What This Port Is
Port 10164 is a registered port, meaning it falls within the 1024-49151 range designated by IANA for services that apply for and receive assignments. Unlike the well-known ports (0-1023) which have been claimed and named, or the ephemeral ports (49152-65535) which are temporary and ever-changing, registered ports represent a kind of middle space: officially available, but not yet spoken for.
Currently, port 10164 has no official IANA assignment. No recognized protocol or service owns it.
The SNMP Confusion
Online sources sometimes associate port 10164 with SNMP (Simple Network Management Protocol). This appears to be folklore rather than fact. The actual SNMP port landscape is this:
- Port 161 — Standard SNMP agent requests (UDP)
- Port 162 — Standard SNMP notifications/traps (UDP)
- Port 10161 — Secure SNMP with TLS/DTLS (UDP)
- Port 10162 — Secure SNMP notifications with TLS/DTLS (UDP)
Port 10164 does not appear in any official SNMP documentation, RFC, or security guidance. It's close enough to ports 10161-10162 that some people assume it's related, but the official protocol stops at 10162. It's a ghost port.
How to Check What's Listening
To see if anything is actually using port 10164 on your system:
On macOS or Linux:
On Windows (PowerShell):
From another machine (network scan):
Unless you've explicitly configured something to listen on 10164, you'll find nothing there.
Why Unassigned Ports Matter
The existence of thousands of unassigned ports in the registered range tells you something important: the port space is not crowded. Of 48,128 registered ports available, we actively use perhaps 50. The rest are reserve.
This matters because it means:
- No naming conflicts — If you need a port for an experimental protocol or internal service, you can claim one without stepping on anyone's toes
- Reserved for future growth — The IANA system expects that eventually, the Internet will need more services, and these ports are waiting
- Security through relative obscurity — Attackers scanning for open ports will find your service even if it's on 10164, but at least a default port scanner looking for port 23 (Telnet) or 445 (Windows file sharing) won't automatically target it
- Freedom for dark patterns — Every unassigned port is a door no one's claimed. Some organizations run internal services on random registered ports. Some malware does the same. It's a blank slate.
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