HTTPfy

Port 13823 (bmdss)

IANA assigns port 13823 to bmdss: Blackmagic Design Streaming Server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
bmdss TCP Blackmagic Design Streaming Server Sam Vaughan -

Registry dates for this port: registered 2011-03-01.

Check what is listening on port 13823

Linux: is anything listening on TCP 13823?
sudo ss -tlnp 'sport = :13823'
Linux / macOS: which process owns the port
sudo lsof -nP -i :13823
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':13823 '
Windows (Command Prompt)
netstat -ano | findstr :13823
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 13823 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 13823
From Windows
Test-NetConnection HOST -Port 13823

Block port 13823 in the firewall

ufw
sudo ufw deny 13823/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 13823 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 13823 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 13823' -Direction Inbound -Protocol TCP -LocalPort 13823 -Action Block

Related ports

13821dsmcc-download13822dsmcc-ccp13832a-trust-rpc13894ucontrol

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