example.com and www.example.com are separate DNS names; a result for one doesn't settle the other. I build Netsight, an iPhone/iPad network toolkit with DNS Lookup for checking those answers.
For your next domain check, look up each hostname people will actually use. Netsight queries public DNS resolvers, so the answer belongs to that resolver's view. Your router's DNS or browser cache can differ.
Look up your domain in Netsight. Free, iOS/iPadOS 26+.
Source: r/dns · by /u/Efficient_Context_23