Port 1682: Lanyon-Lantern — A Name Without a Service

What Port 1682 Is

Port 1682 sits in the registered ports range (1024–49151). These ports are not reserved for the operating system like the well-known ports below 1024, and they are not purely ephemeral like the dynamic ports above 49151. They occupy the middle ground: ports that individuals and organizations can formally claim with IANA for specific services.

Port 1682 has been claimed. IANA's registry lists it as assigned to a service called lanyon-lantern, registered under the contact robin.lewis@lanyon.com.¹

That email domain no longer exists independently. Lanyon Solutions, the company behind the registration, merged into Cvent in 2017.²

The Service That Isn't

"Lanyon-lantern" appears in IANA's registry with no description — just the name, the port numbers (both TCP and UDP), and the registrant's contact information. No RFC was ever published. No technical documentation is publicly available. No open-source projects reference it. No traffic analysis reports mention it.

Whatever lanyon-lantern was — likely an internal communication service for Lanyon's hospitality and events software — it lived and died within a proprietary product that has since been absorbed into another company.

The reservation persists. The service almost certainly does not.

What This Port Range Means

The registered ports exist because coordination matters. Without a registry, two different applications might both try to listen on the same port number, and every firewall rule written for one would accidentally apply to the other.

IANA maintains the registry to prevent collisions, but registration does not guarantee longevity. Companies register ports for internal services, products get discontinued, companies merge. The name in the registry outlives the thing it named.

Port 1682 is a small record of something that once needed a port and no longer does.

What to Do If You See This Port

If port 1682 shows up in your network traffic or firewall logs, it is almost certainly not the old Lanyon service. Treat it as an unknown and investigate normally.

Check what's listening:

# macOS / Linux
sudo lsof -i :1682
sudo ss -tlnp | grep 1682

# Windows
netstat -ano | findstr :1682

Check for established connections:

sudo netstat -anp | grep 1682

If something is actively using this port, identify the process. Unassigned or dormant registered ports occasionally get used by applications that chose a number without checking the registry, or by malware looking for a quiet corner.