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4170' -Direction Inbound -Protocol TCP -LocalPort 4170 -Action Block

Related ports

4168pslicser4169iadt, iadt-disc4171ml-svnet4172pcoip

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