What Port 1826 Is
Port 1826 sits in the registered port range (1024-49151). These ports are documented with IANA, meaning a person or organization formally claimed them for a specific purpose. Port 1826 was registered as ARDT — by a contact at ardent.com.au.
That domain no longer exists.
The IANA entry is technically complete: service name, TCP and UDP registration, assignee name (Mike Goddard), contact email. It has the form of something real. But whatever ARDT was — a product, a protocol, an internal tool that someone thought would matter — it left no trace behind. No RFC, no documentation, no known implementations.
The registration is a ghost: official, pointing at nothing.
The Glacier Problem
Port 1826 appears in security databases for a different reason entirely. The Glacier trojan — a remote access tool from the late 1990s targeting Windows systems — used port 1826 as part of its command-and-control infrastructure.1
Glacier was a Chinese-origin RAT (Remote Access Trojan) that allowed attackers to control infected machines remotely. Like most trojans of that era, it picked obscure port numbers to avoid detection. Port 1826 was one of them.
This association lingers in firewall blocklists and port scanners. If you see unexpected traffic on port 1826, the historical context is worth knowing — though modern malware rarely reuses 1990s port assignments.
What the Registered Range Means
Ports 1024-49151 are registered ports. Unlike well-known ports (0-1023), they don't require root/administrator access to use, and unlike ephemeral ports (49152-65535), they're meant to be stable addresses for named services.
Registration is voluntary and permanent. IANA doesn't revoke assignments when companies disappear, so the registry accumulates entries like this one — a name, a vanished domain, and nothing else.
Checking What's on Port 1826
If you see activity on port 1826 and want to know the source:
On Linux/macOS:
On Windows:
The process ID in the output can be matched against Task Manager or tasklist to identify what's listening.
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