Port 2515 — Unassigned Registered Port

What Port 2515 Is

Port 2515 is unassigned. The Internet Assigned Numbers Authority (IANA), which maintains the official registry of port numbers, lists no service for this port.¹

That's the complete official story.

The Range It Lives In

Port 2515 falls in the registered ports range (1024–49151). This range sits between the well-known ports (0–1023), which are reserved for foundational protocols like HTTP, DNS, and SSH, and the dynamic ports (49152–65535), which operating systems hand out temporarily for outbound connections.

The registered range works on an honor system. Anyone can submit an application to IANA and, if approved, get a port number assigned to their service. Most of the range has been claimed — but not all of it. Port 2515 is one of the gaps.

Known Unofficial Uses

None documented. Some security databases flag port 2515 as having been "used by malware in the past," but this warning applies to hundreds of ports and provides no useful information. Malware doesn't respect port assignments — it uses whatever is open or convenient. The flag is worth noting but not worth worrying about on its own.²

If you find something listening on port 2515, that's worth investigating — but it's probably a local application, a development server, or a game that picked an available number, not something malicious.

How to Check What's Listening

If port 2515 is active on a machine you control, these commands will tell you what's using it:

macOS / Linux:

lsof -i :2515

Linux (alternative):

ss -tlnp | grep 2515

Windows:

netstat -ano | findstr :2515

The output will show the process name and PID. From the PID, you can identify the exact application.

Why Unassigned Ports Exist

The port space has 65,535 numbers. That sounds like a lot until you consider that thousands of applications, games, databases, and proprietary systems all need their own numbers. IANA tries to keep the registered range organized, but official assignment requires an application, documentation, and review. Many applications simply pick a number that isn't taken and start using it — never going through formal registration.

Port 2515 is unclaimed territory. It's not broken or dangerous. It's just empty.