How to Diagnose a Domain That Won't Resolve

https://internetsignals.tearosediner.net/how-to-diagnose-a-domain-that-won-t-resolve

Start by checking if your device can reach the internet at all; a simple ping to google will confirm. Then use nslookup or dig to see if the domain's nameservers respond; a timeout suggests DNS issues. Try the domain with a public resolver like 8.8.8.8 to rule out your ISP. If it works there, flush your local DNS cache or check your router. Still failing? Verify the domain's registration hasn't expired and that its nameservers are correctly set at the registrar.