What Port 3057 Is
Port 3057 is officially unassigned. The Internet Assigned Numbers Authority (IANA) maintains the registry of every port with an official service — and 3057 has no entry.1
That doesn't mean nothing runs here. It means nothing is supposed to run here.
The Registered Port Range
Port 3057 sits in the registered port range (1024–49151). This range was originally called the "user ports" range, and for good reason: it's where applications go when they need a consistent port number but haven't formally registered with IANA — or where they've registered but you'll never see it in common documentation.
Well-known ports (0–1023) require elevated privileges to bind on most systems. The registered range does not. Any application can claim port 3057. Several have.
Observed Unofficial Uses
Star Trek: Armada II Multiplayer
Star Trek: Armada II (2001), the real-time strategy game, used port 3057 for multiplayer sessions. Players hosting LAN or online games needed this port forwarded through their router.2 It was a common fixture on port-forwarding guides of the era.
This use is now historical. The game's servers are long gone. If you see traffic on port 3057 in a home network context, it almost certainly isn't this.
Borland CaliberRM StarTeam Multicast Service
The more consequential use: Borland's StarTeam version control system bound its Multicast Service component to TCP port 3057. StarTeam was enterprise software — used by development teams to manage source code, requirements, and project artifacts.
In 2008, researchers disclosed CVE-2008-0311: a stack-based buffer overflow in the StarTeam Multicast Service (STMulticastService 6.4). An attacker could send an oversized HTTP GET request to port 3057 and execute arbitrary code with SYSTEM privileges — no authentication required.3
A Metasploit exploit module was published.4 The vulnerability affected CaliberRM 2006, 2007, and 2008. If a vulnerable version of StarTeam is still running somewhere (and it likely is — enterprise software lives long past its support window), port 3057 is an open door.
How to Check What's Listening on This Port
On Linux or macOS:
On Windows:
If something is listening, the process ID will tell you what. On Linux, lsof -i :3057 shows the process name directly.
If you're scanning a remote host:
Why Unassigned Ports Matter
The port registry isn't just bureaucratic paperwork. Unassigned ports are the wild west of networking — no formal documentation, no expected behavior, no common firewall rules targeting them by name.
That ambiguity cuts both ways. For a developer, an unassigned port is a blank canvas. For a security team, it's a blind spot: traffic on port 3057 won't trigger rules written for named protocols, and an old StarTeam service running here might not appear in anyone's asset inventory.
The Internet is full of port 3057-shaped gaps — ports that IANA never claimed but software did, quietly, decades ago, and some of which are still running.
Frequently Asked Questions
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