Port 2315 is a registered port. IANA lists its service name as precise-sft, attributed to something called "Precise Software." That is the entirety of the public record. No RFC. No documentation. No sign that this service ever ran on the public Internet in any meaningful way.
The Registered Port Range
Port 2315 belongs to the registered ports, also called user ports: numbers 1024 through 49151. This range sits between the well-known ports (0–1023, reserved for core Internet services like HTTP, DNS, and SSH) and the ephemeral ports (49152–65535, used temporarily by client connections).
To claim a number in this range, an organization applies to IANA. The assignment goes into the registry. The name gets attached to the port forever — or until someone formally requests its removal, which almost never happens.
Port 2315 is a registered claim. Someone at Precise Software, at some point, decided they needed a port number and filled out the paperwork.1
What "Precise Sft" Means
Nobody outside that company knows. "Sft" could mean "software," "server," "transfer," or nothing at all. The registration exists. The documentation does not. Security databases flag the port as having been used by malware historically — a common pattern with obscure registered ports, which make convenient cover precisely because they have a plausible-sounding name and no one is watching.2
This doesn't mean your network is under attack if you see port 2315 active. It means you should find out what's using it.
What to Do If You See This Port Active
If port 2315 is open on a system you manage, check what process owns it:
On Linux or macOS:
On Windows:
The process name that comes back will tell you what's actually running. If nothing familiar owns the port, investigate further.
Why Unassigned and Obscure Ports Matter
The IANA registry has tens of thousands of entries. Many are like this one — registered by companies for internal tools, never publicly documented, and eventually abandoned. The company may no longer exist. The software may have shipped once and never again.
These ports matter for one reason: ambiguity is a security surface. A port with a plausible-looking registered name is easier to overlook than a port with no name at all. It feels like it belongs. That feeling is the risk.
If you didn't put it there, verify it.
Frequently Asked Questions
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