Port Owner

What the app finds and shows

How to find what is using a port in 3 steps

1. Open the app — listening ports appear with the process name and PID behind each one.
2. Type the port number into the search box — e.g. 8080 — to find its owner instantly.
3. Copy the result for your bug report, or switch on “All connections” to see established sockets too.

The netstat problem: right data, unreadable form

Windows answers the question honestly — `netstat -ano` prints every endpoint with its PID — but the raw output fights you back: dozens of IPv4 and IPv6 rows, connection states in a column you have to read diagonally, and no process names at all, so you walk the PID over to Task Manager by hand. On localized Windows the headers are translated while the protocol keywords are not. Port Owner does the same query, then joins the PIDs with the process list and renders the result as rows a human can scan, with listeners first.

The three classic moments you need this

One: “port 8080 is already in use” — a leftover node.exe from yesterday's session is holding it; find it in one search and end the right process in Task Manager. Two: a game or service will not start because it “cannot bind port” — check whether the port is really free or claimed by another instance. Three: an unfamiliar listener on an unexpected port — see the owning process immediately instead of guessing. The listening-only view exists exactly for these scenarios: it filters noise down to the sockets that actually block ports.

Read-only, offline, no admin rights

Port Owner runs the standard Windows tools (netstat and tasklist), parses their output and shows it — nothing is opened, blocked or killed. No firewall changes, no admin elevation, no network traffic of its own, no accounts. Killing the right process stays where it belongs: in Task Manager, where you can see the program's window and decide. The tool deliberately never offers a “kill” button: a mysterious listener is often a service you want.

Features

• Every TCP and UDP endpoint with the owning process name and PID
• Listening ports only by default; “All connections” switch for everything
• Live search by port number, process or PID
• Protocol, local address and connection state at a glance
• One-click copy of a row for bug reports
• Refresh re-reads the current socket table
• Read-only: nothing is blocked, killed or changed
• No admin rights, works offline, no accounts
• Reads the standard netstat/tasklist data — nothing invented
• UDP endpoints included (they have no state column)
• Dark and light themes
• 16 interface languages, no ads, no telemetry

Screenshots