Smallest RIPE NCC Allocation / Assignment Sizes
Joao Luis Silva Damas
Leo Vegoda
RIPE NCC 

Document ID: ripe-264
Date: 8 November 2002 
Obsoletes: ripe-222, ripe-242, ripe-259

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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).

"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.

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 to whom small blocks (smaller than the default allocation size)
of PI IPv4 addresses and IPv6 assignments to IXPs are given out are
always notified that network operators throughout the Internet may
choose not to route, or may filter, small address blocks if they are
not aggregated into larger blocks.

IPv4 CIDR block 	Default RIPE NCC	    Smallest RIPE NCC 
			   Allocation	    	Allocation / Assignment 
	 62/8 			/19 			/19 
	 80/8 	 		/20 			/20 
	 81/8 			/20 			/20 
	193/8 			/19 			/29 
	194/8 			/19 			/29 
	195/8 			/19 			/29 
	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 			/35

2001:0A00::/23			/32			/48
 
Table 1. Allocation/Assignment sizes in CIDR blocks held by the RIPE NCC.