– 2003::/3 ; is reserved for global unicast
– /12 is allocated from IANA to RIRs
– /32 is allocated from RIRs to ISPs
– /48 is allocated from ISPs to end-sites
* RIR approval is required for ISPs to allocate multiple /48s to single site
** /64 can be allocated if single site only requires one subnet
*** /128 can be allocated if end site requires only one IP address<
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