Friday, 22 June, 2007

Google, Yahoo and Microsoft most biggest of Search Engine field agree on Sitemap standard

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Microsoft has added some information, on how to identify the different types of their MSNbot Crawlers, on the Live Search’s WebLog. The different types of the MSNbot are:

Main web crawler (

Images & all other media (

News and blogs (

Products & shopping (

Academic search (

They also explain a method, to verify the identy of the MSNbot. Might be useful, since a lot of spam bots are cloaking themself as searchengine crawlers.

  1. When you get a page view request, it specifies a user-agent and an IP address. As I described above, all requests from Live Search use a user agent starting with the word ‘MSNBot’.
  2. If you see the MSNBot user-agent, it’s time to check the identity of the bot. Starting with the IP address (i.e., you can use reverse DNS lookup to find out the registered name of the machine.
  3. Once you have the host name (in this case,, you can check that it really is coming from Live Search. The name of all live search crawlers will end with ‘’. If the name doesn’t end with ‘’, you know it’s not really our crawler.
  4. Finally, you need to verify that the name is accurate. In order to do this, you can use Forward DNS to see the IP address associated with the host name. This should match the IP address you used in Step 2 – if it doesn’t, it means the name was fake.

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