Fierce Domain Scan

Written by RSnake with input from id, Vacuum and Robert E Lee. A special thanks to IceShaman to porting it to use multi-threading.
Fierce domain scan was born out of personal frustration after performing a web application security audit. It is traditionally very difficult to discover large swaths of a corporate network that is non-contiguous. It's terribly easy to run a scanner against an IP range, but if the IP ranges are nowhere near one another you can miss huge chunks of networks.
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