Port 1065 has no official assignment. It's not SSH. It's not HTTP. It's not anything—at least not officially.
The Registered Range
Port 1065 lives in the registered port range: ports 1024 through 49151.1 These ports sit between the well-known ports (0-1023, reserved for standard services like HTTP and SSH) and the dynamic/ephemeral ports (49152-65535, used for temporary connections).
The registered range was created for services that want a consistent port number but don't qualify as fundamental Internet infrastructure. Organizations can apply to IANA to register a port in this range for their application or protocol.2 Port 1065 hasn't been claimed.
What "Unassigned" Means
Unassigned doesn't mean unused. It means no one has officially registered it with IANA. Any application can use port 1065 without asking permission. A database might listen here. A custom application might connect through it. A game server might claim it.
This flexibility is useful for developers who need a port and don't want to conflict with well-known services. But it also means you can't look at port 1065 and know what's supposed to be there. There is no "supposed to be."
Security Considerations
Unassigned ports sometimes appear in security contexts. The MITRE ATT&CK framework documents a technique (T1065) called "Uncommonly Used Port," which describes how malware sometimes communicates over non-standard ports to avoid detection.3 Port 1065 could theoretically be used this way—or by any legitimate application that needs a port.
The presence of traffic on port 1065 isn't inherently suspicious. But it's worth investigating, because unlike port 443 (which should be HTTPS) or port 22 (which should be SSH), there's no standard to compare against.4
If something is listening on port 1065 on your system, you should know what it is and why it's there.
How to Check What's Listening
On Linux or macOS:
On Windows:
These commands show what process, if any, is using port 1065. If you see something and don't recognize it, investigate. If you see nothing, the port is closed—which is probably fine.
Why Unassigned Ports Matter
The Internet has 65,535 ports per protocol (TCP and UDP). Only 1,024 are reserved for well-known services. The registered range—including port 1065—gives developers room to build without stepping on established standards.
But this freedom comes with responsibility. If you're building something that uses port 1065, document it. If you're investigating traffic on port 1065, don't assume. The port's meaning comes entirely from what's using it.
Port 1065 is potential. It's a door without a sign, a number without a name. What happens there depends entirely on who decides to use it.
Frequently Asked Questions About Port 1065
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