Port 2754: apollo-cc — A Registered Ghost

What This Port Is

Port 2754 sits in the registered port range (1024–49151). These ports are not claimed by the operating system the way well-known ports are (0–1023), but they're not completely free either. Organizations can register them with IANA to signal their intended use and reduce conflicts.

Port 2754 has an IANA registration. The service name is apollo-cc, the description is "APOLLO CC," and the listed assignee is a company called Brand Communications.¹ Both TCP and UDP are listed.

That's where the trail goes cold. There is no publicly documented protocol, no RFC, no open-source project, no product documentation that explains what APOLLO CC actually does or did. The registration exists. The software, if it was ever built, left no visible trace.

What "Registered" Actually Means

A registered port is a claim, not a guarantee. The IANA registry is not a certificate of active use—it's a directory of stated intentions. Companies and developers request port assignments to avoid conflicts with each other. Some of those products ship and run for decades. Others never make it out the door.

Port 2754 appears to be in the second category. The registration is real. The service behind it is, for all practical purposes, invisible.

What You Might Find Here

Because 2754 has no dominant legitimate software using it, any service found listening on this port is application-specific or misconfigured. If you see activity on this port:

• An internal application may have picked it opportunistically
• Development tooling may have bound to it by default
• Something unexpected may be listening

The port has no documented malware associations, but that's less reassuring than it sounds—obscure ports are exactly where custom tools hide.

How to Check What's Listening

On Linux or macOS:

ss -tlnp | grep 2754
# or
lsof -i :2754

On Windows:

netstat -ano | findstr :2754

These commands show you whether anything is actively bound to the port and, if so, which process owns it. The process ID gives you the next thing to look up.

From outside the machine:

nmap -sV -p 2754 <target>

nmap with -sV attempts to fingerprint the service—useful if you're investigating traffic you didn't expect.