Port 2355 has no officially assigned service. IANA's registry, the authoritative record of which protocol owns which number, lists it as unassigned. 1
The Range It Belongs To
Port 2355 sits in the registered ports range (1024–49151). This range is the middle ground of the port system:
- Well-known ports (0–1023) are reserved for foundational protocols — HTTP, HTTPS, SSH, DNS. You need elevated privileges to listen on them.
- Registered ports (1024–49151) are for applications that registered their assignment with IANA. Anyone can listen on these without special permissions, and organizations can formally claim a number for their software.
- Dynamic/ephemeral ports (49152–65535) are the throwaway range — your OS grabs one temporarily when your browser makes an outbound connection.
Port 2355 is registered but unclaimed. It's available real estate in a numbered system that's largely been spoken for.
A Note on Port Lore
Several port databases list 2355 as belonging to "JADE" — the Java Agent DEvelopment Framework, a multi-agent platform that emerged from research labs in the early 2000s. 2 But JADE's documented default ports are 1099 (for its RMI registry) and 7778, not 2355. The 2355 association appears to have spread through port database sites copying each other rather than from any authoritative source. This is worth knowing: port databases are frequently wrong in exactly this way. One site guesses, others repeat it, and an unassigned port acquires a fictional biography.
If you're seeing traffic on port 2355 in your environment, it's almost certainly something local — a service that needed a number and picked one nobody was using.
What's Actually Listening on Port 2355
To check what's using this port on your system:
macOS/Linux:
Linux (alternative):
Windows:
If nothing comes back, nothing is listening. If something does, the process name will tell you what claimed it.
Why Unassigned Ports Exist
The port system has 65,535 numbers. Fewer than 1,500 are officially assigned. The rest exist as a commons — available to any application that needs a stable address, no registration required.
Most servers pick their ports through a combination of convention, configuration, and "this one wasn't taken when we needed it." Port 2355 is in that population: unremarkable by design, available by default, useful precisely because nobody owns it.
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