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Internet Service Provider
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... IP addresses
visible within the enterprise, since some addresses (e.g., Internet
service providers, external business partners) are outside the
address space under the control of the enterprise.
...
... to offset the overhead associated with the organization's routing
information that Internet Service Providers have to maintain, or
both."
...
... registry (e.g., InterNIC, RIPE, or
APNIC) or by an Internet Service Provider (ISP). This assignment of
a value in the most significant bit ...