Port 1768: CFT-7 — The Seventh Channel of a Forgotten File Transfer Empire

What This Port Is

Port 1768 has an official name: cft-7. That puts it at the end of a seven-port block — 1762 through 1768 — registered with IANA for Transfer CFT, a managed file transfer product originally developed by a French company called Sopra, later absorbed by Axway.

The "CFT" stands for Cross File Transfer. The "7" means this is the seventh channel in that block.

What Transfer CFT Is

Transfer CFT is enterprise managed file transfer software — the kind of system that moves payroll files from one bank's mainframe to another, or ships purchase orders between an ERP system and a supplier. It has been doing this, quietly and reliably, since the early 1990s.

It predates the web. It predates most of what most people think of as "the Internet." And it's still running in production environments today, because systems that move money tend not to get replaced until they break.

The protocol supports point-to-point and point-to-multipoint file exchange, with built-in audit logging, security validation, and retry logic. In an era before SFTP was ubiquitous, CFT was one of the serious answers to the question: how do you move a large file reliably between two enterprises that don't share infrastructure?

Why Seven Ports?

That's a fair question. The honest answer is: because that's how things worked in the early days of IANA port registration.

Companies would request a block of ports for a product, and IANA would grant them. Transfer CFT got 1762-1768. Whether the product actually used all seven channels in practice, or whether this was defensive reservation, is lost to time.

What remains is seven port entries in the IANA registry, each with a name and almost no documentation. Port 1768 is the last of them.

The Registered Port Range

Port 1768 sits in the registered port range (1024-49151). This range is different from the well-known ports below 1024:

• Ports 0-1023 (well-known): Reserved for the most foundational Internet services — HTTP, HTTPS, SSH, DNS, SMTP. Binding to these requires root/administrator privileges on most systems.
• Ports 1024-49151 (registered): Open to any software vendor or developer who registers with IANA. No privilege required to bind. Tens of thousands of entries, ranging from ubiquitous (MySQL at 3306) to obscure (this one).
• Ports 49152-65535 (dynamic/ephemeral): Not registered. Used temporarily by clients when making outbound connections.

Registration doesn't mean enforcement. Nothing stops another application from using port 1768. The registry is a coordination mechanism, not a lock.

How to Check What's Actually on This Port

If you see traffic on port 1768 on your network and want to know what's responsible:

On Linux/macOS:

# Show what process is listening on port 1768
ss -tlnp | grep 1768

# Or with lsof
lsof -i :1768

On Windows:

# Show listening processes
netstat -ano | findstr :1768

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

If something is listening there and you don't run Transfer CFT, it's worth investigating. Unassigned or obscure registered ports are occasionally used by malware specifically because they generate less scrutiny than well-known ports.

Why Unassigned and Obscure Ports Matter

The port system works because of coordination, not enforcement. When everyone honors the registry, port 80 means HTTP and port 22 means SSH. That shared understanding lets firewalls, proxies, and monitoring tools make meaningful decisions.

Ports like 1768 — registered but obscure, used by software few people run — are the gray zones. They exist in the registry, but nobody has memorized them. Traffic on these ports is hard to classify at a glance, which makes them attractive to both legitimate niche software and to attackers who want to blend in.

The port number itself tells you almost nothing. What matters is what's listening.