Censys makes it very easy to query the entire Internet for very specific data. While there is no way to export the results of a query directly from the web UI, we have released a CLI Tool that makes exporting results just as easy as querying for them.
For example, after you've installed the CLI Tool, running this query censys "23.20.0.0/16" --output json will write the first 100 results to a JSON file. You can also utilize the --fields [space separated list of fields you're interested in] --append false to only have the fields you're interested in returned in your results JSON.