APNIC is a non-profit membership organization responsible for the administration
and registration of Internet Protocol (IP) addresses in the Asia-Pacific
region, including Japan, Korea, China, and Australia.
ARIN is a non-profit membership organization established for the purpose
of the administration and registration of Internet Protocol (IP) addresses
in the geographical areas previously managed by Network Solutions, Inc.
Those areas include North America, South America, the Caribbean and sub-Saharan
The IANA is the authority originally responsible
for the oversight of IP address allocation, the coordination of the assignment
of protocol parameters provided for in Internet technical standards, and
the management of the DNS, including the delegation of top-level domains
and oversight of the root name server system. Under ICANN, the IANA continues
to distribute addresses to the Regional Internet Registries, coordinate
with the IETF and others to assign protocol parameters, and oversee the
operation of the DNS.
RIPE is an open and voluntary organization
which consists of European Internet service providers. The RIPE NCC acts
as the Regional Internet Registry (RIR) for Europe and surrounding areas,
performs coordination activities for the organizations participating in
RIPE, and allocates blocks of IP address space to its Local Internet Registries
(LIRs), which then assign the addresses to end-users.