You are, presumably, already familiar with the ISC Looking Glass?

https://isc.sans.edu/api/dnslookup/google.com

Yes, the ISC Looking Glass is a great resource — it’s handy for quick DNS lookups and seeing how queries resolve from their vantage point. This project is aimed more at benchmarking and monitoring resolvers over time, so they complement each other: Looking Glass for snapshots, dns‑benchmark‑tool for comparative speed and ongoing health checks.