Port 1323 exists in two worlds. Officially, it belongs to Brocade Communications. Culturally, it belongs to Go developers learning web frameworks.
What Port 1323 Does
Port 1323 is officially assigned to brcd—a service related to Brocade Communications Systems networking equipment.12 The name likely stands for "Brocade," the company that specialized in data center networking solutions and Fibre Channel storage networks.
The service was designed for communication with Brocade switches and networking equipment, often using Telnet-based protocols.3
But that's the official story. The real story is messier and more interesting.
The Unofficial Life of Port 1323
If you search for "port 1323" today, you won't find much about Brocade. You'll find thousands of tutorials, Stack Overflow questions, and GitHub repositories using port 1323 for one reason: Echo.4
Echo is a high-performance, minimalist web framework for Go. And in every tutorial, every example, every getting-started guide, you see the same line:
Port 1323 became the framework's conventional example port. Not because of any technical significance. Not because it was registered for HTTP. Just because the documentation needed a port number and 1323 worked.5
Over time, this created a curious situation: the port officially assigned to Brocade networking equipment is now far more commonly used by developers running test servers on their laptops.
Why This Happens
Port 1323 sits in the registered port range (1024-49151). These ports are assigned by IANA to specific services, but the assignments aren't enforced. Any application can listen on any registered port. It's a registry, not a reservation system.
So when Echo's creators picked 1323 for their examples, nothing stopped them. And when thousands of developers copied those examples, nothing stopped them either.
The result: a port with an official purpose that almost no one uses, and an unofficial purpose that everyone recognizes.
What Range This Port Belongs To
Port 1323 is a registered port. The port number space is divided into three ranges:
- Well-known ports (0-1023): Reserved for system services, require root privileges to bind
- Registered ports (1024-49151): Assigned by IANA for specific services, but not enforced
- Dynamic/ephemeral ports (49152-65535): Used for temporary connections, never assigned
Registered ports like 1323 are meant to prevent conflicts—if everyone knows 1323 is for Brocade, they'll avoid it. But in practice, the assignment only matters if you're actually running that service. Development servers don't care about official assignments.
How to Check What's Listening on Port 1323
If you suspect something is using port 1323 on your system:
On Linux/macOS:
On Windows:
You'll likely find nothing, or a development server you started and forgot about.
Why Unassigned (and Underused) Ports Matter
Ports like 1323 reveal something important about how the Internet actually works: official assignments are guidelines, not rules.
IANA maintains the registry to help avoid conflicts. If you're building production software that needs a port, you should check the registry and either use your assigned port or pick one that's unassigned. But for local development, testing, or internal tools, developers pick whatever works.
This creates a shadow ecosystem: ports with official assignments that are functionally unassigned because no one uses them, and ports with no assignment that become de facto standards through common use.
Port 1323 is both. Officially Brocade. Unofficially Echo. Really, just another number between 1024 and 49151 that different communities use for different things.
The Practical Reality
If you're running a Brocade switch and it needs port 1323, use it. If you're learning Echo and the tutorial says :1323, use it. If you need a port for local testing and 1323 is available, use it.
The registry exists to help, not to restrict. The point is to avoid stepping on each other's toes when it matters—in production, on public networks, where conflicts cause real problems. For everything else, the port is just a number.
And 1323 is a number that Brocade claimed first, but developers borrowed second, and both groups use when they need to.
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