Port 2109 is officially assigned to Ergolight, a networked lighting control system developed by Ledalite, a Canadian lighting manufacturer later acquired by Philips.
It runs on both TCP and UDP.
What Ergolight Was
In the mid-1990s, Ledalite built office lighting fixtures that could be managed over a standard Ethernet network. The system used CAT5 cabling in a daisy-chain topology, connecting fixtures back to a Master Control Unit that acted as a server on your LAN.
The pitch: computers on the network could communicate with every fixture, responding to occupancy sensors and daylight levels to dim or turn off lights automatically. Ledalite claimed the system reduced lighting energy consumption by up to 80%.1
This was networked smart lighting before "smart lighting" existed as a consumer category. And to make it work over a LAN, Ledalite registered port 2109 with IANA.
The assignee on record is Jindra Ryvola at ledalite.com.2
What This Port Looks Like Today
Ergolight is a commercial product from a company that was absorbed into Philips decades ago. If you see traffic on port 2109, it's almost certainly one of two things:
- Legacy Ergolight hardware still running somewhere in an older office building
- Something unrelated using the port informally, since few systems would know or care about its registered assignment
It is not a port you'd encounter in normal network operation.
How to Check What's Using Port 2109
If you see activity on this port and want to know what's listening:
On macOS or Linux:
or
On Windows:
Then match the process ID (PID) to a running application in Task Manager or with ps aux.
Why Registered Ports Like This Matter
The registered port range (1024–49151) is where companies and projects stake their claim to a number. IANA maintains the registry so that, in theory, two applications don't accidentally collide on the same port.
In practice, the registry is full of products like Ergolight: niche commercial systems, long-discontinued software, internal tools from companies that no longer exist. Most of these ports sit silent on the modern Internet, their original purpose forgotten.
Port 2109 is one of thousands of quiet registrations — a small artifact of a company that wanted its lighting fixtures to have their own address on the network.
Frequently Asked Questions
Беше ли полезна тази страница?