What Port 2644 Is Registered For
Port 2644 (TCP and UDP) is officially registered with IANA under the service name travsoft-ipx-t — Travsoft IPX Tunnel.1
That name carries a whole era of computing history inside it.
The Protocol War This Port Remembers
In the 1990s, TCP/IP was not inevitable. Novell's NetWare dominated enterprise networking, and it ran on a different protocol stack: IPX/SPX (Internetwork Packet Exchange / Sequenced Packet Exchange). Hundreds of thousands of organizations had NetWare servers, IPX-addressed workstations, and applications built on the assumption that IPX was the network layer.
Then TCP/IP won. The Internet ran on it. The Web ran on it. And gradually, so did everything else.
But enterprises still had Novell infrastructure. They had IPX applications that couldn't be replaced overnight. So they needed a bridge: software that could wrap IPX packets inside IP packets and ship them across networks that only spoke TCP/IP. This is what IPX tunneling did. Travsoft was one company that built a solution and registered port 2644 for it.
It was not a niche problem. It was survival infrastructure for thousands of organizations in transition.
What This Port Looks Like Today
Travsoft and Novell NetWare are effectively gone from modern infrastructure. You will not encounter legitimate Travsoft IPX Tunnel traffic in 2025. If you see something actively using port 2644 on a contemporary system, it is almost certainly not this.
PhoneFree, an early VoIP application, also used port 2644 TCP for what it called its "Personal Communication Center."2 PhoneFree is also no longer in active use.
Port 2644 today is essentially unoccupied — registered, but quiet.
What's in the Registered Port Range
Port 2644 sits in the registered port range (1024–49151). These ports are:
- Not reserved for the OS (that's 0–1023, the well-known ports)
- Registered with IANA by specific applications or vendors
- Not protected — any process can bind to them without special privileges on most systems
Registration means IANA recorded the assignment. It does not mean anything is actively listening. Thousands of registered ports are effectively dormant, their original services long abandoned.
How to Check What's Using It
If you see traffic on port 2644 and want to know what it is:
On Linux/macOS:
On Windows:
The last column in the netstat output is the PID. Match that against Task Manager or tasklist to identify the process.
If something is listening on this port and you do not recognize it, that is worth investigating. Obscure port numbers in the registered range are occasionally used by malware precisely because they attract less scrutiny.
Why Unassigned-in-Practice Ports Matter
The port number space has a visible layer (well-known ports: 80, 443, 22) and a much larger invisible layer: thousands of registered ports for services that no longer exist, plus the vast ephemeral range used for outbound connections. Port 2644 lives in the gap between them — registered on paper, unused in practice.
This matters for one reason: when modern software needs a port to listen on, it sometimes lands here by chance or by bad design, colliding with the ghost of Travsoft's IPX tunnel. Understanding what a port was registered for helps distinguish expected silence from unexpected activity.
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