TLD Survey:Open Recursive/Caching?

• Methodology

  • For each zone & server, do

    • Query server for obvious out-of-zone data with recursion off
    • Repeat query with recursion on
    • Repeat query with recursion off again

      • If 1st response is referral, and 2nd and 3rd responses have the “ra” bit set (and are the same, modulo TTL differences), then the server is open recursive/caching

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