Shodan-a very powerful search engine for network assets and equipment, but relatively few searches for domestic assets. There is a search engine similar to this in China, which can make up for the problem of less domestic assets. The search principle is similar: fofa
zoomeye-a domestic search engine that focuses on asset discovery at the Web level, while Shodan focuses more on the host level
Censys-He has a very obvious advantage that it is free, and it can also get a good harvest
Reference link
https://www.freebuf.com/sectool/129211.html Comprehensive evaluation of cyberspace search engines
https://www.secpulse.com/archives/122365.html OSINT (1): Internet asset search engine