Port 930 — Unassigned well-known port

Status: Unassigned
Range: Well-known ports (0-1023)
Protocol: TCP/UDP (available for both)

Port 930 is unassigned. It's a number in the phone book with no name next to it.

What "Unassigned" Means

The Internet Assigned Numbers Authority (IANA) manages port assignments¹. Ports fall into three states:

• Assigned — Currently claimed by a registered service
• Unassigned — Available for assignment upon request
• Reserved — Held by IANA for special purposes

Port 930 sits in the unassigned category. Anyone can request it through IANA's formal application process, but so far, no one has.

The Well-Known Range

Port 930 sits in the well-known ports range (0-1023)². These ports require root privileges to bind to on Unix-like systems, making them more controlled than higher-numbered ports. The well-known range was meant for fundamental Internet services—things like HTTP on port 80, HTTPS on port 443, SSH on port 22.

But the well-known ports aren't completely full. The range from 914 to 952 is mostly unassigned³. These are gaps left in a system designed in the early days of networking, when no one knew exactly which services would become essential and which would fade away.

Port 930 is one of those gaps.

Why Unassigned Ports Matter

Empty port numbers serve a purpose. They're available when someone builds something new and needs an official home for it. Conservation of port numbers matters—there are only 65,535 total ports, and the well-known range holds just 1,024 of them.

IANA has procedures to reclaim ports too¹. Services that were once assigned can become unassigned again through de-assignment or revocation. The port system stays flexible this way, adapting as the Internet changes.

Checking What's Listening on Port 930

Even though port 930 has no official assignment, something could still be using it on your system. Applications can bind to any port they want, official assignments or not.

On Linux, check with netstat:

sudo netstat -tulpn | grep :930

Or use lsof:

sudo lsof -i:930

On macOS:

sudo lsof -i:930

On Windows:

netstat -ano | findstr :930

If nothing returns, port 930 is unused on your system⁴.

The Empty Slots

Port 930 is a reminder that the Internet's infrastructure contains intentional gaps. Not every number needs to be claimed. Not every slot needs to be filled. Sometimes the most valuable thing is having space left for whatever comes next.