What Port 2756 Is
Port 2756 sits in the registered port range (1024–49151). These ports are assigned by IANA to specific services and applications—in contrast to the well-known ports (0–1023) that require more rigorous justification, registered ports are available to any organization that files a request.
IANA's registry lists port 2756 as assigned to a service called simplement-tie, registered for both TCP and UDP, with a contact name of Tzvika Chumash.1 That's where the public record ends. There is no RFC, no open-source implementation, no documentation anyone can find. The name suggests a connection to a company called Simplement, but no publicly available software or protocol specification has surfaced to confirm what simplement-tie actually does or did.
This happens more than you'd expect. Someone registers a port for an internal tool, a product that never shipped, or a service that quietly went away. The IANA entry remains indefinitely. The port sits unclaimed in practice.
What the Registered Range Means
The registered range exists because the well-known ports (0–1023) aren't enough. Applications need stable, predictable port numbers too—especially commercial and enterprise software that needs to survive firewalls and network configuration.
The process is lightweight: submit a request to IANA, provide a contact, give the service a name. No working implementation required. This is by design. It lets organizations reserve a port before a product ships. It also means the registry contains many entries like port 2756: technically assigned, practically empty.2
Is Anything Actually Running on This Port?
Possibly, but not anything standardized. If you see traffic on port 2756 on your network, it's either:
- Leftover simplement-tie software (if it ever existed publicly)
- An application that picked this port opportunistically
- Scanning traffic probing for open services
To check what's listening on this port on your own machine:
macOS / Linux:
Windows:
If something shows up and you don't recognize it, cross-reference the process ID with your running applications. An unknown process listening on an obscure registered port is worth investigating.
Why Unassigned-in-Practice Ports Matter
Port 2756 illustrates something real about the port system: the registry and reality don't perfectly overlap. IANA manages the namespace, but it can't enforce usage. Ports get registered and abandoned. Services grow and consume ports that were never formally registered. Malware occasionally squats on registered-but-unused ports precisely because they look innocuous in logs.
The registered range is a coordination mechanism, not a guarantee. Its value is preventing two popular applications from accidentally colliding on the same port number—not maintaining a perfect inventory of what's actually in use.
Related Ports
- Port 2700–2704 — Registered to KnowShowGo P2P, another mostly-forgotten P2P application from the same era3
- Port 2757 — Also unassigned
- Port 2755 — Also unassigned
Frequently Asked Questions
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