Port 1325 sits in the registered ports range—officially assigned, but far from famous. It belongs to DX-Instrument, a protocol associated with Yokogawa's industrial data acquisition systems.1
What DX-Instrument Does
DX-Instrument is the network communication protocol for Yokogawa's DAQSTATION series—industrial recorders that monitor temperature, pressure, flow rates, and other process variables in factories, refineries, and industrial facilities.2
These aren't consumer devices. They're the instruments that sit in control rooms and on factory floors, collecting data from sensors, recording trends, and sending alerts when processes drift out of range. When a paper mill needs to monitor pulp temperature across 30 points, or a chemical plant tracks pressure in real-time, these are the systems doing that work.
Port 1325 is how these instruments communicate across networks—sending measurement data, receiving configuration commands, and enabling remote monitoring.3
The Registered Ports Range
Port 1325 belongs to the registered ports range (1024-49151). These ports are assigned by IANA to specific services upon request, but they don't have the same universal recognition as well-known ports (0-1023).
This is the middle tier of the port numbering system:
- Well-known ports (0-1023): HTTP, HTTPS, SSH, DNS—the protocols everyone uses
- Registered ports (1024-49151): Specific applications and vendor protocols—official but specialized
- Dynamic/ephemeral ports (49152-65535): Temporary assignments for client connections
Most registered ports are like port 1325: claimed by a specific vendor or protocol, documented in the IANA registry, but known primarily to the people who actually use those systems.
Why You Might See Port 1325
If you see port 1325 active on your network, it likely means:
- You have Yokogawa data acquisition equipment installed
- Industrial monitoring software is communicating with DAQSTATION recorders
- Someone is accessing or configuring industrial measurement instruments remotely
This isn't a port that consumer devices use. If you see it and you're not in an industrial environment, it's worth investigating—though it's more likely a specialized application than a security concern.
Checking What's Using Port 1325
To see what's actually listening on port 1325 on your system:
On Linux or macOS:
On Windows:
This will show you the process ID and program name using the port. If it's DX-Instrument, you'll see references to Yokogawa software or DAQSTATION communication services.
The Quiet Majority
Port 1325 represents the vast majority of registered ports: not famous, not widely used, but essential to specific industries and applications. The Internet isn't just web browsers and email. It's industrial control systems, scientific instruments, specialized databases, and thousands of other services that operate quietly in the background.
Most people will never need port 1325. But in the facilities that do—where monitoring and control are measured in milliseconds and failed sensors mean shutdowns—this port is part of the infrastructure that keeps processes running.
Related Ports
Port 1325 operates alongside other industrial and data acquisition protocols:
- Port 502: Modbus (another industrial automation protocol Yokogawa systems support)
- Port 102: ISO-TSAP (industrial communication)
- Port 2222: EtherNet/IP (industrial Ethernet protocol)
- Port 44818: EtherNet/IP explicit messaging
Many industrial data acquisition systems support multiple protocols, and you'll often see several of these ports active in environments running DAQSTATION or similar equipment.
Frequently Asked Questions About Port 1325
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