README.md

Powershell script to list active DNS servers according to access priority

The PowerShell script lists the DNS servers configured on the active network interfaces of a Windows system. It filters the network interfaces to include only those that are currently connected (status "Up") and retrieves the DNS server information for those interfaces. The output is sorted by interface metric, which reflects the priority of the interfaces, and includes the interface alias, interface metric, and DNS server IP addresses.

Usage

1. Save the script as List-Prioritized-DNS-Servers.ps1.
2. Navigate to the directory where the script is saved.
3. Run the script using the command: .\List-Prioritized-DNS-Servers.ps1.

Output

The script outputs a table with the following columns:

• InterfaceAlias: The name of the network interface.
• InterfaceMetric: The metric of the network interface, reflecting its priority. Lower number have highest priority.
• DnsServers: The IP addresses of the DNS servers associated with the interface.

Examples

InterfaceAlias InterfaceMetric DnsServers

Ethernet 5     20              192.168.8.1
Ethernet 5     20              192.168.8.2
Wi-Fi_Laptop   45              10.0.0.1
Wi-Fi_Laptop   45              1.1.1.1
Wi-Fi_Laptop   45              8.8.8.8

List-Prioritized-DNS-Servers.ps1

$connectedInterfaces = Get-NetAdapter | Where-Object { $_.Status -eq 'Up' }

$connectedInterfaces | ForEach-Object {
    $interfaceAlias = $_.Name
    $dnsServers = Get-DnsClientServerAddress -InterfaceIndex $_.InterfaceIndex -AddressFamily IPv4 | Select-Object -ExpandProperty ServerAddresses
    $interfaceMetric = (Get-NetIPInterface -InterfaceIndex $_.InterfaceIndex).InterfaceMetric | Select-Object -First 1
    for ($i = 0; $i -lt $dnsServers.Count; $i++) {
        [PSCustomObject]@{
            InterfaceAlias  = $interfaceAlias
            InterfaceMetric = [string]$interfaceMetric
            DnsServers      = $dnsServers[$i]
            Order           = $i
        }
    }
} | Sort-Object InterfaceMetric, Order | Select-Object -Property InterfaceAlias, InterfaceMetric, DnsServers | Format-Table -AutoSize