What Port 1975 Is
Port 1975 sits in the registered ports range (1024–49151). These ports are assigned by IANA upon request from software vendors and organizations. Unlike well-known ports (0–1023), they don't require elevated privileges to bind, and there are tens of thousands of them — most unknown to anyone outside the organization that registered them.
IANA's official entry for port 1975 lists the service as TCO Flash Agent, operating over both TCP and UDP.1 That name doesn't appear in any widely used software documentation, and the registration gives no contact or RFC to follow. It exists in the registry the way many registered ports do: technically official, practically opaque.
Known Associations
TCO Flash Agent (official): The IANA-registered service. No public documentation describes what it does or who maintains it. If you're running software that specifically uses this registration, you'd know it.
Aureate/Radiate spyware: Security researchers at SANS have noted port 1975 in connection with Aureate/Radiate, an early adware/spyware platform from the late 1990s and early 2000s that was bundled with shareware applications.2 If you're seeing this port active on a very old Windows system, that association is worth knowing.
xArrow SCADA software: CVE-2012-2426 through CVE-2012-2429 documented multiple vulnerabilities in xArrow, a SCADA application, that could be exploited via packets sent to port 1975. This is not a protocol definition — it's an application that happened to use this port and had security flaws.3
None of these constitute a dominant, current use. If port 1975 is open on a system you're investigating, the service name alone won't tell you what's there.
How to Check What's Using It
On Linux or macOS:
On Windows:
Then match the process ID to a running process via Task Manager or tasklist. That's the only reliable way to know what's actually listening there.
Why Unassigned and Obscure Ports Matter
The registered ports range was designed to give software vendors a way to claim a consistent port so their applications don't collide with each other. In practice, registration is voluntary, many registrations go stale, and the actual software landscape ignores the registry freely.
Port 1975 is a good example of the gap between the registry and reality. IANA says it belongs to TCO Flash Agent. Security researchers associated it with spyware. A SCADA vendor used it for something else entirely. The port itself doesn't enforce anything — it's just a number. What matters is what's bound to it on any given machine.
An open port you don't recognize is always worth investigating, regardless of what IANA says it should be.
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