Stupid Question maybe?

Brandon Martin lists.nanog at
Tue Dec 18 23:12:13 UTC 2018

On 12/18/18 5:52 PM, James R Cutler wrote:
> I am certain that I read the RFC years ago, but I can’t remember it.  Which RFC?

RFC796 defines the address formats for classes A, B, and C.  A starts 
with a 0 bit, B starts with 10, and C starts with 110 according to said RFC.
Brandon Martin

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