Port 3040: Tomato Springs — A Registered Port Nobody Remembers

What Range This Port Belongs To

Port 3040 is a registered port, sitting in the range from 1024 to 49151. This range is managed by IANA (the Internet Assigned Numbers Authority), which means organizations can formally claim a port number for their service by filing an application. Unlike the well-known ports below 1024 (which carry HTTP, SSH, DNS, and the other foundational protocols), registered ports serve more specialized or proprietary services.

Registered does not mean active. Many ports in this range were claimed, registered, and then quietly abandoned as the services they were meant to serve never launched, never gained adoption, or simply disappeared.

The Official Registration: Tomato Springs

IANA lists port 3040 as assigned to a service called "tomato-springs." ¹

That is the entirety of the official record. No RFC. No documentation. No company behind the name that can be traced. Someone registered the name at some point, and the port has sat in the registry ever since. This happens more than you might expect — the friction to register a port is low, and the requirement to maintain documentation is essentially nonexistent.

What Actually Runs on This Port

Despite the opaque official registration, port 3040 has shown up in real-world use:

Star Trek: Armada II (Fleet Operations) The Fleet Operations mod for Star Trek: Armada II — a real-time strategy game released in 2001 — uses port 3040 (TCP/UDP) as part of its multiplayer hosting configuration. Players setting up manual IP hosting need to forward this port along with a cluster of others. ²

PandaROM Update Service Port 3040 has been documented as used by PandaROM update processes. ³

Neither of these uses has anything to do with "Tomato Springs." They simply needed an available port, and this one was there.

How to Check What's Using This Port

If port 3040 is active on your machine, these commands will tell you why:

Linux / macOS:

# Show what process is listening on port 3040
ss -tlnp | grep 3040

# Or with lsof
lsof -i :3040

Windows:

netstat -ano | findstr :3040

Then take the process ID from the output and look it up:

tasklist /fi "PID eq <process_id>"

If something unexpected is listening on 3040, that warrants investigation. Unassigned and obscure ports are sometimes chosen by malware precisely because they attract less scrutiny.

Why Unassigned Ports Matter

The port number space is a shared resource. Every device on the Internet speaks the same language: a number from 0 to 65535 identifies which service a packet is headed for. This only works because of coordination — someone has to maintain the list.

IANA's registry is that list. When ports go unregistered or are registered and then abandoned, they become open territory. Applications claim them informally. Malware hides in them. Port scanners flag them. Network administrators write firewall rules around them.

Port 3040 is a small case study in what happens when the coordination breaks down: an official name no one recognizes, a game server using the number anyway, and a registry entry that answers nothing. ⁴