website which downloads or crawls billlions of web pages 2nd after google

 https://ahrefs.com/

crawl all websites

338.5 Billion Pages 

209 Million Domains

3400 Servers

768k CPU cores

560M Keywords

Internet archive way back Machine

625 billion web pages

https://moz.com/

8 trillion pages

44 trilion links

743 Million domains


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