Port 1145 carries X9 iCue Show Control, a protocol used in broadcast television automation systems. If you see traffic on this port, someone is coordinating television production equipment—scheduling playlists, triggering video servers, synchronizing graphics systems, or controlling the precise timing that keeps a TV station running.
This is a registered port with an official IANA assignment.1 It exists for a specialized purpose that 99.9% of Internet users will never encounter.
What X9 iCue Show Control Does
Broadcast automation systems need to coordinate dozens of pieces of equipment: video servers, graphics generators, audio mixers, transmitter controls, satellite uplinks. When a commercial break hits at exactly the right second, when station IDs appear precisely on time, when shows transition without a glitch—that's show control working.
X9 iCue is one of several protocols that makes this coordination happen. The control system sends commands over port 1145 to trigger events, query device status, and ensure everything fires when it's supposed to.
The Registered Ports Range
Port 1145 sits in the registered ports range (1024-49151). These ports are assigned by IANA to specific services upon request. Unlike well-known ports (0-1023) which carry universally critical services like HTTP and DNS, registered ports serve more specialized purposes.
The registered range is where you find:
- Industry-specific protocols (like broadcast automation)
- Commercial software services
- Specialized network applications
- Enterprise systems that need a consistent port assignment
Organizations request a registered port when they need a standardized port number that won't conflict with other services. IANA assigns it, and anyone implementing that protocol knows to use that port.
Why You Probably Don't See This Port
Unless you work in broadcast television, you'll never encounter port 1145. It's not open on your router. Your operating system isn't listening on it. No consumer software uses it.
And that's exactly how the port system is supposed to work. Not every port needs to be universally relevant. Some ports exist for specialized industrial purposes—and those industries depend on having a standardized, non-conflicting port number they can rely on.
Checking What's Listening on Port 1145
If you want to see whether anything is listening on port 1145 on your system:
On Linux or macOS:
On Windows:
Using nmap to scan a remote system:
If nothing returns, nothing is listening. Which is what you'd expect unless you're running broadcast automation equipment.
Security Considerations
Port 1145 showing up in security logs usually means one of two things:
- Legitimate use — You're running broadcast automation equipment that actually uses X9 iCue
- Port scanning — Someone is scanning your network to see what services are running
If you don't operate broadcast equipment, there's no reason for this port to be open. Standard firewall practice applies: block what you don't use.
Why Specialized Ports Matter
The Internet isn't just HTTP and HTTPS. It's also:
- Broadcast automation (like port 1145)
- Industrial control systems
- Scientific instruments
- Medical devices
- Financial trading systems
- Countless other specialized applications
Each needs a numbered door. Each gets registered with IANA. Each serves a community that depends on it—even if the rest of us never see it.
Port 1145 exists for broadcast engineers who need show control to work reliably, consistently, and without conflict. For them, this port isn't obscure. It's infrastructure.
Frequently Asked Questions About Port 1145
Related Ports
Other broadcast and media production ports include:
- Port 9000 — Various show control and media protocols
- Port 5004-5005 — RTP (Real-time Transport Protocol) for streaming media
- Port 554 — RTSP (Real Time Streaming Protocol)
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