Smallest RIPE NCC Allocation / Assignment Sizes Joćo Luis Silva Damas Leo Vegoda RIPE NCC Document ID: ripe-295 Date: 15 October 2003 See also: ripe-256 Obsoletes: ripe-222, ripe-242, ripe-259, ripe-264, ripe-266, ripe-269, ripe-289 This document contains the size of the minimum and default allocations made by the RIPE NCC to Local Internet Registries (LIRs) and End Users from IPv4 and IPv6 CIDR blocks allocated to the RIPE NCC by the Internet Assigned Numbers Authority (IANA) and other registries. "Default allocation" refers to the amount of addresses, in prefix notation, that are allocated to LIRs by default. "Smallest assignment" refers to the size of the smallest assignment, in prefix notation, made by the RIPE NCC to an End User. Allocations or Assignments smaller than the default size have been made to users requesting Provider Independent (PI) IPv4 address space. Small IPv6 blocks have been assigned to Internet Exchange Points (IXPs) under the interim policy allowing this. From October 2003, IPv4 allocations and assignments to LIRs and End Users in African countries north of the equator will be made from 196.200.0.0/13. This range is part of a /8 block also used by the American Registry for Internet Numbers (ARIN) for African allocations. Because the longest prefix ARIN allocate or assign for 196/8 is /24 this is also the longest prefix the RIPE NCC will assign from 196.200.0.0/13. Routing decisions for blocks of address space are the sole responsibility of network operators. However, network operators taking routing decisions based on prefix length are requested and encouraged to route at least blocks of sizes corresponding to the "default allocation" and larger. Users receiving networks smaller than the default allocation size are always notified that network operators throughout the Internet may choose not to route, or may filter, these networks. IPv4 CIDR block Default RIPE NCC Smallest RIPE NCC Allocation Allocation / Assignment 62/8 /19 /19 80/8 /20 /20 81/8 /20 /20 82/8 /20 /20 193/8 /19 /29 194/8 /19 /29 195/8 /19 /29 196.200/13 /20 /24 212/8 /19 /19 213/8 /19 /19 217/8 /20 /20 IPv6 CIDR block Default RIPE NCC Smallest RIPE NCC Allocation Allocation / Assignment 2001:0600::/23 /35 /48 2001:0800::/23 /32 /32 2001:0A00::/23 /32 /32 2001:1400::/23 /32 /32 2001:1600::/23 /32 /32 Table 1. Allocation/Assignment sizes in CIDR blocks held by the RIPE NCC.