https://github.com/farrokhi/dnsdiag is another great toolbox for looking into DNS problems.

Yes, dnsdiag is a solid toolbox — it’s great for digging into DNS issues at the packet level. This project is aimed more at benchmarking and monitoring resolvers over time, so they complement each other well: dnsdiag for diagnostics and troubleshooting, dns‑benchmark‑tool for comparative speed and health checks.