How to Create an Ad-Hoc Wi-Fi Hotspot in Batch Script

Learn how to configure and automate a Windows Wi-Fi hotspot using Batch scripts with netsh wlan or PowerShell for legacy and modern systems.

Sometimes you need to share your laptop's internet connection with other devices, or create a small local network for file transfers without a router. Windows includes a feature called the Hosted Network that allows your Wi-Fi card to act as a virtual access point. While modern Windows 10/11 has a "Mobile Hotspot" toggle in the settings GUI, a Batch script provides more direct control over the SSID and security key, making it ideal for kiosks or automated laboratory environments where a persistent, predictable hotspot is required.

This guide will explain how to configure and start a virtual Wi-Fi hotspot.

Method 1: Configuring and Starting the Hosted Network

We use the netsh wlan command to set the identity and security of the network.

@echo off
setlocal enabledelayedexpansion

set "SSID=MyAutomatedHotspot"
set "Pass=Password123!"

:: Check for Administrator privileges
net session >nul 2>&1
if !errorlevel! neq 0 (
    echo [ERROR] This script requires Administrator privileges.
    echo         Right-click and select "Run as administrator."
    pause
    endlocal
    exit /b 1
)

:: Verify the Wi-Fi adapter supports Hosted Network
echo [CHECK] Verifying Hosted Network support...
echo.

set "Supported=0"
for /f "tokens=2 delims=:" %%a in ('netsh wlan show drivers 2^>nul ^| findstr /i "Hosted network supported"') do (
    set "result=%%a"
    :: Remove leading space
    for /f "tokens=*" %%b in ("!result!") do set "result=%%b"
    if /i "!result!"=="Yes" set "Supported=1"
)

if !Supported! equ 0 (
    echo [ERROR] Your Wi-Fi adapter does NOT support Hosted Network.
    echo         This is common with modern WDI drivers.
    echo.
    echo         Alternatives:
    echo         - Use Windows Settings ^> Mobile Hotspot
    echo         - See Method 4 for the PowerShell approach
    pause
    endlocal
    exit /b 1
)

echo [OK] Hosted Network is supported.
echo.

:: Validate password length (WPA2 requires 8-63 characters)
set "PassLen=0"
set "tempPass=!Pass!"
:CountPass
if defined tempPass (
    set "tempPass=!tempPass:~1!"
    set /a PassLen+=1
    goto :CountPass
)

if !PassLen! lss 8 (
    echo [ERROR] Password must be at least 8 characters for WPA2 security.
    pause
    endlocal
    exit /b 1
)

:: 1. Set the mode, SSID, and key
echo [ACTION] Configuring Wi-Fi Hotspot...
netsh wlan set hostednetwork mode=allow ssid="%SSID%" key="%Pass%" >nul 2>&1

if !errorlevel! neq 0 (
    echo [ERROR] Failed to configure hosted network.
    pause
    endlocal
    exit /b 1
)

:: 2. Start the network
echo [ACTION] Starting the broadcast...
netsh wlan start hostednetwork >nul 2>&1

if !errorlevel! equ 0 (
    echo.
    echo ==========================================
    echo   HOTSPOT IS NOW ACTIVE
    echo ==========================================
    echo   SSID:     %SSID%
    echo   Password: %Pass%
    echo   Security: WPA2-PSK
    echo ==========================================
    echo.
    echo [WARN] Internet sharing is NOT automatic.
    echo        To share your internet connection:
    echo        1. Open ncpa.cpl
    echo        2. Right-click your internet adapter ^(Ethernet/Wi-Fi^)
    echo        3. Properties ^> Sharing tab
    echo        4. Check "Allow other network users to connect"
    echo        5. Select the new virtual adapter
) else (
    echo [ERROR] Failed to start hotspot.
    echo         Possible causes:
    echo         - Wi-Fi adapter is disabled
    echo         - Another hotspot is already running
    echo         - Driver doesn't support this feature
    echo.
    echo [TIP] Try: netsh wlan stop hostednetwork
    echo       Then run this script again.
)

:: Log the action
echo [%date% %time%] STARTED hotspot SSID=%SSID% by %USERNAME% >> "%USERPROFILE%\hotspot_log.txt"

pause
endlocal

Method 2: Stopping the Hotspot

Shuts down the network and hides your SSID.

