This is one python script which you can use to ping all IP addresses inside one subnet.
Running environment is Python3.
Usage:
Run the script under Python3:
$python3 pingsubnet.py
Please enter the network address: 10.0.9.0 <-=== You can enter the LAN network address here
Please enter the subnet mask length: 25 <-=== Then please enter the subnet mask length here
PING 10.0.9.1 (10.0.9.1) 56(84) bytes of data. ,_=== Now the script will start pinging all the IPs inside this LAN subnet.