You can trace a chain of DNS servers to the source and troubleshooting dns issues with dnstracer command.
dnstracer www.google.com
OR try old good dig :)
dig +trace www.google.com
Trace using IPv4 and IPv6 root servers:
dnstracer -4 -s . www.google.com
dnstracer -6 -s . www.google.com
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Thnx Nixcraft
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