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I'm seeing this CPDTDF fragment fairly frequently in my logs, and I haven't found any information about it. Does anybody know what it means?

Some real examples:

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; PBSTB 1.2; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; CPDTDF; InfoPath.2; .NET4.0C)

Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; CPDTDF; Tablet PC 2.0; InfoPath.2; MSOffice 12

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.5; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; CPDTDF; Tablet PC 2.0; .NET4.0C; AskTbSTC/5.9.1.14019

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up vote 0 down vote accepted

CPDTDF and similar (CPDTDF etc) are manufacturer OEM IDs. These CP ones mean Compaq

See this link for a list of unknown user agent fragments

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