Port 2824: CQG Net/LAN 1 — Registered, Rarely Seen

What This Port Is

Port 2824 sits in the registered port range (1024–49151) — the middle tier of the port numbering system, managed by IANA. These ports are assigned to specific services on request, distinguishing them from the well-known ports below 1024 (which carry foundational Internet protocols) and the ephemeral ports above 49151 (which operating systems assign dynamically to outgoing connections).

IANA lists port 2824 as CQG Net/LAN 1, registered to CQG, Inc.¹ CQG is a financial technology company whose platform powers futures and derivatives trading for brokers and professional traders worldwide.

The Honest Picture

Port 2823 is CQG's documented primary port — their published technical specifications require it for order routing and real-time market data between client and server.² Port 2824 is registered right beside it, labeled "Net/LAN 1," but CQG's own documentation doesn't reference it.

This happens. A company registers a block of adjacent ports during the initial filing process, anticipates multiple services, and the secondary registration quietly goes unused — or gets absorbed into the primary port's traffic, or was relevant to an older architecture that's since been retired. The registration persists in IANA's database regardless.

There are no known security advisories, malware associations, or community-documented applications tied to port 2824.

What Range Tells You

When you see an unknown port in the registered range, three things are usually true:

• Something legitimate was supposed to run there
• A database somewhere knows what it is
• What's actually running might be completely different

Registered ports carry no enforcement. Any application can listen on any registered port. The assignment is a courtesy — a coordination mechanism to reduce collision — not a guarantee of what you'll find.

How to Check What's Listening

If you see traffic on port 2824 on your system or network:

On Linux/macOS:

# See what process is using port 2824
ss -tlnp sport = :2824
# or
lsof -i :2824

On Windows:

netstat -ano | findstr :2824
# Then look up the PID in Task Manager

On a firewall or network tap: Look at source and destination IPs alongside the port. CQG traffic would originate from client machines and terminate at CQG's data center infrastructure. Unexpected domestic IPs talking to each other on 2824 would warrant investigation.

Why Unassigned (or Barely Assigned) Ports Matter

The registered port range has 48,127 slots. Not all of them are filled, and not all of the filled ones are actively used. This creates useful ambiguity for network defenders: unexpected traffic on a port like 2824 stands out precisely because nothing well-known should be there.

Security tools use this. Baseline your expected port activity, then alert on deviations. A port that's registered to a financial trading company but showing up on a machine that runs no trading software is worth a second look.