@echo off
setlocal

:: Check for Administrator privileges
net session >nul 2>&1
if %errorlevel% neq 0 (
    echo [ERROR] This script requires Administrator privileges.
    pause
    endlocal
    exit /b 1
)

echo [ACTION] Stopping the Wi-Fi Hotspot...

:: Check if a hosted network is running
netsh wlan show hostednetwork 2>nul | findstr /i "Started" >nul 2>&1
if %errorlevel% neq 0 (
    echo [INFO] No active hotspot detected.
    pause
    endlocal
    exit /b 0
)

:: Stop the network
netsh wlan stop hostednetwork >nul 2>&1

if %errorlevel% equ 0 (
    echo [SUCCESS] Hotspot has been stopped.
) else (
    echo [ERROR] Failed to stop hotspot.
)

:: Optionally disable the hosted network entirely
echo.
set /p "DisableChoice=Disable Hosted Network mode entirely? (Y/N): "
if /i "%DisableChoice%"=="Y" (
    netsh wlan set hostednetwork mode=disallow >nul 2>&1
    echo [OK] Hosted Network mode has been disabled.
)

:: Log
echo [%date% %time%] STOPPED hotspot by %USERNAME% >> "%USERPROFILE%\hotspot_log.txt"

pause
endlocal

Method 3: Auditing Connected Devices

Once your hotspot is running, see who has connected and the network status.

@echo off
setlocal

echo [REPORT] Hotspot Status and Connected Clients
echo.

:: Check if hosted network is supported
netsh wlan show hostednetwork 2>nul | findstr /i "Not" >nul 2>&1
if %errorlevel% equ 0 (
    echo [INFO] Hosted Network is not configured or not supported.
    pause
    endlocal
    exit /b 0
)

:: Display full status
echo === HOSTED NETWORK STATUS ===
echo.
netsh wlan show hostednetwork
echo.
echo =============================

:: Extract client count
set "ClientCount=0"
for /f "tokens=2 delims=:" %%a in ('netsh wlan show hostednetwork ^| findstr /i "Number of clients"') do (
    for /f "tokens=*" %%b in ("%%a") do set "ClientCount=%%b"
)

echo.
if "%ClientCount%"=="0" (
    echo [INFO] No devices currently connected.
) else (
    echo [INFO] %ClientCount% device(s^) connected.
    echo.
    echo [TIP] To see connected devices' IP addresses:
    echo       arp -a
)

pause
endlocal

Method 4: Modern Mobile Hotspot (Windows 10/11)

If the legacy hostednetwork isn't supported by your Wi-Fi driver, use the modern Mobile Hotspot API through PowerShell.

@echo off
setlocal

:: Check for Administrator privileges
net session >nul 2>&1
if %errorlevel% neq 0 (
    echo [ERROR] This script requires Administrator privileges.
    pause
    endlocal
    exit /b 1
)

echo [ACTION] Configuring Mobile Hotspot via modern API...
echo.

set "Action=start"
if /i "%~1"=="stop" set "Action=stop"

if /i "%Action%"=="start" (
    powershell -NoProfile -Command ^
      "try { "^
      "  <# Check if Mobile Hotspot can be started #> "^
      "  $connectionProfile = [Windows.Networking.Connectivity.NetworkInformation,Windows.Networking.Connectivity,ContentType=WindowsRuntime]::GetInternetConnectionProfile(); "^
      "  if (-not $connectionProfile) { "^
      "    Write-Host '[ERROR] No active internet connection to share.'; "^
      "    exit 1; "^
      "  }; "^
      "  Write-Host '[INFO] Internet connection found. Opening Mobile Hotspot settings...'; "^
      "  Write-Host ''; "^
      "  Write-Host 'The Mobile Hotspot settings page will now open.'; "^
      "  Write-Host 'Toggle the switch ON and configure your SSID/password.'; "^
      "  Write-Host ''; "^
      "  Start-Process 'ms-settings:network-mobilehotspot'; "^
      "  Write-Host '[TIP] For fully automated control, use the Windows.Networking.NetworkOperators API.'; "^
      "} catch { "^
      "  Write-Host ('[ERROR] ' + $_.Exception.Message); "^
      "}"
) else (
    echo [ACTION] Opening Mobile Hotspot settings to disable...
    powershell -NoProfile -Command "Start-Process 'ms-settings:network-mobilehotspot'"
)

