CCNA- R& S

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Have gone through cert guides for ICND1 and ICND2.

Currently revising IPV6.

Need assistance on this... Can anyone explain in simple terms how they converted hex to /12 or /32 like the one below.



Common block sizes for IPv6 addresses:

IPv6 addresses are distributed in blocks, just like IPv4. Here is a breakdown of the most common allocation sizes.

/12 issued by IANA to ARIN

/32 issued by ARIN to an ISP (can also get a /28, /24, etc.)

Each RIR /12 has 1,048,576 /32s to assign to ISPs.

/48 assigned by an ISP to a customer site (end users may also request directly from ARIN)

Each ISP’s /32 has 65,536 /48s to assign to customer sites.

/64 to a subnet at the customer’s site

Each customer’s /48 has 65,536 /64 subnets.

Each /64 subnet contains more than 18 quintillion IPv6 addresses