What This Port Does
Port 2639 is assigned to AMInet, a UDP-based Ethernet control protocol developed by Alcorn McBride Inc. — a manufacturer of show control, audio, and video playback systems for the themed entertainment industry.
IANA lists this assignment for both TCP and UDP, with Alcorn McBride as the registrant.1
In practice, AMInet runs over UDP. Show controllers broadcast control messages to the network using UDP packets sent to the broadcast IP address and port 2639. Devices on the network that recognize the message respond to the sender's IP address and port.2
The Protocol's World
Alcorn McBride equipment is behind the scenes at virtually every major theme park on the planet — Disney, Universal, and hundreds of others. Their show controllers are purpose-built embedded systems, not general-purpose computers. They don't crash from OS updates. They don't get malware. They run the same attraction, reliably, every three minutes, for years.
AMInet is how these controllers talk to each other over Ethernet — sending cues, synchronizing playback, coordinating the precise timing that makes a ride feel like a choreographed experience rather than a collection of independently running machines.
Steve Alcorn, the company's founder, got his start writing show control systems for Epcot Center at Walt Disney Imagineering in 1982. He founded Alcorn McBride Inc. in 1986.3 The company now makes the hardware running attractions at parks that Disney contractually prohibits him from listing by name in his marketing materials.
Port Numbers in Context
Within Alcorn McBride's protocol suite, port 2639 is specifically used for system downloads to devices. Port 2637 is used for standard runtime UDP communication. If you see traffic on 2639 in a themed entertainment or museum environment, it is almost certainly Alcorn McBride hardware downloading configuration or firmware to show controllers.2
What Range This Port Belongs To
Port 2639 sits in the registered port range (1024–49151). These ports are documented in the IANA registry and assigned to specific applications and services by request — they are not reserved for OS use like the well-known ports (0–1023), but they are not ephemeral scratch space either.
A registration means someone asked IANA to record that their application uses this port, helping avoid conflicts. It does not mean the protocol is public, standardized, or widely implemented — only that one company staked a claim.
How to Check What's Listening
If you see activity on port 2639 on your own system and want to know what's using it:
macOS / Linux:
Windows:
These commands will show you the process ID and name of whatever has bound to that port. On a machine that has no Alcorn McBride hardware or control software installed, nothing should be listening here.
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