Find all open DNS recursors on your (or other) networks.
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Recursorscanner - Find open DNS recursors

Recursorscanner is a small program written in C to exactly solve one task:

Find all open DNS recursors on your (or other) networks.
The program simply sends a question for an A record (google.com) to the destination ip.
If an answer is received we've found an open recursor.

Should run on all Linux/Unix systems.