What Port 1354 Is (Officially)
Port 1354 is registered in the IANA Service Name and Transport Protocol Port Number Registry to a service called "Five Across XSIP Network" for both TCP and UDP.12
That's all the official record tells us. No RFC. No documentation. No company website. The service registered this port and then disappeared.
The Mystery of XSIP
Searching for "Five Across XSIP Network" returns only port databases—copies of the IANA registry echoing the same sparse information back and forth across the Internet. No technical documentation. No user guides. No trace of what "XSIP" stood for or what problem it was trying to solve.
The name suggests something related to SIP (Session Initiation Protocol), which handles voice and video communication. The "X" prefix often means "extended" or proprietary. But that's speculation. The truth is: we don't know.
What Registered Ports Are
Port 1354 sits in the registered ports range (1024-49151). This range is managed by IANA, and organizations can request specific port numbers for their services by submitting an application describing what the port will be used for.3
Someone at "Five Across" did exactly that. IANA approved it. The port was assigned. And then... nothing.
Why This Matters
The Internet is full of ghost ports like 1354. Services that were built, registered, and abandoned. Startups that folded. Protocols that never caught on. Corporate projects that got canceled. Each one left a port number behind—a forwarding address to an empty building.
These ports don't hurt anything. They just sit there, reserved but unused, a monument to things that didn't last.
How to Check What's Using Port 1354
Even though the official service is gone, something on your system might be using port 1354. Here's how to check:
On Linux or macOS:
On Windows:
If nothing returns, the port is quiet. If something does, you've found either a legitimate application that happens to use this port, or something you should investigate further.
The Registered Ports Range
Port 1354 belongs to the registered ports range (1024-49151), which contains:
- Legitimate services that never became widely known
- Proprietary protocols used internally by companies
- Dead services like Five Across XSIP Network
- Ports awaiting assignment to future services
Unlike well-known ports (0-1023) which are tightly controlled and documented, the registered range is a mixed landscape. Some ports are actively used by major services. Others, like 1354, are archaeological artifacts.
Security Note
Because port 1354 has no active legitimate service, finding it open on a system is unusual and worth investigating. Malware sometimes uses obscure registered ports precisely because they're unlikely to be monitored.
If you see unexpected traffic on port 1354, don't assume it's "Five Across XSIP Network" coming back from the dead. Check what's actually using it.
Frequently Asked Questions
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