Port 2654: Unassigned — Registered Range, Informal Use

What Range This Port Belongs To

Port 2654 sits in the registered ports range (1024–49151), sometimes called the "user ports." This range is managed by IANA, but registration is voluntary — any application can bind to an unassigned port without asking permission.

The registered range exists between two others:

• Well-known ports (0–1023): Reserved, tightly controlled, require IANA assignment and operating system privileges to bind
• Dynamic/ephemeral ports (49152–65535): Assigned temporarily by the OS for outbound connections, never registered

Registered ports are the middle ground: stable enough to document, informal enough that gaps are common.

IANA Status

IANA has no official service assignment for port 2654. The slot is empty in the official registry.¹

Observed Unofficial Uses

Informal port databases consistently list port 2654 as associated with Corel VNC Admin — a remote desktop and administration interface that Corel shipped as part of its software suite.² VNC (Virtual Network Computing) lets one machine control another's desktop remotely; Corel appears to have routed its admin interface through this port without formally registering it with IANA.

This is not unusual. Many applications pick ports from the registered range, use them consistently, and never bother with the paperwork. The port works. The software ships. The registration never happens.

Some security databases flag port 2654 as having been used by malware in the past.³ This is a common pattern: attackers sometimes exploit ports associated with legitimate remote administration tools because firewall rules may already permit them.

How to Check What's Listening

If you see activity on port 2654 and want to know what's behind it:

On Linux or macOS:

ss -tlnp | grep 2654
# or
lsof -i :2654

On Windows:

netstat -ano | findstr :2654
# Then look up the PID:
tasklist | findstr <PID>

If nothing is listening, you're fine. If something is, and you don't recognize it, that warrants investigation — especially on a server.

Why Unassigned Ports Matter

The registered port range has 48,128 slots. A substantial number are unassigned. This isn't a problem — it's the design. The range provides breathing room for applications that need predictable ports without the overhead of formal registration.

What it means in practice: an open port in this range doesn't tell you much on its own. It could be a legitimate application, a legacy tool like Corel VNC Admin, or something that has no business being there. The port number is just an address. What matters is what's behind the door.