Port 1156 is officially registered with IANA for iasControl OMS (Oracle Management Service), part of Oracle Application Server's control infrastructure. Both TCP and UDP protocols use this port.1
What is iasControl OMS?
iasControl OMS is Oracle's management service component within Oracle Application Server (iAS). It's part of the control plane that monitors and administers application server instances—the behind-the-scenes infrastructure that keeps Oracle's application servers running.2
The Oracle Management Service works alongside the Oracle Management Agent and Oracle Management Repository to gather, organize, and route management data. Port 1156 is one of the communication channels in this architecture.3
The registered port range
Port 1156 sits in the registered port range (1024-49151). These ports are assigned by IANA to specific applications and services. Companies can request registration for their software's ports, which is exactly what Oracle did for their Application Server management tools.
Unlike well-known ports (0-1023) which require root privileges, registered ports can be used by regular user processes. This makes them suitable for application-level services like Oracle's management infrastructure.
When you'll encounter this port
You'll only see port 1156 in use if you're running Oracle Application Server and its management components. It's not a port that general Internet traffic touches—it's internal infrastructure.
If you're managing Oracle Application Server instances through the Application Server Control Console (the web-based management interface), port 1156 might be one of the channels handling communication between management components.4
Related ports
Port 1157 is registered for iascontrol (Oracle iASControl), working alongside port 1156 as part of Oracle's Application Server management suite.5
These ports are siblings—both serving Oracle's management infrastructure, both sitting in the registered range, both invisible to most people who use Oracle-based applications.
Checking what's listening
On Linux or macOS:
On Windows:
If nothing returns, the port isn't in use. If you see Oracle processes listening, you're running Oracle Application Server management components.
Why registered ports matter
Port 1156 represents how the Internet's port system works for enterprise software. Oracle needed reliable port numbers for their management infrastructure—ports that wouldn't conflict with other services. They registered 1156 and 1157 with IANA, creating a permanent reservation.
This prevents two applications from accidentally claiming the same port. When you install Oracle Application Server, it can confidently bind to port 1156 because that number is officially assigned.
Most registered ports sit unused on most machines. They're specific to particular software. But on the machines where that software runs, these ports are essential—the defined channels that make communication predictable and conflict-free.
Security considerations
If you're not running Oracle Application Server, port 1156 should not be open or listening. If you discover unexpected traffic on this port, investigate—it could indicate unauthorized Oracle software installation or port misuse.
For systems running legitimate Oracle Application Server instances, ensure proper firewall rules restrict access to port 1156 to authorized management systems only. This port is part of your control plane and should not be exposed to untrusted networks.
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