Port 2780: LBC Control — A Name Without a Story

What Port 2780 Is

Port 2780 technically has a name. The IANA registry lists it as lbc-control (LBC Control), registered for both TCP and UDP, with a private individual — Keiji Michine — as the contact.¹

That's where the documentation ends.

There is no RFC. No open-source software. No vendor page. No protocol specification. "LBC Control" appears in the registry the way a name appears in a phone book from thirty years ago — it was real once, or at least someone intended it to be, but there's nothing left to find.

This makes port 2780 an example of something common in the registered range: a ghost registration.

The Registered Port Range

Port 2780 falls in the registered ports range: 1024 through 49151.

These ports are maintained by IANA, the Internet Assigned Numbers Authority. Anyone can apply to register a port for their application. IANA doesn't verify that the software exists, that the documentation is public, or that the service ever ships. They record a name and a contact, and move on.

The result: hundreds of registered ports that are names without definitions. Port 2780 is one of them.

The registered range sits between the well-known ports (0-1023, reserved for foundational protocols like HTTP, SSH, and DNS) and the ephemeral/dynamic ports (49152-65535, used temporarily for outgoing connections). Registered ports are where applications live — both the widely used and the long-forgotten.

What Might Actually Be on Port 2780

If you see port 2780 open on a machine you administer, it's almost certainly not "LBC Control" — whatever that was. It could be:

• A custom internal application that picked an arbitrary port
• Development or testing software
• A game server or peer-to-peer application that chose this port informally
• Something misconfigured

Port numbers in the registered range are effectively suggestions. Nothing stops software from using any port it wants.

How to Check What's Listening

If you want to know what's actually using port 2780 on a machine:

On Linux or macOS:

ss -tlnp | grep 2780
# or
lsof -i :2780

On Windows:

netstat -ano | findstr :2780
# Then look up the PID:
tasklist | findstr <PID>

The process name will tell you what software opened the port. Cross-reference against what you expect to be running on that machine.

Why Ghost Registrations Exist

The IANA registry was designed for order — a way to prevent two applications from accidentally using the same port and creating chaos. But registration is voluntary, documentation requirements are minimal, and software evolves faster than registries do.

Companies get acquired. Projects get abandoned. Developers reserve ports for software that never ships. The result is a registry that's authoritative but incomplete — a map with some roads that no longer exist.

Port 2780 is one of those roads.