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ripe-136: European ripe-072: RIPE NCC Internet Registry Policies And Numbers Registration Procedures

insert:  This RIPE Document documents obsoletes ripe-65, version 0.6 of this document insert:  insert:  
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Abstract insert:  
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This document describes the procedures for the reassignment of IP insert:  
network numbers from blocks obtained from the RIPE Network Coordination insert:  
Centre. It deals with items as providing information for the RIPE insert:  
database, as well as reassignment of IP addresses in light of insert:  
the "Supernetting" proposal, as documented in RFC 1338, by Vince Fuller insert:  
et al. insert:  
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Introduction insert:  
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Since May 1st 1992, the RIPE Network Coordination Centre (NCC) is available in ASCII insert:  
acting as a delegated registry for IP networks numbers to NICs and PDF NOCs insert:  
in Europe. It is RIPE NCC policy not to give out network numbers to insert:  
individual organisations, who should refer in turn, to their IP network insert:  
service provider. insert:  
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The mission of the RIPE NCC is to give network numbers to the various insert:  
service providers and NICs. The NICs and NOCs can then reassign the insert:  
actual IP network numbers to organisations requesting IP network insert:  
numbers. insert:  
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Class B Network Number Allocation Procedure insert:  
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Service providers can request Class B network numbers on a one-by-one insert:  
basis from the RIPE NCC. Because class B address space is a critical insert:  
resource, a request for a class B network number must be accompanied by insert:  
a justification in terms of the requesting organisation's size, current insert:  
network and expected network growth. The requestor should also make insert:  
clear why they cannot use a block of class C network numbers to achieve insert:  
their goals. The RIPE NCC will review requests using the same standards insert:  
as any other Internet Registry, particularly the US NIC. insert:  
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Class C Allocation Procedures insert:  
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NICs and NOCs accepting a block of class C numbers agree to adhere to insert:  
the following procedures: insert:  
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A) The RIPE NCC will assign complete class C blocks to individual NICs insert:  
and NOCs. They can be requested from <[email protected]>. insert:  
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B) In order to prevent implementation problems, network numbers ending insert:  
with 0 or 255 should NOT be reassigned. insert:  
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C) Full information about reassigned network numbers must be reported insert:  
back to the RIPE NCC in full RIPE database format (ref ripe-13). insert:  
The complete entries should be sent immediately after reassignment to insert:  
<[email protected]>. insert:  
The RIPE NCC is ready to accept block entries for the RIPE database. insert:  
For block syntax, please contact the RIPE NCC. insert:  
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D) Reassignment of class C network numbers should be done in a manner insert:  
that facilitates Supernetting (see next section). insert:  
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E) Requests for network numbers should be reasonable. All NICs and NOCs insert:  
should prevent stockpiling of network numbers. insert:  
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F) On first request from the RIPE NCC, the class C network numbers not insert:  
yet reassigned, must be returned to the RIPE NCC. insert:  
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Supernetting insert:  
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NICs and NOCs reassigning IP network numbers are urgently requested to insert:  
read the Supernetting proposal by Vince Fuller et al. This document can insert:  
be obtained from the rfc section of the RIPE document store or other RFC insert:  
servers. It is called rfc1338.txt. insert:  
The Supernetting proposal was made to reduce the increase of routing insert:  
table size in the current Internet. It proposes to create a hierarchy insert:  
of IP network numbers, which can then be aggregated resulting in less insert:  
routing table entries in routing equipment. While this proposal has not insert:  
been formally adopted we expect that something at least along the same insert:  
principle will be implemented in the near future. insert:  
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Here is how it works: insert:  
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If an organisation A needs 8 class C network numbers, the numbers should insert:  
be given out in such a way that the routing information for each of insert:  
these 8 networks could appear as one entry with the correct mask in insert:  
routers. insert:  
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More concretely: insert:  
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Service provider S hands out networks 192.24.8 through 192.24.15 to insert:  
organisation A. These networks can then appear in routing equipment as a insert:  
supernet route to 192.24.8 with mask 255.255.248.0. This way 8 class C insert:  
network numbers appear as one routing table entry. insert:  
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The guidelines that can be derived from the Supernetting proposal are: insert:  
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A) Service providers should reserve blocks of class C network numbers from insert:  
their allocation for each organisations requesting class C network numbers. insert:  
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B) The size of these blocks should always be a power of 2. insert:  
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C) The numbers in these blocks should be contiguous. insert:  
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D) The blocks should start on bit boundaries. insert:  
(ie powers of 2, AND multiples of the block size) insert:  
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E) The blocks reserved for an organisation should be sufficient for a insert:  
reasonable expected growth over the next few years. insert:  
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F) Multi-homed organizations may obtain address space from one of their insert:  
providers, the RIPE NCC, or the global NIC, as is appropriate to their insert:  
network configuration. These organisations are strongly encouraged to insert:  
contact the RIPE NCC for guidance. insert:  
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If you have any questions concerning this, please do not hesitate to insert:  
call or mail us at [email protected]