IPv6 addresses use 128 bits to represent an address which includes bits to be used for subnetting. The second half of the address (least significant 64 bits) is always used for hosts only. Therefore, there is no compromise if we subnet the network.
For example if a given IPv6 address is
2001:0308:607c:003e:0000:0000:0000:0002 with 64 bits for host portion.
You can replace all highlighted blocks of Zero with :: which simplify this to 2001:0308:607c:003e::0002.
Also you can ignore leading zeros of a given block of 4 hex digits.
So this can be written as 2001:308:607c:3e::2/64.
There are different type of IPv6 addresses assigned by IANA.
1. Link Local – FE80::/64
2. Unique Local – FC00::/7
3. Global – 2000::/3
4. Multicast – FF00::/8
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