What This Port Is
Port 3062 sits in the registered port range — 1024 through 49151 — the tier where software vendors claim numbers by applying to IANA. Unlike the well-known ports below 1024, registered ports don't require root access to bind, and their assignments reflect a mix of actively deployed protocols, legacy reservations, and names that made it into the registry but never into widespread use.
IANA lists port 3062 as assigned to ncacn-ip-tcp on both TCP and UDP.1
What ncacn-ip-tcp Actually Means
The name sounds like a protocol but is more accurately a label. In Microsoft's implementation of DCE RPC (Distributed Computing Environment Remote Procedure Call), ncacn_ip_tcp is the protocol sequence string that means "RPC over TCP/IP." It's the value you'd pass to functions like RpcStringBindingCompose to tell the Windows RPC runtime which transport to use.2
The catch: Windows RPC doesn't use fixed ports like this. Instead, the RPC Endpoint Mapper — listening on port 135 — acts as a directory. A client contacts port 135, asks which port a particular service registered on, and gets directed to a dynamic port, typically somewhere in the 49152–65535 ephemeral range. Port 3062 doesn't appear in this workflow in any documented way.
The IANA entry for port 3062 likely reflects an administrative reservation rather than an actively deployed service. The number is occupied on paper; in practice, you're unlikely to find anything listening there.
Scanning Activity
SANS Internet Storm Center logs show occasional reconnaissance traffic hitting port 3062, consistent with automated scanners sweeping the registered port range rather than targeting anything specific.3 If you see this traffic in your logs, it's almost certainly noise, not a probe of something real.
How to Check What's Listening on This Port
If you need to know what's actually using port 3062 on a specific machine:
Linux / macOS:
Windows:
The process ID in the output can be cross-referenced in Task Manager or with tasklist /fi "PID eq <pid>".
Finding nothing is the expected result.
Why Unassigned-in-Practice Ports Matter
The registered port range contains thousands of entries in varying states — actively used, abandoned, speculatively claimed, and cryptically named. They matter because:
- Firewall policy often uses port ranges, and knowing which ports are nominally assigned (versus truly ephemeral) shapes how rules get written
- Anomaly detection depends on knowing what's normal; a registered port with no observed traffic suddenly receiving connections is worth investigating
- Port exhaustion in ephemeral ranges can push some applications into registered-port territory, making conflicts possible
Port 3062's story is common: a name in a registry, a scanner's occasional curiosity, and almost certainly nothing behind the door.
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