What Range This Port Belongs To
Port 3605 falls in the registered ports range (1024-49151), sometimes called user ports. This range sits between the well-known ports (0-1023), which are reserved for foundational protocols like HTTP and DNS, and the ephemeral ports (49152-65535), which operating systems assign temporarily for outbound connections.
Registered ports require an application to request assignment from IANA. The intent is to reduce collisions — if your software registers a port, other software is supposed to use a different one. In practice, registration is voluntary, unenforced, and riddled with abandoned entries.
The Official Assignment
Port 3605 is registered to ComCam IO Port (service name: comcam-io), for both TCP and UDP. The assignment was made in September 2002.
ComCam appears to have been a communication camera or surveillance system — an early attempt at network-connected camera hardware. Beyond the registry entry itself, documentation is nearly nonexistent. No RFC defines the protocol. No active project uses the name. The company or product that claimed this port in 2002 has left no visible footprint.
This is not unusual. The registered port space contains hundreds of assignments made during the Internet's expansion years for products that shipped in small quantities, protocols that never stabilized, or companies that no longer exist. The registry is partly a historical record, partly a graveyard. 1
What You'd Actually Find on This Port
Almost certainly nothing. If software is listening on port 3605 on your machine, it isn't ComCam IO — it's something that chose this port because it happened to be available. Custom applications, game servers, development tools, and internal services routinely use registered ports without bothering to check the registry.
How to Check What's Listening
On Linux or macOS:
On Windows:
The output will show the process ID. From there, check your process list (ps aux on Linux/macOS, Task Manager on Windows) to identify what's running.
Why Unassigned Ports Matter
The port numbering system works because most software respects it. When a protocol claims a port and documents that claim in a standard, every firewall, router, and network monitor can make intelligent decisions about traffic on that port.
Ports like 3605 — assigned but dark — represent a mild form of namespace pollution. The space is technically claimed, so another legitimate service can't register it. But since nothing actually uses it, the claim provides no practical benefit. Over time, IANA has become more careful about new registrations for precisely this reason.
If you see traffic on port 3605 on a network you didn't configure, treat it the same way you'd treat any unexpected traffic: find out what's generating it before assuming it's benign.
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