Internet service
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... Conservation: Fair distribution of globally unique Internet address
space according to the operational needs of the end-users and Internet
Service Providers operating networks using this address space.
...
... "Conservation" and "Routability" are often conflicting goals. All
the above goals may sometimes be in conflict with the interests of
individual end-users or Internet service providers. Careful analysis
and judgement is necessary in each individual case to find an
appropriate compromise.
...
... This requires consensus within the Internet community of the
region. A consensus of Internet Service Providers in that region
may be necessary to fulfill that role.
...
... Guidelines for Internet Service Providers (ISPs) ...