When using simple (e.g. php) script to catch the number of indexed pages and backlinks for a domain; search engines may ban the server IP to capture these information. For example, bing has clearly stated in ToS of API that must NOT use for getting the number of results. Bu there are lots of chrome and firefox extensions, capturing these data for every page I visit (even I do not want these data). How they work? Where is the best source to capture these data? I want to write a simple php script to catch the number pages indexed by Google, Bing, Yahoo, and backlinks. NOTE: There are advanced scripts with mysql support for this purpose (to avoid regular connection to search engines), but I want a simple real-time script.