Provider
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... ISPs should request address
space directly from its upstream provider. ISPs only request address
space directly from regional registries ...
...
Note that addresses issued directly from the IRs (non-provider
based), are the least likely to be routable across the Internet.
...
... Internet connectivity contract, e.g., the customer
moves to another service provider, it is recommended the
customer return the network ...
... network addresses currently in use and
renumber into the new provider's address space. The ISP
...
... security problems,
b) to ensure that a provider has exhausted a majority of its
current CIDR allocation, thereby justifying an additional
...
... connection is established. Note that
addresses issued directly from the IRs,(non-provider based), are the
least likely to be routable across the Internet.
...
... addresses obtained directly from regional registry
(provider-independent, also known as portable) are not
guaranteed routable on the Internet.
...
... resource records for networks not associated with a
specific provider will continue to be maintained by the regional
registry.
...