What Port 3206 Is
Port 3206 sits in the registered port range (1024–49151) — the middle tier of the port numbering system, between the privileged well-known ports (0–1023) and the ephemeral ports your OS hands out on demand (49152–65535).
IANA, the authority that manages port assignments, lists port 3206 as unassigned. No protocol. No service. No official owner.
But some port databases remember it differently.
The IronMail Connection
Several port databases — including SpeedGuide — attribute port 3206 to IronMail POP Proxy, a component of CipherTrust's IronMail email security appliance.1
CipherTrust launched IronMail in 2002 as one of the first dedicated email security appliances.2 It sat on the network perimeter, between the firewall and the corporate email server, acting as a filtering gateway. It scanned for spam, viruses, and policy violations before mail ever reached Exchange or Notes. As part of that role, it proxied POP3 traffic — and port 3206 was apparently where that proxy listened.
The product was never obscure exactly, but it also never escaped a particular era of network security. In 2006, Secure Computing acquired CipherTrust.3 In 2008, McAfee acquired Secure Computing. The IronMail product line dissolved into larger platforms and eventually stopped being sold as a standalone product.
Port 3206 was never formally registered with IANA. It lived in the space between official assignment and practical use — a port that a real product used, on real networks, but never claimed officially. When the product died, the port returned to the pool of unassigned numbers, carrying nothing but the memory of its former purpose.
What You'll Find Here Today
If you see traffic on port 3206, it is almost certainly not IronMail — that product is extinct. More likely explanations:
- A custom application that happened to choose this port
- Misconfigured software
- Ephemeral port overlap (less common at this number, but possible)
- A port scanner or probe
How to Check What's Listening
On Linux/macOS:
On Windows:
To identify the process by PID (Windows):
If something is listening on 3206 and you don't recognize it, that's worth investigating. Unassigned ports with active listeners are either legitimate custom software or something you should know about.
Why Unassigned Ports Matter
The registered port range has 48,128 slots. Most of them are unassigned. This isn't wasted space — it's the overflow valve for the Internet's constant evolution. When a developer needs a port for a new service, they pick from the unassigned pool, use it informally, and may eventually request IANA registration if the service becomes widely deployed.
Port 3206's story is a reminder that this process isn't always clean. Products use ports. Products die. The ports outlast them, unclaimed, carrying traces of purposes they no longer serve.
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