Port 2495: Unassigned — A Registered Port with No Tenant

What Port 2495 Is

Port 2495 has no assigned service. The Internet Assigned Numbers Authority (IANA) — the body responsible for the official registry of port numbers — lists it as unassigned. No RFC defines a protocol for it. No major application has staked a recognized claim.

It is not broken. It is not dangerous by nature. It is simply vacant.

The Range It Lives In

Port 2495 falls in the registered ports range: 1024–49151.

This range sits between two others:

• Well-known ports (0–1023): Reserved for foundational protocols — HTTP, HTTPS, SSH, DNS. Require elevated privileges to bind on most systems.
• Registered ports (1024–49151): Applications and services can formally register with IANA to claim a number in this range. Assignment is voluntary and documented, not enforced.
• Dynamic/ephemeral ports (49152–65535): Handed out temporarily by the operating system for outbound connections. Your browser is using several of them right now.

Within the registered range, IANA maintains a list of who has claimed what.¹ Port 2495 is not on that list. It has a street address in a mapped neighborhood — no building has been constructed.

Any Observed Unofficial Uses?

Nothing significant. Older security scanner databases flag port 2495 as historically associated with malware, a remnant of early-2000s trojan port lists that circulated widely and were copied between tools for years.² No specific, named piece of malware is prominently associated with it today, and no legitimate application has adopted it widely enough to be considered a de facto standard.

If you see traffic on port 2495, the most likely explanation is a custom internal application, a misconfigured service, or a security scanner testing your system — not an intrinsic property of the port number itself.

How to Check What Is Listening on Port 2495

On any system, you can see what process has claimed a port:

Linux / macOS:

# Show process listening on port 2495
ss -tlnp | grep 2495

# Or with lsof
lsof -i :2495

Windows:

netstat -ano | findstr :2495

The output will show the process ID. Match that to a process name with Task Manager or tasklist on Windows, ps aux on Linux/macOS.

If nothing is listening, the port is idle. Unassigned does not mean occupied.

Why Unassigned Ports Matter

The port numbering system only works because it is mostly coordinated. When two pieces of software independently decide to use the same port number, they collide — one blocks the other, or both fail silently.

IANA registration is voluntary, which means the registered range is partly a polite agreement: "I called this number, please don't use it." Unassigned ports like 2495 are the gaps in that agreement. They are available, unclaimed, and waiting.

Custom software frequently picks numbers like this on purpose — away from the crowded well-known range, not yet assigned to anything else. The downside is that nothing is guaranteed to stay unclaimed. A future IANA registration could create a conflict with any software that has quietly been using an unassigned port for years.