Port 10167 — An Empty Door

The Port Range: Registered (1024–49151)

Port 10167 sits in the registered user port range ¹. These are the middle ground of the port numbering system:

• Well-known ports (0–1023): Reserved for standard protocols (HTTP, SSH, DNS, SMTP)
• Registered ports (1024–49151): For vendor-specific applications, database servers, enterprise software, and services that needed an assigned port number
• Dynamic/ephemeral ports (49152–65535): Temporary ports assigned on-the-fly by operating systems

Being in the registered range means this port could have been claimed by an organization or service. It wasn't.

The Actual Status

Port 10167 has no official IANA registration ². The official service registry is empty for this port. No RFC defines it. No standard protocol runs here.

The only documented activity is a warning: PortalOfDoom, a trojan malware, has been observed using this port ². That's the entire history.

Why Empty Ports Matter

The registered port range has ~48,000 numbers. Thousands remain unassigned. They're not mistakes—they're buffer room. As new services emerge, they can claim an unassigned port. But some ports get claimed by malware first. Port 10167 was apparently more attractive to malicious actors than to legitimate developers.

How to Check What's Listening

If you see traffic on port 10167, investigate immediately:

# macOS/Linux - see what's listening on port 10167
lsof -i :10167
sudo netstat -tulpn | grep 10167

# Windows - PowerShell
netstat -ano | findstr "10167"
Get-Process -Id (Get-NetTCPConnection -LocalPort 10167).OwningProcess

If nothing shows up, the port is silent. If something does: research the process name. Unassigned ports with listening services are red flags.

The Broader Picture

Port 10167 is honest in its emptiness. It's a reminder that the Internet's infrastructure—all those port numbers, protocols, registries—isn't just carved in stone. Some doors stay empty. Some get kicked in. The health of the network depends on knowing which is which.