Slow or unreliable Wi-Fi often comes down to channel congestion, with too many nearby routers sharing the same frequency, but Windows won’t show you that detail on its own. WifiInfoView is a free, portable scanner from NirSoft that surfaces every access point in range with its SSID, BSSID, channel, signal quality, frequency band, vendor, and more.
What is WifiInfoView?
WifiInfoView is an established portable Wi-Fi scanner for Windows 10 and 11. NirSoft actively maintains it, and it runs as a single executable: no installer, no background service, no admin rights required. Drop it on a USB drive or a synced cloud folder and you can run it on any Windows machine you work on.
What WifiInfoView shows you:
- SSID (network name)
– BSSID (the MAC address of the specific access point radio)
– Signal quality and RSSI (signal strength in dBm)
– Frequency band (2.4 GHz, 5 GHz, or 6 GHz for Wi-Fi 6E and Wi-Fi 7 networks)
– Channel number
– PHY type (Wi-Fi 4 / 802.11n, Wi-Fi 5 / 802.11ac, Wi-Fi 6 / 802.11ax, Wi-Fi 6E, Wi-Fi 7)
– Security type (WPA2-Personal, WPA3, etc.)
– Vendor and company name (D-Link, Netgear, TP-Link, Ubiquiti, etc.)
– Router model and router name (where the access point broadcasts this)
– First detection, last detection, and detection count
How to Download and Run WifiInfoView
- Go to the NirSoft WifiInfoView page and download the ZIP file.
2. Extract the ZIP to any folder. Your Desktop, a USB drive, or a cloud-synced folder all work.
3. Double-click WifiInfoView.exe. No installation wizard appears; the app opens directly and begins scanning immediately.
The upper pane fills with every access point WifiInfoView detects and refreshes automatically. To change the refresh rate, go to Options > Update Rate.
Reading the Network List
The default column set handles most troubleshooting scenarios without any configuration. Here’s what the key columns mean:
- SSID: The network name the router broadcasts. Hidden networks may appear blank or show only partial information.
– BSSID: The MAC address of the specific access point radio. Useful when multiple APs share the same SSID, as in a mesh network.
– Signal Quality: A 0–100% value derived from RSSI; higher is better. Anything above 70% is a usable signal for most purposes.
– PHY Type: The Wi-Fi standard in use, such as 802.11ax (Wi-Fi 6 or 6E), 802.11ac (Wi-Fi 5), 802.11n (Wi-Fi 4), and so on.
– Frequency: 2.4 GHz, 5 GHz, or 6 GHz. The 6 GHz band only appears on Wi-Fi 6E and Wi-Fi 7 access points.
– Channel: The specific channel the access point broadcasts on. This is the number to compare when diagnosing congestion.
– Company: The vendor identified from the BSSID’s OUI prefix. If this column is blank, place an updated oui.txt file in the same folder as WifiInfoView.exe to improve vendor lookups.
Right-click any column header to add or remove columns, including Router Model, Router Name, Security, and detection timestamps.
Using Summary Modes to Find Channel Congestion
Summary modes are WifiInfoView’s most useful feature for diagnosing interference. Click Options to switch between them.
Channels Summary Mode
This groups all detected networks by channel and shows how many access points are broadcasting on each one. Use it to find the least congested channel for your router.
- Click Options > Channels Summary Mode.
2. The list now shows one row per channel, with a count of networks detected on it.
3. Note the channel with the fewest networks, then log into your router’s admin page and switch to it.
On the 2.4 GHz band, channels 1, 6, and 11 are the only non-overlapping options. If all three are packed, switching to 5 GHz is a better move. The 5 GHz band has far more non-overlapping channels and much less congestion in most homes and offices. If your router supports Wi-Fi 6E or Wi-Fi 7, the 6 GHz band is emptier still.
Companies Summary Mode
This groups detected access points by the equipment manufacturer. Useful when you’re auditing a network or identifying your own router in a dense list.
- Click Options > Companies Summary Mode.
2. The list shows one row per vendor with a count of detected access points from that manufacturer.
PHY Types Summary Mode
This breaks down nearby networks by Wi-Fi generation: Wi-Fi 4 through Wi-Fi 7 where detectable. Useful for understanding the mix of standards in your environment and whether older devices might be pulling your AP’s performance down.
- Click Options > PHY Types Summary Mode.
2. The list shows one row per PHY type with a count of detected networks using that standard.
Built-in Windows Alternative: netsh wlan
If you only need a quick channel lookup and don’t want to download anything, Windows includes a command that handles basic network scanning with no third-party software:
- Press
Windows + S, type cmd, and open Command Prompt.
2. Type the following and press Enter:
netsh wlan show networks mode=bssid
The output lists every nearby SSID, BSSID, signal percentage, and channel. It’s fast and built right into Windows. It lacks WifiInfoView’s summary modes, sortable columns, and real-time refresh, but it’s the right call when you’re on a machine you can’t put extra software on.
Conclusion
Channels Summary Mode is where WifiInfoView solves the problem for most people: find the emptiest channel, switch your router to it, and the congestion is gone. If you’re no longer dealing with slow or dropping Wi-Fi after that change, you’re done. For deeper work like mesh roaming analysis or full site surveys, a dedicated professional analyzer is the next step, but WifiInfoView handles everyday channel planning and AP identification cleanly, and the zero-install design means it’s always ready when you need it.
