What Port 3064 Is
Port 3064 sits in the registered port range (1024-49151). These ports are assigned by IANA to specific services and applications, distinguishing them from the well-known ports below 1024 (HTTP, SSH, DNS) and the ephemeral ports above 49151 that operating systems assign on the fly for outbound connections.
IANA lists port 3064 as RPRT (Remote Port Redirector) on both TCP and UDP.1 The registration is minimal: a name, a number, a protocol. No RFC. No specification document. No major software ships with it configured by default.
The distributed.net Connection
The most documented unofficial use of port 3064 comes from distributed.net, a volunteer computing project that ran through the 1990s and 2000s. Participants donated idle CPU time to crack cryptographic challenges, most famously the RSA DES challenges that helped demonstrate the weakness of 56-bit encryption.
To coordinate work across thousands of machines, distributed.net ran proxy servers. Those proxies communicated on port 3064. The SANS Internet Storm Center logged it specifically as a "distributed.net proxy test port" used for coordinating nodes.2
The project was legitimate, the mission was real, but the proxy software was closed-source, which drew criticism from the open-source community. The project eventually wound down as its original challenges were solved or discontinued.
What You'll Find Here Today
Almost nothing. distributed.net's active coordination on this port has largely ceased. The IANA registration remains, but no major modern software targets port 3064 by default.
If you see activity on this port, check what's listening before assuming anything.
How to Check What's Using This Port
On Linux or macOS:
On Windows:
Then cross-reference the process ID (PID) with Task Manager or:
Why Unassigned Ports Matter
The registered port range exists to reduce collisions. When two applications independently pick the same port, one of them fails. IANA registration is voluntary, but it establishes a public record: this port is spoken for.
Port 3064's registration means any new software choosing a home should look elsewhere. The room is reserved, even if the tenant rarely shows up.
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