What This Port Is
Port 3519 sits in the registered port range — numbers 1024 through 49151 that software vendors can formally claim through the Internet Assigned Numbers Authority. The idea is orderly: apply, get assigned, avoid collisions.
IANA records two services here:
- TCP 3519:
nvmsgd— the Netvion Messenger daemon - UDP 3519:
galileo— the Netvion Galileo Port, a location-tracking system
Port 3520 rounds out the suite as the Galileo log port.
Who Was Netvion
Netvion was a software company that registered these ports, likely around 2002, for two products: an enterprise messenger and a system called Galileo that appears to have handled location or GPS data. Beyond that, the trail goes cold. There is no active website, no documentation, no user communities. The products are gone. The IANA entries remain.
This is not unusual. Thousands of registered port assignments belong to companies that no longer exist or products that were never widely deployed. The registry was never designed to expire stale entries.
What's Actually There Now
Almost certainly nothing. If you scan port 3519 on a random host, you won't find Netvion software. What you might find is whatever unrelated process happened to claim that port dynamically, or nothing at all.
SANS ISC logs occasional scanning activity against port 3519 from various international IP addresses — reconnaissance, not targeted exploitation. No known malware families specifically use this port, and no CVEs reference it.1
How to Check What's Listening
If you want to know what's using port 3519 on your own machine:
macOS / Linux:
Linux alternative:
Windows:
If something shows up, it's almost certainly not Netvion. It could be an application that chose a high-numbered port arbitrarily, or a process that received this port as a dynamic assignment from the OS.
Why Orphaned Ports Matter
The registered range was meant to bring order. In practice, it accumulated the archaeology of the software industry — ports claimed by products that didn't survive, companies that got acquired, experiments that never shipped.
Port 3519 is harmless. But multiplied across thousands of entries, these orphaned registrations represent a quiet gap between the registry's intent and reality. Nothing enforces the claim. Nothing cleans up the abandoned ones. The map and the territory have drifted apart, and this is one of the small ways you can see it.
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