Shodan is a search engine that lets you find specific types of computers (webcams, routers, servers, etc.) connected to the internet using a variety of filters.
This is a very cheap upgrade from the free to lifetime membership. Membership provides you with the ability to initiate scans and monitoring.
https://help.shodan.io/the-basics/account-faq
https://twitter.com/shodanhq/status/1376610973629493254
Shodan now has more than 4 million users! To celebrate we are offering the membership at a discounted price of $4 for the next 24 hours
What do you use this for?