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In Windows, Every software or tool has one or multiple processes with dependencies.
For example, If you installed apache tomcat on windows, start the server, It listens on the 8080 port by default.
Sometimes, if any process runs on the same port number, You will get an error
8080 is already in use, Please try different ports
This post covers ways to check process id and name details for a given port
nestat command to get the process id
netstat command list out all process and type of connection, process id as well as the hostname
This command lists the following information
protocol like TCP or UDP
Local address
Foreign Address
State like LISTENING, ESTABLISHED, TIME_WAIT
Process ID
Here is a command to know the process id and protocol type
C:\>netstat -aon
Active Connections
Proto Local Address Foreign Address State PID
TCP 0.0.0.0:80 0.0.0.0:0 LISTENING 4
TCP 127.0.0.1:3003 0.0.0.0:0 LISTENING 3852
TCP 192.168.29.53:31106 116.202.172.174:443 ESTABLISHED 2268
TCP [::]:80 [::]:0 LISTENING 4
UDP 0.0.0.0:3702 *:* 6100
From the above result, you can filter data using pipe symbol with the findStr function
C:\>netstat -ano | findStr "3000"
TCP 0.0.0.0:3000 0.0.0.0:0 LISTENING 16876
TCP [::]:3000 [::]:0 LISTENING 16876
Another way, if you know the process id, you can use the tasklist command as seen below
The following find out process id is using which port
C:\>tasklist /fi "pid eq 16876"
Image Name PID Session Name Session# Mem Usage
========================= ======== ================ =========== ============
node.exe 16876 Console 1 78,472 K
Find out Process name and id using PowerShell in windows
PowerShell is a powerful command-line tool to know process details
The below command finds out the process name for the given port
PS C:\> Get-Process -Id (Get-NetTCPConnection -LocalPort 3002).OwningProcess
Handles NPM(K) PM(K) WS(K) CPU(s) Id SI ProcessName
------- ------ ----- ----- ------ -- -- -----------
281 68 127908 98768 12.64 18548 1 node
below the command find out the process id for the given port number
PS C:\> Get-NetTCPConnection -LocalPort 3002| Format-List
LocalAddress : 0.0.0.0
LocalPort : 3002
RemoteAddress : 0.0.0.0
RemotePort : 0
State: Listen
AppliedSetting :
OwningProcess: 18548
CreationTime : 29-04-2021 12:47:28
OffloadState : InHost
