Consider trying Spyse for subdomains

[Luci-d]

May be a great data source as they maintain a large DB. As far as I tested, the data is up to date.

Also, I would not use censys subdomains, too many questions for the quality of the provided data. They closely work with the government, and I guess just not interested in regular users.

[mzfr]

@Luci-d I think spyse is paid

[Luci-d]

Yeah, same as Censys and Shodan.
You have a limited amount of requests for free. Also, I think you could ask 'em for a discount or free usage. They are pretty open to getting access to the developers. Founder of spiderfoot got it for free...