Port 23564 has no official assignment. It sits in the registered port range, unclaimed and unused.
What Range This Port Belongs To
Port 23564 falls within the registered ports range (1024-49151). These ports are assigned by the Internet Assigned Numbers Authority (IANA) to specific services upon application. Anyone can request a port number in this range for their protocol or service.
But port 23564 hasn't been claimed. It belongs to an unassigned block spanning ports 23547-23999.1
Why Some Ports Stay Empty
Of the 65,535 available port numbers, most are unassigned. The Internet doesn't need tens of thousands of different protocols. The well-known ports (0-1023) handle the fundamental services: HTTP, HTTPS, SSH, DNS, email. The registered range contains ports for less common protocols—many specialized, some obsolete, many never claimed at all.
Port 23564 is one of the empty ones. No RFC defines a protocol for it. No company has registered it. No service runs on it by default.
What Could Be Using This Port
Just because a port is unassigned doesn't mean nothing ever uses it. Any application can listen on any port. You might find something on port 23564 if:
- A developer chose it for a custom application
- An internal service at your company uses it
- Malware picked a random high port number
- A game or P2P application bound to it
To check what's listening on port 23564 on your system:
Linux/macOS:
Windows:
If nothing returns, nothing is listening. The port is closed, as it is on most systems.
Why Unassigned Ports Matter
The existence of unassigned ports is a feature, not a gap. They represent capacity. When someone creates a new protocol or service that needs a permanent port number, IANA has thousands of available addresses to assign.
Port 23564 is waiting. Like most ports, it probably always will be. The Internet doesn't need it yet. Maybe it never will. But the space exists, reserved in the architecture, ready if the day comes when someone builds something that needs a door here.
Related Ports
Port 23564 sits in an unassigned block. Its neighbors are equally empty:
- Ports 23547-23999: Unassigned range containing port 23564
- Port 23546: Last assigned port before this range (Rdeck Audio)
- Port 24000: Next assigned port after this range (med-supp)
Frequently Asked Questions
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