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One of the users on our website reports the following HTTP_USER_AGENT:

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; GTB6; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 3.1; .NET CLR 2.0.50727)

I cannot figure out what the GTB6 bit means. Google searches are pointless. Can someone explain what GTB6 means and, ideally, point me to a website that explains each part of the user agent, for the uncommon and infrequently seen parts?

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up vote 2 down vote accepted

According to, GTB6 means the user has Google Toolbar installed on her IE. That site should also help you decipher other symbols on the user agent string, by the way.

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Perfect! Exactly what I was looking for. – ChrisInEdmonton Aug 10 '09 at 19:05

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