Discussion in 'Routing & Switching' started by bsange, May 10, 2017.

  1. bsange

    bsange New Member

    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

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