Port 3006: Unassigned — Unclaimed Land in Registered Space

What Range This Port Belongs To

Port 3006 sits in the registered port range (1024–49151). This range is where IANA maintains an official registry of port-to-service assignments — but registration is voluntary, incomplete, and increasingly historical. Many ports in this range were claimed decades ago; many were never claimed at all.

Port 3006 was never officially assigned to any service. IANA's registry lists it as unassigned.¹

Known Unofficial Uses

Miralix SMS Client Connector

The most commonly cited use is the Miralix SMS Client Connector, a component of Miralix's call center and unified communications software. It uses port 3006 TCP to bridge client applications with SMS gateways — letting call center platforms send and receive text messages as part of business workflows. This is a niche enterprise product, not something you're likely to encounter outside that specific software stack.²

Instant Internet Admin

Some sources list port 3006 as historically associated with "Instant Internet Admin," a now-obscure connection management tool. This association appears in older port databases but has little practical relevance today.

Clandestine (malware)

Port 3006 has appeared in threat databases as a port used by "Clandestine," a remote access trojan. This doesn't make the port inherently dangerous — any port can be used by malware — but it does mean security scanners may flag unexpected activity here.³

How to Check What's Listening on Port 3006

If you see traffic on port 3006 and want to know what's using it:

On macOS or Linux:

sudo lsof -i :3006

On Windows:

netstat -ano | findstr :3006

Then match the PID to a process in Task Manager or with:

tasklist | findstr <PID>

If something unexpected is listening on this port, that's worth investigating.

Why Unassigned Ports Matter

The registered port range exists to reduce collisions — if everyone knows MySQL uses 3306, applications can find each other without negotiation. But the registry has gaps. Port 3006 is one of them.

Unassigned ports aren't problems on their own. They become problems when two applications on the same machine independently decide to use the same one, or when something unexpected is listening and you don't know why. That's why knowing your open ports matters more than knowing the registry.