Port 1231 is officially assigned to menandmice-lpm (Men & Mice License Port Manager), a component of Micetro—a DNS, DHCP, and IPAM (IP Address Management) orchestration platform now owned by BlueCat Networks.1
This port handles license verification for software that manages network infrastructure. When a network administrator opens Micetro to manage thousands of IP addresses, DNS records, or DHCP leases, port 1231 is how the software confirms they're licensed to do so.
What Is Micetro?
Micetro is a DDI (DNS, DHCP, IPAM) orchestration solution that centralizes network management across multiple vendors and environments. Instead of replacing existing DNS or DHCP servers, it overlays them—managing Microsoft DNS, BIND, Kea, AWS Route 53, Azure DNS, and others from a single interface.2
The company behind it, Men & Mice, has been building DNS and IPAM tools since the late 1990s. They registered port 1231 with IANA for their license management system—the part that tracks which features a customer has paid for and ensures license compliance across their deployment.
How License Management Works
Enterprise software typically requires license verification to function. The license manager (LPM—License Port Manager) communicates over port 1231 to:
- Verify that a valid license key exists
- Check which modules are enabled (DNS, DHCP, IPAM)
- Track the number of licensed users or managed objects
- Enforce license limits
Without access to port 1231, the software might run in a limited mode or refuse to start certain modules. Network administrators need to ensure this port is open between the Micetro client and the license server.
The Registered Ports Range
Port 1231 sits in the registered ports range (1024-49151). These ports are assigned by IANA to specific applications or services upon request. Unlike well-known ports (0-1023), which require root privileges and carry foundational Internet protocols, registered ports are for user-level applications.
This is exactly what the registered range was designed for: a company builds enterprise software, needs a predictable port for a specific service, and registers it with IANA. Port 1231 became the official home for Men & Mice's license manager.
Why This Matters
Port 1231 represents something important about how enterprise software works: even tools that manage infrastructure need their own infrastructure. A license manager is software managing software—verification happening in the background so administrators can do their actual job.
And this port has been doing that quietly for years. Every time a network engineer at a hospital, university, or ISP opens Micetro to update DNS records or allocate IP addresses, port 1231 confirms they're allowed to. It's infrastructure managing infrastructure, all the way down.
Security Considerations
License management ports are typically used only within an organization's internal network. Port 1231 should not be exposed to the public Internet—there's no reason for external systems to communicate with your license server.
If you're running Micetro, ensure:
- Port 1231 is open between clients and the license server internally
- Firewall rules block external access to this port
- License server access is restricted to authorized administrators
Checking What's Listening
To see if anything is listening on port 1231 on your system:
Linux/macOS:
Windows:
If you're running Micetro, you should see the license manager service. If you're not and something is listening, investigate—it could be another application unofficially using this port.
Related Ports
Micetro uses several other ports for its complete operation:
- Port 1337: Men & Mice Central (the core management service)
- Port 80/443: Web interface for the Micetro management console
- Port 53: DNS services being managed
- Port 67/68: DHCP services being managed
Port 1231 is specifically for license verification, while these others handle the actual network management work.
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