What Port 3578 Is
Port 3578 sits in the registered port range (1024–49151). These ports are not freely grabbed at runtime like ephemeral ports — they are nominally assigned through IANA, the organization that coordinates Internet numbering globally.1
In August 2002, someone registered port 3578 under the name "data-port" on both TCP and UDP. That is the entirety of the public record. No RFC. No protocol specification. No software named. The registration exists; the explanation does not.
What "Registered" Actually Means
A registered port means someone asked IANA for the number and IANA said yes. That's it. Before 2011, IANA's review process for registered ports was relatively light — RFC 6335 tightened requirements significantly, but thousands of earlier registrations slipped through with thin documentation.2
Port 3578's registration predates those stricter standards. Its service name, "data-port," is circular: every port carries data. The name excludes nothing and identifies nothing.
This is not unusual. The registered range contains hundreds of ports with orphaned, vague, or forgotten registrations — software that never shipped, companies that dissolved, protocols that never found users.
Known Unofficial Uses
None documented. Port scanners and security databases flag no consistent software using port 3578 in the wild. It does not appear in threat intelligence feeds as a known attack surface or malware channel.
If you see port 3578 active on a machine you manage, it is almost certainly application-specific — something a developer hardcoded, a gaming server, a custom internal tool. The port number itself tells you nothing about what it is.
How to Check What's Listening
On Linux or macOS:
On Windows:
The process ID from these commands will tell you exactly what software opened the port. That's more informative than any registry entry.
Why This Port Exists
The registered port range is large — over 48,000 numbers. IANA cannot actively audit or revoke registrations, and most registered ports are never meaningfully used. Port 3578 is an honest example of the gap between the registry as it is maintained and the registry as it works in practice.
If you need a port for an internal application and you're not planning to distribute software publicly, the ephemeral range (49152–65535) is a better choice — those ports carry no registration expectations by design.
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