What This Port Is
Port 3692 sits in the registered ports range (1024-49151), the middle tier of the port numbering system. These ports are assigned by the Internet Assigned Numbers Authority (IANA) to specific services and applications that have formally requested them — they're not reserved for the operating system like ports below 1024, but they're not free-for-all ephemeral ports either.
According to the IANA registry, port 3692 is assigned to Brimstone IntelSync, service name intelsync, registered in February 2003 and attributed to someone named Davey Taylor.1 It was registered for both TCP and UDP.
The Ghost Problem
The software appears to be gone. No company, no product page, no documentation, no forum posts asking why IntelSync won't connect. The registration outlived whatever it was protecting.
This happens more than you'd expect. The registered ports range contains thousands of entries, many from companies and products that no longer exist. IANA doesn't reclaim them — port assignments are effectively permanent once made. So port 3692 sits in the registry, officially spoken for, practically unclaimed.
What's Likely Listening on It Today
Probably nothing intentional. If you see traffic on port 3692 on a modern system, it's almost certainly one of:
- A dynamic port assignment (your OS grabbed it opportunistically for an outgoing connection)
- Malware using an obscure registered port to blend into noise
- A misconfigured application
How to Check What's Using It
On macOS or Linux:
On Windows:
Then match the process ID to a running process to see what's actually there.
Why Orphaned Ports Matter
Port 3692 illustrates something real about the port system: registration doesn't mean activity, and absence from registries doesn't mean a port is empty. The registered range is full of these ghosts — names attached to numbers, companies that filed once in 2003 and disappeared.
If you're building something new and considering using port 3692, be aware that some firewalls and intrusion detection systems flag traffic on registered-but-unknown ports as suspicious. A port with no known owner draws more scrutiny than one with a clear documented purpose.
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