Smallest RIPE NCC Allocation / Assignment Sizes	

Joćo Luis Silva Damas
Leo Vegoda
RIPE NCC 
Document ID: ripe-296 
Date: 18 November 2003

See also: ripe-256 
Obsoletes: ripe-222, ripe-242, ripe-259, ripe-264, ripe-266, ripe-269,
ripe-289, ripe-295

This document details the smallest allocations and assignments 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.

"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 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. 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         Smallest RIPE NCC 
                           Allocation                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
        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           Smallest RIPE NCC 
                           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.