Primary DNS is the main authoritative DNS server (or nameserver) that serves as the initial stop for a query as the user-entered domain name is translated into an IP address that the system can understand—after all, we don't speak the same language, so we need a translator to help us with every website visit.

How do I know which DNS server is primary?

Open your Command Prompt from the Start menu (or type “Cmd” into the search in your Windows task bar). Next, type ipconfig/all into your command prompt and press Enter. Look for the field labeled “DNS Servers.” The first address is the primary DNS server, and the next address is the secondary DNS server.

How do I find my primary DNS and Secondary DNS?

Android DNS Settings

To see or edit the DNS settings on your Android phone or tablet, tap the "Settings" menu on your home screen. Tap "Wi-Fi" to access your network settings, then press and hold the network you want to configure and tap "Modify Network." Tap "Show Advanced Settings" if this option appears.