dns software fingerprinting
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dns software: 软件识别

直接查询
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    dig @202.38.64.1 ch txt version.bind.

指纹识别
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`fpdns <https://github.com/kirei/fpdns)>`_

`Towards passive DNS software fingerprinting <http://dl.acm.org/citation.cfm?id=2534144)>`_