Ashkon Software

Open Ports Scanner - Check Open Ports and See Who Is Connected to Your PC

Open Ports Scanner lists every open TCP and UDP port and network connection on your computer, IPv4 and IPv6, together with the process that owns it – and who is on the other end. For each connection you see the protocol, process ID, process name or full path, local and remote addresses and ports, connection state, remote host name and the network that owns the remote address.

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Open Ports Scanner main window

Features

Open ports and connections

  • All TCP and UDP endpoints, IPv4 and IPv6, with the owning process ID and process name or full file path.
  • Local and remote addresses and ports and the connection state (LISTEN, ESTABLISHED, TIME_WAIT and others).
  • Display filter: show or hide TCP v4, UDP v4, TCP v6 and UDP v6 connections.
  • Sort by any column with a click; column widths are remembered.
  • Choose the columns to display: Protocol, PID, Process Name, Local Address, Local Port, Remote Address, Remote Port, Connection State, Remote Host and AS / Organization.

Real-time monitoring

  • Automatic refresh at the interval you choose with a slider; start and stop monitoring at any time.
  • Flicker-free updates: only rows that changed are updated, and your selection and scroll position are kept.
  • Change highlights: new connections flash green, closed connections flash red.
  • Status bar statistics: total endpoints, how many are shown, established and listening, and the refresh interval.
  • Run minimized in the system tray, and keep the window always on top.

Find out who your computer is talking to

  • Remote Host column with the reverse DNS name of each remote address.
  • Optional AS / Organization column with the network that owns the address — for example Google, Microsoft, Amazon, Cloudflare or your ISP.
  • IP Info window with the official registration record (RDAP) of the address: network name and range, CIDR, country, registration dates, the organization that holds it and its abuse contact. Copy the record or open it in your browser.
  • Private and local addresses are recognized and never looked up; the Remote Host and AS / Organization columns can be turned off in Settings.

Search

  • Search bar (Ctrl+F) filters the list as you type, across all visible columns: a process name, a port, an IP address, a host name or a connection state.
  • Press Enter or Down to jump to the results; Esc clears the search, a second Esc closes the bar.

Actions

  • Close an unwanted TCP connection without terminating the process that owns it.
  • Show in Windows Explorer: open the folder that contains the process file.
  • Copy the remote address to the clipboard, and view full connection details.
  • Export the list to a CSV file for Excel, or print it.
  • Elevate: restart with administrator rights to see the names of all processes, including system services.

It is a fast, readable replacement for netstat. Use it to find unknown programs talking to the Internet, detect trojans and other malicious software, check which services are listening on your machine and troubleshoot network problems. The list updates automatically and without flicker: new connections flash green and closed ones flash red, so you can watch network activity as it happens.

How to check open ports on Windows

  1. Download and install the free 30-day trial of Open Ports Scanner and start it. All open TCP and UDP ports and connections, IPv4 and IPv6, are listed at once with the process that owns each one.
  2. See every process name: choose Action > Run as Administrator, so the names of system services are shown too.
  3. Find a port or a program: press Ctrl+F and type a port number, a process name or an IP address. Only the matching rows stay in the list.
  4. Check who is on the other end: read the Remote Host and AS / Organization columns, or select a row and choose Action > IP Info for the registration record of the address.
  5. Act on it: select an unwanted IPv4 TCP connection and choose Action > Close Connection, or save the list with File > Export to File.

When you need to see open ports and connections

  • “Port already in use”: a web server, database or game server will not start because another program holds the port. Type the port number in the search bar to see which program it is.
  • Who is connected to my computer? Every TCP connection is listed with the remote address, its host name and the organization that owns the network.
  • An unknown program is using the Internet: see its name or full path, open its folder in Windows Explorer and decide whether it belongs on your PC.
  • Which services are listening: sort by Connection State to see every port in the LISTEN state on this computer.
  • Watching network activity: with automatic refresh on, new connections flash green and closed ones flash red.
  • Tired of netstat: the same kind of list that netstat -ano prints, with process names, sorting, search and CSV export.

Looking for devices, not ports? Open Ports Scanner shows the ports and connections of this computer. To find every device on your home network or Wi-Fi, use GetNetworkInfo. To test whether a port answers on a remote server, use the TCP Port Check in PingTrace.

Main window

The connection list with the Search bar above it, the Remote Host and AS / Organization columns, and the IP Info window showing the registration record of a remote address. The status bar at the bottom shows the connection statistics.

Frequently asked questions

How do I see which program is using a port on Windows?

Start Open Ports Scanner, press Ctrl+F and type the port number. The list shows the TCP or UDP endpoint on that port with the process ID and the name or full path of the program that owns it. Choose Action > Run as Administrator to see the names of system services too.

How can I see who is connected to my computer?

Every TCP connection is listed with its remote address, remote port and state. The Remote Host column shows the reverse DNS name of the remote address, the AS / Organization column shows the network that owns it, and IP Info shows its registration record with the country and abuse contact.

Is Open Ports Scanner a replacement for netstat?

Yes. It shows the same kind of list as netstat -ano, in a window that refreshes automatically, with process names, host names, sorting, search, CSV export and printing.

Can I close a connection without closing the program?

Yes, for TCP connections over IPv4: select the connection and choose Action > Close Connection. The program that owns it keeps running. Closing UDP endpoints and IPv6 TCP connections is not supported. If closing fails, run Open Ports Scanner as administrator.

Does it scan the open ports of other computers?

No. It lists the open ports and connections of the computer it runs on. To test a port on a remote server, use the TCP Port Check in PingTrace. To find the devices on your network and their open ports, use GetNetworkInfo.

Does Open Ports Scanner work on Windows 11?

Yes. It runs on Windows 10 and 11 and on Windows 7, 8 and 8.1, 32-bit and 64-bit, and shows both IPv4 and IPv6 connections.

Is there a free trial?

Yes. The free 30-day evaluation version lets you check the ports and connections of your own computer before you buy. A license is $19.95.

Ordering

After a completed secure online order, an unlocking key file is emailed to you within two business days. Questions about ordering or registration: order@ashkon.com. Prices for all products are on the Order page.