Convert Dynamic IP to static IP in a Windows computer or server

Make sure the Powershell should be opened with  elevated privilege 

$Domain =  read-host "Enter the domain name for the DNS Suffix "

#Collect Network Configuration variables

$IfName = (Get-NetIPInterface -AddressFamily IPv4 -Dhcp Enabled).InterfaceAlias

$IfIndex = (Get-NetIPInterface -AddressFamily IPv4 -Dhcp Enabled).ifIndex

$IP = (Get-NetIPConfiguration -InterfaceIndex $IfIndex | Select-Object -ExpandProperty IPv4Address).IPv4Address

Start-Sleep -Seconds 20

Write-host "IP Address set as: $IP."

$Gateway = (Get-NetIPConfiguration -InterfaceIndex $IfIndex | Select-Object -ExpandProperty IPv4DefaultGateway).NextHop

Write-host "Gateway set as: $Gateway."

$PrefixLength = Get-NetIPAddress -InterfaceIndex $IfIndex | Select-Object -ExpandProperty PrefixLength

$DNSServers = @()

$DNS = @()

$DNS = Get-DnsClientServerAddress -InterfaceIndex $IfIndex | Select-Object -ExpandProperty ServerAddresses

foreach($item in $DNS)

{

    $DNSServers += $item

}

Write-host  "Start-WindowsAMI - Preparing to modify IP configuration."

#remove existing IP configuration, then reconfigure new static IP configuration

Try

{

    Remove-NetIPAddress -IPAddress $IP -DefaultGateway $Gateway -Confirm:$false -ErrorAction STOP

    New-NetIPAddress -InterfaceIndex $IfIndex -IPAddress $IP -PrefixLength 22 -DefaultGateway $Gateway -Confirm:$false -ErrorAction STOP

    Start-Sleep -Seconds 10

    Set-DnsClientServerAddress -InterfaceIndex $IfIndex -ServerAddresses $DNSServers -Confirm:$false -ErrorAction STOP

    Set-NetAdapterBinding -Name $IfName -DisplayName "Internet Protocol Version 6 (TCP/IPv6)" -Enabled:$false -Confirm:$false -ErrorAction STOP

    Write-host  "Start-WindowsAMI - IP modifications complete."

}

catch

{

    Write-host  "Start-WindowsAMI - Failed IP Modifications.`r`n$_"

}

# Setting DNS Address prefix

Try

{

   Set-DnsClientGlobalSetting -SuffixSearchList @($Domain)

   Set-DnsClient -InterfaceIndex $IfIndex -ConnectionSpecificSuffix $Domain

   

   Write-host  "Start-WindowsAMI - DNS Prefix complete"

}

catch

{

   Write-host  "Start-WindowsAMI - Failed DNS Prefix"

}