What This Port Is
Port 3416 sits in the registered ports range (1024–49151). IANA assigned it in February 2002 to something called the AirMobile IS Command Port, with the service name commandport. It runs on both TCP and UDP.
That's about all the Internet has to say about it.
The Registered Ports Range
Ports 1024–49151 are registered ports. Unlike well-known ports (0–1023), they don't require root privileges to open, and unlike ephemeral ports (49152–65535), they carry some intent — someone formally requested them from IANA and committed a service name to the global record.
Getting a port registered isn't complicated, but it is deliberate. You fill out a form, describe your service, and IANA adds your name to the registry.1 The idea is to reduce collisions: if everyone documents what port their software uses, two applications are less likely to fight over the same one.
Port 3416 went through that process. Someone at AirMobile cared enough to do it.
AirMobile IS
AirMobile IS was an enterprise mobile information system — software for managing mobile workers, likely field technicians or logistics teams, in the early days of mobile enterprise computing. 2002 was the era of Windows CE, Palm OS, and Blackberry, when getting data to a person in the field was genuinely hard and companies were building infrastructure around it.
AirMobile registered this port as their command channel: the port the server-side software listened on for commands from mobile clients. It was the spine of their system.
The company left almost no trace on the modern web. No Wikipedia entry, no Crunchbase record, no acquisition announcement. The port registration is the clearest evidence they existed. The software is gone. The port remains.
What's Actually on This Port Now
Nothing standardized. If you see traffic on port 3416, it's almost certainly something local to your network — a piece of software that picked this port arbitrarily, or something misconfigured.
To check what's using it on your system:
macOS / Linux:
Windows:
If something is listening here that you didn't put here intentionally, find out what it is.
Why Unassigned-in-Practice Ports Matter
The registered ports range has thousands of entries like this: formally claimed, once meaningful, now orphaned. The software company dissolved, got acquired, or just stopped shipping. The protocol the port served is dead. But the registration stays in the IANA table indefinitely.
This is actually fine — IANA's registry is a record of intention, not a guarantee of activity. The value is in the documentation: any developer building something new can check whether a port is claimed before using it. Port 3416 being in the registry means no one else should build new software that defaults to it.
The registry is a map. Maps outlast the roads they were drawn for.
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