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masscan
TCP port scanner, spews SYN packets asynchronously, scanning entire Internet in under 5 minutes.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I'm attempting to help a school consolidate their IP space. They have been using a /8 for several decades and have thousands of devices spread out over the entire range with random "easy to remember" IP addresses like "10.25.25.25". I am trying to use the Masscan utility (https://github.com/robertdavidgraham/masscan) to find as many of the used IPs as possible so that we can begin to break up the /8 into smaller networks. They have a good size Netgate appliance, I believe the 7100 running the latest stable firmware.