What This Port Is
Port 3173 sits in the registered ports range (1024–49151). These are ports that any organization can claim by filing with IANA, distinguishing them from the well-known ports (0–1023) that require special OS privileges to bind.
IANA's registry shows port 3173 assigned to SERVERVIEW-ICC on TCP and UDP, registered May 15, 2009.1 What SERVERVIEW-ICC actually does is harder to answer. The registration exists. Documentation does not.
The Registered Name: SERVERVIEW-ICC
"ServerView" is a server management platform from Fujitsu. ICC likely refers to an inter-component communication channel—the kind of internal service that health monitoring software uses to coordinate between agents, daemons, and management consoles.
If this is Fujitsu ServerView infrastructure, port 3173 would be internal traffic between server management components—not something you'd expose to the Internet, and not something most networks would see in the wild. That explains the silence: it's a plumbing port for enterprise hardware management, used internally and never advertised.
The Gaming Overlap
Port 3173 also falls within the range 3074–3174 UDP, which Rainbow Six Vegas used for online multiplayer.2 This is unofficial and overlapping—the game never "owned" this port in any registered sense. It's just one number in a broad sweep the game client might use.
If you're troubleshooting gaming connectivity and see traffic on 3173 UDP, that's the likely culprit.
Who's Scanning It
SANS ISC logs show periodic scanning activity against port 3173—automated probes from IPs sweeping through port ranges, not targeted attacks.3 There are no documented exploits or CVEs associated with this port. The scans are the background noise of the Internet, not a signal about this port specifically.
How to Check What's Listening
If you see activity on port 3173 and want to know what's using it:
macOS / Linux:
Windows:
The process ID from those commands will tell you exactly which application claimed the port.
Why Unassigned and Lightly Documented Ports Matter
The registered ports range contains thousands of ports like 3173—names on paper, services that ran briefly or internally, gaming clients that swept through ranges without registering anything. This is normal. The port system doesn't require services to be famous to claim a number.
What matters for your network: if port 3173 shows up in traffic you didn't expect, find out what's using it. An unknown process listening on any port is worth investigating. The IANA label gives you a starting hypothesis (Fujitsu ServerView), but only your system can tell you the truth.
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