What This Port Is
Port 3214 is registered with IANA under the name jmq-daemon-1 — "JMQ Daemon Port 1" — for both TCP and UDP. It belongs to Sun Microsystems' Java Message Queue (JMQ), a messaging middleware system that implemented the Java Message Service (JMS) standard.1
If you expected this page to say "unassigned," you're not alone. Most port-scanning tools and security databases treat port 3214 as obscure or unknown. The registration is real, but the software that owns it has faded far enough into history that the assignment is effectively inert.
The Registered Port Range
Port 3214 sits in the registered port range: 1024–49151. These ports are not reserved by the operating system (unlike well-known ports 0–1023, which require root/administrator privileges to bind). Any application can use them, but IANA maintains a registry of formal assignments to prevent collisions.
A registered port assignment means: "This organization filed paperwork saying they use this port for this purpose." It does not mean the software is widely deployed, actively maintained, or that the port is occupied on any given machine.
What JMQ Was
Sun Microsystems built JMQ as their implementation of the JMS specification — a Java API standard for sending messages between distributed applications, supporting both publish/subscribe topics and point-to-point queues. JMQ shipped as part of the Sun Java System suite and was later open-sourced as OpenMQ under Oracle's stewardship after Oracle acquired Sun in 2010.2
The primary JMQ broker port is 7676 — that's where clients connect. Ports 3214 and 3215 (jmq-daemon-1 and jmq-daemon-2) were registered for internal daemon processes. In modern OpenMQ deployments, you're unlikely to see 3214 in use; current versions use a port mapper approach to dynamically assign service ports from 7676.3
Is Anything Listening on This Port?
Probably not — unless you're running a very old JMQ deployment. To check on your own system:
Linux / macOS:
Windows:
If something shows up and you're not running JMQ, check the process ID — it's an application that chose this port informally, which is common in the registered range.
Why Registered-but-Obscure Ports Matter
The registered range contains thousands of assignments like this one: technically claimed, practically abandoned. They're a record of software ecosystems that rose and fell — middleware vendors, enterprise Java tooling, early 2000s Sun Microsystems products. The IANA registry doesn't expire entries when companies are acquired or software is discontinued.
This matters for security: port 3214 appearing open on a server is almost certainly not JMQ. It's either a misconfiguration, a development tool, or something worth investigating.
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