Port 1134 is registered to APLX (MicroAPL APLX), an object-oriented implementation of the APL programming language. Both TCP and UDP protocols can use this port.1
This is a port with a story that has an ending. The software that once used it no longer exists in commercial form.
What is APLX?
APLX was a cross-platform dialect of APL—a programming language known for its mathematical notation and array-processing capabilities. Released by British company MicroAPL in 2002, APLX was built on APL2 with extensions for object-oriented programming.2
The language was designed for financial planning, market research, statistics, management information, and scientific and engineering work. It ran on Windows, macOS, and Linux, making it one of the more portable APL implementations of its time.3
The Port's Purpose
Like many programming languages and development environments, APLX needed network communication capabilities. Port 1134 was registered for APLX's TCP/IP socket communication, allowing APLX programs to send and receive data over networks.4
In APLX, developers would set the port property on a Socket object before calling connection methods. This port became the doorway through which APLX applications could communicate with other systems.
The End of Active Development
On July 11, 2016, MicroAPL withdrew APLX from commercial sale. The language is no longer in active development. Dyalog Ltd., creators of another APL dialect, now hosts an APLX archive where the final version (5.0) can be downloaded free of charge on an "as-is" basis.5
This makes port 1134 somewhat unusual—it's a registered port for software that no longer has commercial support or active development.
What This Port Represents
Port 1134 is a memorial of sorts. The IANA registry doesn't delete port assignments when software is discontinued. The registration remains, even though the software that needed it has stopped evolving.
You're unlikely to find APLX running on modern systems. If you scan a network and find port 1134 open, it's either:
- A legacy APLX installation still in use
- Something else that happens to be using this registered but largely inactive port
- Worth investigating, because unexpected open ports can signal unauthorized services
How to Check Port 1134
To see if anything is listening on port 1134 on your system:
On Linux or macOS:
On Windows:
If something is listening and you don't recognize it, investigate. This port shouldn't be in active use on most systems.
The Registry Range
Port 1134 falls in the registered ports range (1024–49151). These ports are assigned by IANA to specific services upon application, but they're not as universally standardized as well-known ports (0–1023). Applications can use them, but the assignments are more like reservations than requirements.6
This is why a discontinued application's port remains in the registry. It was reserved, assigned, and that assignment persists even when the software doesn't.
Frequently Asked Questions
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