Port 3272: Fujitsu User Manager — Registered, Forgotten

Port 3272 belongs to the registered port range (1024-49151). According to IANA's official registry, it is assigned to Fujitsu User Manager under the service name user-manager, supporting both TCP and UDP.¹

In practice, this registration is obscure enough that most port databases list 3272 as unassigned. If you're not running Fujitsu enterprise server management software, nothing should be listening here.

The Registered Port Range

The 1024-49151 range is where IANA takes applications from companies and organizations wanting to claim a port number for their software. Unlike well-known ports (0-1023), no special privilege is required to bind to these ports on most operating systems. And unlike ephemeral ports (49152-65535), they're intended for specific, named services.

The tradeoff: thousands of registrations accumulate over decades. Many represent products that are discontinued, niche, or simply never saw wide deployment. Port 3272 is that kind of registration—technically claimed, rarely occupied.²

Fujitsu User Manager

Fujitsu's user management tooling sits within their broader ServerView and infrastructure management ecosystem—enterprise software for managing Fujitsu servers in data center environments. Port 3272 was registered by Yukihiko Sakurai on behalf of Fujitsu for this component.¹

Documentation on what this service actually does at the protocol level is not publicly available. If you're administering Fujitsu server hardware and seeing activity on port 3272, that's expected. On anything else, it's worth investigating.

What to Check

If you see something listening on port 3272 and you're not running Fujitsu infrastructure:

On Linux/macOS:

sudo ss -tlnp | grep 3272
sudo lsof -i :3272

On Windows:

netstat -ano | findstr :3272

The process ID from either command will tell you what's bound to the port. Cross-reference against your running services.

On the network:

nmap -sV -p 3272 <target>

Why Unoccupied Ports Matter

Every port that's not listening is still a port that could be. Malware doesn't check IANA registrations before picking a number. Neither do developers configuring internal tools or custom applications.

If something unexpected is listening on port 3272, the IANA registration provides no assurance of legitimacy. The registration means Fujitsu claimed the number—not that anything running there is authorized on your network.