Port 2013 sits in the registered ports range (1024–49151). These are ports that organizations and developers can formally register with IANA, the Internet Assigned Numbers Authority, to stake a claim for their software. Unlike the well-known ports below 1024 — where HTTP lives at 80, SSH at 22, DNS at 53 — registered ports don't come with operating system enforcement. Any program can open them. Registration is just a flag in a database saying "we were here first."
What the Databases Say
Port databases list port 2013 under two names:
- TCP 2013: raid-am — associated with a remote administration and disk imaging tool
- UDP 2013: raid-cd — a companion service for the same tool
The "RAID" here is not the storage technology you know. It doesn't stand for Redundant Array of Independent Disks. It refers to a separate piece of software — a remote administration and disk imaging utility — that used this port for network-based filesystem access and system management. 1
This is a genuine naming collision, one of many in the port namespace. The storage RAID is everywhere. The administration RAID that claimed port 2013 is essentially nowhere. Documentation is sparse, real-world deployments are nearly nonexistent, and no major enterprise tool seems to have made this port its home.
What This Means in Practice
Port 2013 is quiet. Port scanners pass over it without incident on most networks. It doesn't show up in breach reports. It's not a known attack vector.
If you see port 2013 open on a system you manage, something put it there deliberately — whether that's an obscure internal tool, a custom application, or something worth investigating. The port has no official tenant, so anything listening there is by choice, not convention.
How to Check What's Listening
On Linux/macOS:
On Windows:
The process ID in the output will tell you what's using it. From there, check your process list or task manager to identify the application.
Why Unassigned Ports Matter
The registered range contains 48,128 ports. Most of them look like port 2013 — claimed by something small, obscure, or forgotten, or simply never claimed at all. This is by design.
The port namespace exists so that applications can find each other without negotiating every time. Standardization lets you know, without asking, that your SSH client should try port 22. But standardization only works for the ports people actually use. The rest sit in the registry as a quiet reminder that the Internet was built with more room than it needed — and that room has been slowly, imperfectly filled over decades.
Port 2013 is one of thousands of nearly empty addresses. It has a name on paper. What it lacks is a story.
Frequently Asked Questions
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