Query regarding OS detection

[priyank garg <gargpriyank () gmail com>]

Hi,
I need to do OS detection for all the hosts on a large network. I don't want
information about the open ports on these hosts but OS scan is unreliable
without port scan as it needs at least one open and one closed port. Is
there a way to stop port scan as soon as it finds an open port and doesn't
proceed with scanning other ports as the OS information is only what I want.

Thanks.
~Priyank
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