Port 20018 has no official service assigned by IANA. It sits in the registered port range (1024-49151), where applications can claim ports for specific purposes without formal Internet-wide standardization.
What the Registered Range Means
The Internet's 65,535 ports are divided into three ranges:
- Well-known ports (0-1023): Reserved for standard services like HTTP, SSH, DNS. Requires special privileges to bind on Unix systems.
- Registered ports (1024-49151): Available for applications to register with IANA, but registration is optional. Port 20018 lives here.
- Dynamic/ephemeral ports (49152-65535): Temporary ports assigned by operating systems for client connections.
Registered ports exist in a middle ground. Organizations can register them with IANA to avoid conflicts, but many applications just pick a port and use it without formal registration. This works fine within private networks or for specialized software.
Known Unofficial Use: FileWave
The most documented use of port 20018 is in FileWave, a mobile device management (MDM) and enterprise software deployment platform.1
FileWave uses port 20018 for SSL-encrypted communication between Booster components. When you configure FileWave's primary port 20013, it automatically sets up ports 20014 and 20018 (using a port + 5 pattern) for secure Booster-to-Booster communication.1
What's a Booster? In FileWave's architecture, Boosters are distribution servers that help deploy software and updates across large networks. They talk to each other on port 20018 using encrypted connections.
This is a perfect example of how unassigned ports get used: FileWave needed ports for its internal communication, chose ones in the registered range that weren't taken, and documented them for customers who need to configure firewalls.
Checking What's Listening
On Linux or macOS:
On Windows:
If you see port 20018 open on your network and you're not running FileWave, it could be:
- Another application using this port for custom purposes
- Malware (always investigate unexpected listening ports)
- A misconfigured service
Why Unassigned Ports Matter
Unassigned ports like 20018 aren't useless space—they're possibility. They give applications room to grow without stepping on standard services. FileWave didn't need IANA's permission to use port 20018; they just needed a port that wouldn't conflict with essential Internet protocols.
This flexibility is part of the Internet's design. Not everything needs to be standardized. Some things just need to work within their own context.
Port 20018 is quiet, unassigned space. Until FileWave shows up, or until your application decides it needs a home. Then it becomes exactly what you need it to be.
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