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On 17 Nov 2002 07:44:38 -0500, Doug Potter wrote:

> Actually that is a class B address.
> 
> The first octet of a class A is 1-126 (127 reserved for loop back)
>                      class B is 128-191
>                    class C is 192-223
> 
> since 172 is between the ranges of 128-191 that would make it class B
>  
> Class B subnet 255.255.0.0 or /16

The step from Class B to /16 is beyond me. If memory serves
correctly, the Class B subnet in RFC1918 is 172.16.0.0/12
which would be netmask 255.240.0.0.

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