IANA -- 14 January 1996 -- CIDRD -------------------------------- Policy Statement on Address Space Allocations ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Regional Internet Registries (APNIC, InterNIC, RIPE NCC) refer organizations requesting IP address space to their Internet service providers (ISPs). This is done for various reasons, the main reason being that IP addresses need to be assigned heirarchically to allow aggregation of routing information (CIDR). Customers are warned of possible routing restrictions if addresses are not received from an ISP's CIDR block. Since some ISPs are presently restricting the length of prefixes they route, it is even more important for end users to receive IP addresses from their Internet service provider. Regional Internet registries have no control over the routing policies of any ISP. The IANA has instructed the Internet registries not to assign IP addresses based on any ISP's particular routing policy, rather on specific criteria including utilization efficiency. An organization will be assigned the number of IP addresses it can justify. If this number is not fully routable, that is an issue that should be taken up with the ISP(s) concerned. Regional Internet Registries inform ISPs about allocation and assignment policies. This enables ISPs to take these policies into account when setting their routing policies. s/ IANA, Internic, RIPE-NCC, AP-NIC. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~