pause
endlocal

How to Avoid Common Errors

Wrong Way: Assuming All Cards Support Hosted Networks

Many newer Wi-Fi drivers (using the WDI driver model) have removed the Hosted Network feature in favor of the modern "Mobile Hotspot."

Correct Way: Before trying to start the hotspot, verify support:

netsh wlan show drivers | findstr /i "Hosted network supported"

If it says No, the legacy netsh method will not work. Use Method 4 or the Windows Settings toggle instead.

Wrong Way: Running Without Administrator Privileges

Modifying wireless network configuration is a system-level change. Without elevation, the commands fail with confusing error messages.

Correct Way: Always check for elevation at the start:

net session >nul 2>&1
if %errorlevel% neq 0 (
    echo [ERROR] Run as Administrator.
    exit /b 1
)

Wrong Way: Using a Weak Password

Since you are acting as the router, any device that joins your hotspot can potentially intercept traffic or access local resources. A password like 12345678 is trivially crackable.

Correct Way: Use a strong password of at least 12 characters with mixed case, numbers, and symbols. WPA2 requires a minimum of 8 characters. Method 1 validates the minimum length automatically.

Creating a hotspot only creates the Wi-Fi access point. It does not automatically share your laptop's internet connection.

Solution: You must enable Internet Connection Sharing (ICS):

Open ncpa.cpl
Right-click your internet-connected adapter (Ethernet or primary Wi-Fi)
Properties → Sharing tab
Check "Allow other network users to connect"
Select the new virtual adapter from the dropdown

Problem: Hotspot Stops Randomly

The hotspot often stops when the laptop enters Sleep or Power Save mode, disconnecting all clients.

Solution: Change your Wi-Fi adapter's power management settings:

Open Device Manager
Find your Wi-Fi adapter → Properties → Power Management
Uncheck "Allow the computer to turn off this device to save power"

Or via command line:

powershell -NoProfile -Command ^
  "Get-NetAdapter -Name 'Wi-Fi' | Disable-NetAdapterPowerManagement -ErrorAction SilentlyContinue"

Best Practices and Rules

1. Security First

Use a strong password (12+ characters recommended)
Change the default SSID to something that doesn't reveal your device type
Be aware that all traffic from connected devices passes through your laptop
Consider using WPA3 if your hardware supports it

2. Identify Disconnections

If the hotspot randomly stops, check:

Power save settings (see above)
Wi-Fi driver updates
Whether another application is taking control of the Wi-Fi adapter

3. Clear Driver Issues

If you cannot start the network after it previously worked:

:: Reset the hosted network
netsh wlan stop hostednetwork
netsh wlan set hostednetwork mode=disallow
netsh wlan set hostednetwork mode=allow
netsh wlan start hostednetwork

If that doesn't work, try resetting the network stack:

netsh winsock reset
netsh int ip reset
:: Restart required after these commands

4. Log Hotspot Activity

In shared environments, always log when the hotspot is started and stopped, and by whom. All methods above include automatic logging to %USERPROFILE%\hotspot_log.txt.

5. Check Connected Devices

Periodically audit who is connected to your hotspot. An unexpected client could indicate someone has guessed your password:

netsh wlan show hostednetwork
arp -a

6. Always Use `setlocal` / `endlocal`

Without setlocal, every variable your script creates persists in the parent shell session, causing potential conflicts when running multiple scripts in sequence.

Conclusions

Creating an ad-hoc Wi-Fi hotspot via Batch script is a powerful way to provide local connectivity on the fly. By moving from GUI-based toggles to automated command-line control, you gain the ability to deploy predictable, branded wireless links for specific tasks. This capability is essential for field work, legacy device support, and maintaining a high level of control over your local wireless environment.