what is running on port code example

Example 1: check which application is using port

In Windows CMD/Powershell:
netstat -aon | findstr '[port_number]'

Example 2: top running port

stop running  boort  8080
go to command past this 
netstat -ao |find /i "listening"
look for you port 
TCP    0.0.0.0:8080      machinename:0    LISTENING   12704
then write this 
 Taskkill /F /IM 12704