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.