Port 60043 — Unassigned Dynamic Port

What Port Range Is This?

Port 60043 falls within the dynamic (or ephemeral) port range: 49152–65535. ¹ These ports are never officially assigned by IANA. They exist for one reason: to be used temporarily and automatically.

When your browser needs to connect to a server, the operating system assigns it a dynamic port automatically—usually something in this range. The connection uses that port, then releases it when done. The port number disappears back into the pool. It's allocation without registration, assignment without authority.

Why This Matters

Because dynamic ports are free for any process to use, they're the Internet's equivalent of an unmarked parking space: anyone can pull in. Your legitimate applications use them constantly. So do programs you didn't install and don't want.

Known Unofficial Uses

Port 60043 has been documented as being used by Trojan.DownLoader34.3753, a piece of malware that uses ports in the 60000–60100 range for command and control communications. ² This trojan injects code into system processes, creates persistent backdoors, and downloads additional malicious payloads.

This is not theoretical. Security researchers at Dr.Web have documented actual malware activity on this specific port.

How to Check What's Listening on Port 60043

If you suspect something is using this port on your system:

On Linux/macOS:

lsof -i :60043
netstat -an | grep 60043
ss -tulpn | grep 60043

On Windows:

netstat -ano | findstr :60043
Get-NetTCPConnection -LocalPort 60043

These commands will show you what process (if anything) is listening on the port. Look for suspicious process names or PIDs you don't recognize.

The Broader Picture

Dynamic ports exist because we need them. Millions of legitimate connections happen through the ephemeral range every second. But that same openness—that "use any port you need"—is exactly what makes them attractive to malware.

Unlike well-known ports (like 80 for HTTP or 443 for HTTPS), which are closely monitored and protected, dynamic ports fly under the radar. A trojan can pick port 60043 and quietly establish a command channel to its controller. No one registers it. No firewall rule prevents it by name. It's just another number in the noise.

This is why security researchers watch these ranges carefully. Random port numbers with active malware associations matter.