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Determine Network Portion and Host portion of IPV6 IP

Determine Network Portion and Host portion of IPV6 IP

Let' say I have this IPV6 IP address.

2001:1234:5678:1234:5678:ABCD:EF12:1234/64

in this case : 2001:1234:5678:1234 is the Network portion and 5678:ABCD:EF12:1234 is the host portion

that one is easy to find.
How about when the CIDR is for instance 53.
Example:

2001:1234:5678:1234:5678:ABCD:EF12:1234/53

Where is the Network portion and where is the host portion ? how do you calculate it ?

Thanks

Qlemo

/53 tells you that exactly 53 bits from left are the network part. What's left is the host portion.
But IIRC there is no network portion with less than 64 bits for IPv6 ...

SOLUTION

noci

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Qlemo

noci, /53 is building a bigger network than /64, not a smaller one :D. But you are still correct. You can do subnetting by adding bits to /64, because that is completely your realm. Public routing happens only for /64, offcially.

jskfan

ASKER

So can we determine which part is Network and which is host using /53 or it goes just by multiple of 16 slices. ?

SOLUTION

Qlemo

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ASKER CERTIFIED SOLUTION

noci

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