Port 1319 is officially registered with IANA for AMX ICSP (Integrated Control System Protocol), a proprietary protocol designed by AMX—now part of Harman—for professional audiovisual and building automation systems.1
What Runs on This Port
ICSP is the communication backbone for AMX automation products: touch panels, controllers, projectors, lighting systems, and other AV equipment found in conference rooms, auditoriums, and corporate campuses.2
When someone walks into a conference room, taps "Present" on a wall panel, and watches the lights dim, the shades lower, and the projector turn on—that's ICSP doing its work. Port 1319 carries the commands that orchestrate those actions.
How ICSP Works
The protocol operates primarily over TCP, enabling reliable transmission of commands, status updates, and data between devices.3 It's optimized for low-latency control applications—when you press a button on a touch panel, the lights need to respond immediately, not a second later.
ICSP uses a message-based structure where each command or response includes headers for device addressing and function identification. It supports both unicast instructions (tell this specific projector to turn on) and broadcast messaging (tell all displays in this room to go to standby).
The protocol typically runs on isolated networks dedicated to AV and building automation, separate from general-purpose IT networks. This isolation improves reliability and security—a crashed email server doesn't take down the conference room controls.
The AMX Ecosystem
AMX (acquired by Harman, which is owned by Samsung) has been building control systems since 1982. Their products are everywhere in professional installations:
- Corporate conference rooms and boardrooms
- University lecture halls and auditoriums
- Hotel ballrooms and meeting spaces
- Houses of worship
- Sports stadiums and arenas
- Museum exhibits and visitor centers
ICSP is embedded in the firmware of AMX hardware. When an IT administrator configures an AMX NetLinx controller or sets up a touch panel, they're working with devices that communicate over port 1319 by default.4
Port Configuration
While 1319 is the standard ICSP port, Harman's documentation notes that administrators can change it if needed—useful when integrating into networks where port 1319 is already in use or blocked.5 There's also a secure variant that uses port 1320 for encrypted ICSP communications.
The protocol supports both TCP and UDP, though TCP is more common for reliable command delivery.
Security Considerations
ICSP is proprietary and designed for isolated networks, not Internet exposure. These systems are typically behind corporate firewalls on dedicated VLANs.
However, as building automation systems become more connected, the attack surface grows. An exposed ICSP port on the public Internet could allow unauthorized control of AV equipment. Best practice is to:
- Keep ICSP traffic on isolated automation networks
- Use VPNs for remote access rather than exposing ports directly
- Enable authentication on AMX controllers where supported
- Monitor for unexpected connections to port 1319
Checking for ICSP
To see if port 1319 is active on your network:
Linux/macOS:
Windows:
Network scan:
If you find port 1319 open and you're not in a building with professional AV systems, that's worth investigating.
Why This Port Matters
Port 1319 represents a category of ports most people never think about: industrial and commercial control protocols. These aren't web servers or email. They're the specialized communication channels that make modern buildings intelligent.
The Internet isn't just computers talking to computers. It's thermostats, lighting controllers, access card readers, projectors, and thousands of other devices coordinating through protocols like ICSP. Port 1319 is one small window into that parallel network—the one that makes buildings respond to human needs.
Every time a conference room "just works," there's usually a protocol like ICSP making it happen. Invisible, proprietary, unglamorous—and essential to the experience of walking into a smart space that knows what you need before you ask.
Related Ports
- Port 1320 — AMX ICSP (Secure), encrypted variant of ICSP
- Port 1900 — UPnP, used for device discovery in some automation systems
- Port 8080 — HTTP alternate, sometimes used for AMX web interfaces
- Port 41794 — AMX NetLinx remote programming
Frequently Asked Questions
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