What This Port Is
Port 3405 sits in the registered ports range (1024–49151), the middle tier of the port number system. These ports aren't claimed by the core protocols that built the Internet — those live below 1024 — but they're not the ephemeral, dynamically assigned ports that your operating system hands out on the fly either. They're named. They're supposed to mean something specific.
IANA's registry lists port 3405 as nokia-ann-ch1 — Nokia Announcement ch 1 — assigned on both TCP and UDP.1
That's where the documentation ends.
What Nokia Announcement ch 1 Actually Is
Unclear. Almost nothing is publicly documented about this protocol.
The name suggests it was part of a suite of announcement channels — Nokia also registered adjacent ports in the same range — likely used by Nokia's network equipment to broadcast state information, service availability, or topology changes to other nodes. The kind of quiet, internal chatter that telecommunications equipment uses to know what else is alive on the network.
Whether it ran over Nokia's routers, their network management systems, or something else entirely: unknown. Whether it's still in active use anywhere: almost certainly not at scale, given that it leaves no fingerprint in any public troubleshooting database, security advisory, or network capture archive.
The registration is a fossil. The protocol may still breathe somewhere inside Nokia's infrastructure, but it never became something the broader Internet needed to know about.
The Registered Port Range
The registered range (1024–49151) is where the Internet's long tail lives. IANA maintains registrations here, but the bar for registration has historically been low — a company submits a request, describes a service, and gets a port number. No RFC required. No public protocol specification required.
The result: thousands of registered ports like this one. Named. Technically claimed. Practically invisible. They're a snapshot of protocols that mattered to specific vendors at specific moments — internal tools, proprietary management planes, equipment-to-equipment handshakes that worked fine without anyone outside the company needing to understand them.
Port 3405 is not unusual for this range. It's typical.
If You See This Port
If port 3405 appears in your network traffic or firewall logs, it's almost certainly not Nokia Announcement ch 1. It's more likely:
- An application that chose this port arbitrarily
- A misconfigured service
- A port scan hitting the range
- Something deliberately obscure using an unmonitored port
The IANA assignment provides no security context here. No CVEs are associated with this port, no known malware uses it as a command-and-control channel, and no exploit toolkits specifically target it. It's not dangerous — it's just a number.
How to Check What's Listening
To see if anything is actually running on port 3405 on your machine:
macOS / Linux:
or
Windows:
If nothing returns, nothing is listening. That's the most likely result.
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