What Runs on Port 3552
Officially: TeamAgenda Server (service name: taserver), registered with IANA in July 2002 by Dany Ayotte of Teamsoft Solutions. 1
In practice: nothing. TeamAgenda was a cross-platform group scheduling application for Windows and macOS — think shared calendars, team schedules, and resource management, before Google Calendar made that a commodity. The server component listened on port 3552 to synchronize calendars across a team. The software reached version 5.0, added iPhone sync when that was novel, and then quietly stopped being developed.
If you see traffic on port 3552 today, it is not TeamAgenda. It is either a port scanner, random probing, or an application that picked the port arbitrarily.
The Registered Port Range
Port 3552 sits in the registered ports range: 1024 to 49151. 2
The ranges exist for a reason:
- 0 to 1023 (well-known ports): Reserved for foundational Internet services. HTTP gets 80. SSH gets 22. HTTPS gets 443. These require elevated system privileges to bind on most operating systems.
- 1024 to 49151 (registered ports): Available for applications to register with IANA. No root required to bind, but IANA tracks who claimed what to prevent collisions.
- 49152 to 65535 (dynamic/ephemeral ports): Unregistered. Used for temporary connections initiated by clients.
Registering a port with IANA means filing a request, naming a contact, and getting an entry in the registry. It does not mean IANA enforces the assignment or reclaims it when the software dies. There is no expiration date. TeamAgenda's claim on port 3552 will outlast the company by decades.
How to Check What Is Listening on Port 3552
If you see port 3552 active on a machine you manage, here is how to find out what is using it:
macOS / Linux:
Linux (alternative):
Windows:
The output will show the process ID (PID). Match the PID to a process name in Task Manager (Windows) or with ps aux | grep <PID> (Unix).
Why This Port Matters
Port 3552 is a small example of a larger truth about the port registry: it was designed for assignment, not lifecycle management. Software gets registered. Software dies. The ports stay registered.
This matters for network security. A firewall rule that blocks "all unassigned ports" would not block port 3552, because it is technically assigned. But nothing legitimate runs on it. The practical status of a port (what actually uses it) and the official status (what IANA says owns it) can diverge by years or decades.
When auditing a network, check both: what IANA says a port is for, and what is actually listening on it.
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