Where can I obtain a list of User Agents for SEO bots

Question

i am planing on implementing a simplistic filter on how much of my site unregistered users can acces. need to compile a list of names of user agents I will allow, for this, I need a list of the names of the bots, starting with Googlebot

Answer 1

add crawler user agents and that would help in the major part and avoid viewing through search engine cache