RFC 1219:On the Assignment of Subnet Numbers
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significant bit

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2. A More Flexible and Efficient Technique for Assigning Subnet Numbers
... bits. (In all of our addresses, the least significant bit (LSB) is on the right, the most significant bit (MSB) ...
... addresses, the least significant bit (LSB) is on the right, the most significant bit (MSB) is on the left.) ...

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