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Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa?

Fred Baker <fredbaker.ietf@gmail.com> Thu, 06 June 2019 21:41 UTC

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From: Fred Baker <fredbaker.ietf@gmail.com>
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Subject: Re: Is 1111 1110 10 equal to 0xfe80 or 0x3fa?
Date: Thu, 06 Jun 2019 14:41:11 -0700
In-Reply-To: <a71b00b7-0e0c-242a-b3f7-147f4c6b2eb0@gmail.com>
Cc: IPv6 <ipv6@ietf.org>
To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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> On Jun 6, 2019, at 10:18 AM, Alexandre Petrescu <alexandre.petrescu@gmail.com> wrote:
> 
> I maintain that 1111 1110 10 equals 0x3fa, because that's what my Windows Calculator says: I type 1111 1110 10 and it converts to 0x3fa.

You're correct if those are the only bits. However, in 1111 1110 10 you have to also include 00 0000, because it's a /10 prefix. It's fe80::/10, not ten bits of information with the least significant bit in the "ones" location.
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