Port 1827: ASI — Registered, but Practically Unknown

Port 1827 sits in the registered port range (1024–49151), which means it went through IANA's formal process: someone submitted a request, provided a contact, and received an official assignment. The service name on record is ASI.

What ASI actually does? Almost no documentation exists. The contact listed in the IANA registry is Bob Tournoux, but no RFC, no product page, and no developer community discussion appears to explain the protocol. The port is claimed on paper and orphaned in practice.¹

The Registered Port Range

Ports 1024 through 49151 are assigned by IANA for specific services and applications, but they require no kernel privileges to open — any software running as a normal user can bind to them. Unlike well-known ports (0–1023), registered ports aren't tightly controlled after assignment. A company or developer requests a number, gets it, and may never publish meaningful documentation.

This is common. Thousands of registered ports have thin or zero documentation. The number is reserved; the world moved on.

Known Unofficial Uses

Beyond the IANA assignment, port 1827 has been documented in one concrete context:

Platinum Policy Compliance Manager (PCM) 7.0 — an enterprise security compliance tool — used port 1827 for its agent communication. Security researchers documented a buffer overflow vulnerability in this software affecting that port, which means network scanners and security databases picked it up.²

This is the most substantiated real-world use of port 1827: compliance software that is itself now largely retired.

Checking What's on This Port

If you see traffic on port 1827 and want to know what's using it:

On Linux or macOS:

# Show process listening on port 1827
sudo ss -tlnp sport = :1827

# Or with lsof
sudo lsof -i :1827

On Windows:

# Show what's listening on port 1827
netstat -ano | findstr :1827

# Then look up the PID
tasklist | findstr <PID>

If nothing is listening, you're looking at a closed port — normal for the vast majority of registered ports on any given machine.

Why Unassigned Ports Matter

The port space isn't infinitely flexible. IANA manages 65,535 port numbers across three ranges. When ports are registered and then abandoned, they create noise: security scanners flag them, firewall rules get written for them, and network administrators have to decide whether to block them without knowing why they exist.

Port 1827 is a small example of a larger reality: the registered port range contains hundreds of similar quiet corners — numbers with names, without stories, waiting for traffic that mostly never comes.