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`I have three main buildings with building A with 242 end devices, building B with 54 end devices and building C with 894 device. And all the routers are connected to each other like ring topology. The given IP is FC00:abcd:1234::/48. How can I do the subnetting with given parameters please help me. Topology

Note- the interface between The routers also needed to be subnetted. `

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    By the way, you cannot use the FC00:abcd:1234::/48 prefix. The first half of ULA, fc00::/8, is Reserved. The second half, fd00::/8, is available for you to use, but you must choose 40 random bits to follow, giving you a relatively unique (remember that the U in ULA means Unique) /48 prefix.
    – Ron Maupin
    Aug 6, 2023 at 20:28

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Just use a /64 for every network, don't overthink it. And with a /48 you have more than enough /64's to use one for every network and use one /64 to split into /127's for point to point links.

If you use anything other than a /64 on an IPv6 network, some things (like SLAAC) will not work properly.

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  • Can you be more specific and give me the full ranges for each network and interface I really need this and this is very imp to me Aug 6, 2023 at 20:02
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    I'm not here to do your work. If you do not know how to do IPv6 subnet calculation, I suggest you look into that, so you actually understand what you're doing instead of just copy/pasting someone's suggestions.
    – Teun Vink
    Aug 6, 2023 at 20:20
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    This is starting to feel like a educational/homework question. Please note that these are off topic here.
    – Teun Vink
    Aug 6, 2023 at 20:20

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