What This Port Is
Port 1947 sits in the registered port range (1024–49151). IANA has no official service assigned here. But "unassigned" doesn't mean unused.
In practice, port 1947 belongs to Sentinel HASP (formerly Aladdin HASP, later SafeNet, now Thales), a hardware-based software licensing system used by thousands of commercial applications worldwide.1
What Actually Runs Here
HASP stands for Hardware Against Software Piracy. The system works like this: a vendor ships their software with a USB dongle (the hardware key). When the software starts, it contacts the HASP License Manager running on your machine — or on a license server across the network — to verify the dongle is present and the license is valid. Without that confirmation, the software refuses to run.
Port 1947 is the address of that conversation.
The protocol uses both TCP and UDP:
- UDP 1947: Broadcast discovery. The client shouts "is there a license server out there?" and listens for responses.
- TCP 1947: Once a server is found, all actual license communication moves here.2
The software has changed names several times as the company was acquired — Aladdin Knowledge Systems → SafeNet → Gemalto → Thales — but port 1947 stayed constant through every rebrand.3
Who Uses This Port
If you've ever run:
- CATIA, SolidWorks, or other CAD/CAM packages
- Finite element analysis software (ANSYS, Abaqus)
- FARO measurement and scanning tools
- Industrial control or simulation software
- Older Adobe products or specialty engineering applications
...you've communicated over port 1947. It's common on corporate networks, engineering workstations, and any environment where expensive specialized software is licensed per-seat.
Checking What's on This Port
To see if something is listening on port 1947 on your machine:
macOS / Linux:
Windows:
If you see hasplms.exe or hasplmd in the results, that's the Sentinel license manager. It's expected. If you see something else — especially something you don't recognize — that's worth investigating.
Why Unassigned Ports Matter
The registered port range exists so vendors can stake out territory without collision. IANA assigns ports formally, but registration requires paperwork and fees. Many vendors simply pick a number, use it consistently across their products, and let de facto standard do the work that IANA registration would have done officially.
Port 1947 is a clean example of this: Aladdin chose it, never registered it, and it became the permanent home of their licensing infrastructure because the alternative — changing the port in every product, every firewall rule, every network configuration worldwide — was unthinkable.
The port is now so associated with Sentinel HASP that network administrators simply open 1947 when deploying license servers. The IANA registry says "unassigned." The real world says otherwise.
Frequently Asked Questions
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