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1. Overview

This document details the address space managed smallest allocations and assignments made by the RIPE NCC

and the longest prefixes issued from different address ranges.All

to Local Internet Registries (LIRs) and End Users from IPv4 and IPv6 address space managed CIDR blocks allocated to the RIPE NCC by the Internet Assigned Numbers Authority (IANA) and other registries.

"Smallest allocation" refers to the smallest allocation made to LIRs by the RIPE NCC.

"Smallest assignment" refers to the size of the smallest assignment made by the RIPE NCC

and the current status of each address range can be found in the extended statistics file published daily at the URL below:

https://ftp.ripe.net/pub/stats/ripencc/delegated-ripencc-extended-latest.txt Link: https://ftp.ripe.net/pub/stats/ripencc/delegated-ripencc-extended-latest.txt

2. Special Purpose Ranges

2.1. IPv6 PI Address Space

The RIPE NCC assigns IPv6 Provider Independent (PI) prefixes in accordance with the IPv6 Address Allocation and Assignment Policy Link: http://www.ripe.net/ripe/docs/ipv6-policies.html#IPv6_PI_Assignments . The IPv6 PI assignments smaller than a /32 are taken from 2001:678::/29.

3. Routing Decisions

Routing decisions are the to an End User.

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.

4. Longest Prefix Tables

The smallest prefix assigned However, network operators taking routing decisions based on prefix length are requested and encouraged to route at least blocks of sizes corresponding to the "smallest allocation" and larger.

Users receiving networks smaller than the smallest allocation size are always notified that network operators throughout the Internet may choose not to route, or may filter, these networks.

IPv4 CIDR block  Smallest RIPE NCC Allocation  Smallest RIPE NCC Assignment
62/8                /19                                 /19
80/8                /20                                 /20
81/8                /20                                 /20
82/8                /20                                 /20
83/8                /21                                 /21
84/8                /21                                 /21
85/8                /21                                 /21
86/8                /21                                 /21
87/8                /21                                 /21
88/8                /21                                 /21
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  Smallest RIPE NCC Allocation  Smallest RIPE NCC 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
2001:1A00::/23         /32                          /32
2001:4000::/23         /32                          /32
Table 1. Allocation/Assignment sizes in CIDR blocks held by the RIPE NCC from any IPv4 range is a /29.

The smallest prefix assigned by the RIPE NCC from any IPv6 range is a /48.

NCC.