The notation you see is standardized so you understand that the significant bits are the 1st 10 bits of 128 bits.

Convert

`FE80::`

to Binary...Binary:

`*1111.1110.01*00.0000::`

What you see is = 16bits but the `/10`

means that only the `first 10 bits`

will remain unchanged...(i.e. `FE8..`

). So the range in HEX is the following:

`FE80:0000:0000:0000:0000:0000:0000:0000`

through

`FE8F:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF`

note that the first 10 bits remain unchanged as the last 118 bits do. So `FE80/8 has a range of (2^118) addresses = ~33,230,700,000,000,000,000,000,000,000,000,000,000,000

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