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... With the growth of the Internet and its increasing globalization,
much thought has been given to the evolution of the network number
allocation and assignment process. RFC 1174, "Identifier ...
... IR) continue as the principal registry for network
numbers; however, the IR may allocate blocks of network ...
... network
numbers; however, the IR may allocate blocks of network numbers and
the assignment of those numbers to qualified organizations. The IR
...
... registration function is desirable, and in
keeping with that goal, it is necessary to develop a plan which
manages the distribution of the network number space. The demand for
network ...
... network number space. The demand for
network numbers has grown significantly within the last two years and
as a result the allocation of network numbers must be approached in a
...
... network numbers has grown significantly within the last two years and
as a result the allocation of network numbers must be approached in a
more systematic fashion.
...
... of RFC 1174 and which defines the allocation and assignment of the
network number space. There are three major topics to be addressed:
...
... Internet Registry
3) Assignment of the Network Numbers
...
... It is important that the regional registry is unbiased and and widely
recognized by network providers and subscribers within the geographic
region. It is also important that there is just a single regional
...
... IANA and the IR
to provide the network number registration function to a geographic
area. It is possible for network ...
... network number registration function to a geographic
area. It is possible for network applicants to contact the IR
directly. Depending on the circumstances the network ...
... network applicants to contact the IR
directly. Depending on the circumstances the network subscriber may
be referred to the regional registry ...
... Class C is
approximately 12% of the total. Table 1 shows the current allocation
of the IP network numbers.
Total Allocated Allocated (%)
...
...
Class A and B network numbers are a limited resource and therefore
allocations from this space will be restricted. The entire Class A
...
... IR. No allocations
from the Class A network numbers will be made to distributed regional
registries at this time. (See section 4.1.)
...
...
Allocations from the Class B network number space will be restricted
also. Small blocks of numbers may be allocated to regional
...
... registry. It should be noted that the Reseaux IP Europeens
Network Coordination Center (RIPE NCC) had been allocated a block of
Class ...
...
The Class C network number space will be divided into allocatable
blocks which will be reserved by the IANA ...
... IR will assign addresses
to networks within those geographic areas according to the Class C
allocation divisions.
...
...
Inspection of the Class C IP network numbers shows that the number
space with prefixes 192 and 193 are assigned. The remaining space
...
... IP address range of 208.0.0.0 through
223.255.255.255. Network numbers from this portion of the Class C
space will remain unallocated and unassigned until further notice.
...
...
The remaining Class C network number space will be allocated in a
fashion which is compatible with potential address aggregation ...
...
The ranges designated as "Others" permit flexibility in network
number assignments which are outside of the geographical regions
already allocated. The range ...
... already allocated. The range listed as multi-regional represents
network numbers which have been assigned prior to the implementation
of this plan. It is proposed that the IANA and the IR ...
... IR will adopt
these divisions of the Class C network number space and will begin
assigning network ...
... Assignment of the Network Number Space ...
...
2) to assign the Class C network number space in a fashion which
is compatible with proposed address aggregation ...
... host identifier addresses and is also the class of network numbers
most sparsely populated. There are only approximately 11 Class A
...
... most sparsely populated. There are only approximately 11 Class A
network numbers which are unassigned or unreserved, and these 11
network numbers represent about 9% of the total address space ...
... network numbers which are unassigned or unreserved, and these 11
network numbers represent about 9% of the total address space.
...
... IR will retain sole responsibility for the
assignment of Class A network numbers. The upper half of the Class A
number space ...
... Class A
number space will be reserved indefinitely (IP network addresses
64.0.0.0 through 127.0.0.0). While it is expected that no new
...
... any organization petitioning the IR for a Class A network number will
be expected to provide a detailed technical justification documenting
network ...
... network number will
be expected to provide a detailed technical justification documenting
network size and structure. Class A assignments are at the IANA's
...
... Previously, organizations were recommended to use a subnetted Class B
network number rather than multiple Class C network numbers. Due to
...
... network number rather than multiple Class C network numbers. Due to
the scarcity of Class B network ...
... network numbers. Due to
the scarcity of Class B network numbers and the underutilization of
the Class B number space ...
...
The restrictions in allocation of Class B network numbers may cause
some organizations to expend additional resources to utilize multiple
Class ...
... 1) the organization presents a subnetting plan which documents
more than 32 subnets within its organizational network
AND
...
...
Organizations applying for a Class B network number must submit an
engineering plan that documents its need for a Class B network ...
... network number must submit an
engineering plan that documents its need for a Class B network
number. This document must demonstrate that it is unreasonable to
engineer its network ...
... network
number. This document must demonstrate that it is unreasonable to
engineer its network with a block of class C network numbers. The
...
... engineer its network with a block of class C network numbers. The
engineering plan must include how many hosts the network ...
... network numbers. The
engineering plan must include how many hosts the network will have
within the next 24 months and how many hosts per subnet ...
... There may be some circumstances where the organization is unable to
utilize a block of Class C network numbers and does not meet the
suggested criteria. In such cases, the engineering plan should
clearly demonstrate their inability to utilize a block of Class ...
... number space. That division is primarily an administrative division
which lays the groundwork for distributed network number registries.
This section addresses ...
... registries.
This section addresses assignment of network numbers from within
regional block assignments. Sub-allocations of the block to sub-
registries ...
... IP addresses and more than 1024 would be assigned 8 contiguous
class C network numbers from the number space reserved for European
networks ...
... network numbers from the number space reserved for European
networks, 194.0.0.0 - 195.255.255.255. If an organization from
Central America required fewer than 512 unique IP addresses and more
...
... IP addresses and more
than 256, it would receive 2 contiguous class C network numbers from
the number space reserved for Central/South American networks ...
... network numbers from
the number space reserved for Central/South American networks,
200.0.0.0 - 201.255.255.255.
...
... registration
function will determine the number of Class C network numbers to
assign to a network subscriber ...
... Class C network numbers to
assign to a network subscriber based on the subscriber's 24 month
...
... 1) requires fewer than 256 addresses 1 class C network
2) requires fewer than 512 addresses 2 contiguous class ...
... 2) requires fewer than 512 addresses 2 contiguous class C networks
3) requires fewer than 1024 addresses 4 contiguous class ...
... 3) requires fewer than 1024 addresses 4 contiguous class C networks
4) requires fewer than 2048 addresses 8 contiguous class ...
... 4) requires fewer than 2048 addresses 8 contiguous class C networks
5) requires fewer than 4096 addresses 16 contiguous class ...
... 5) requires fewer than 4096 addresses 16 contiguous class C networks
6) requires fewer than 8192 addresses 32 contiguous class ...
... 6) requires fewer than 8192 addresses 32 contiguous class C networks
7) requires fewer than 16384 addresses 64 contiguous class ...
...
If the subscriber's network is divided into logically distinct LANs
across which it would be difficult to use the given number of Class ...
... across which it would be difficult to use the given number of Class C
network numbers, the above criteria may apply on a per-LAN basis.
For example, if a subscriber ...
... subscriber could be ten Class C
network numbers; one for each Ethernet. The subscriber would have to
...
... subnet Class
C networks unneccessarily. Although, if a subscriber has a small
number of hosts ...
... subscriber should investigate the
feasibility of subnetting Class C network numbers rather than
requesting one Class C network ...
... network numbers rather than
requesting one Class C network number for every subnet. In cases
where the lack of Class ...
... requirement for more than 4096 unique IP
addresses it could conceivably receive a Class B network number.
However, there are cases where a subscriber may request a larger
...
... subscriber may request a larger
block of Class C network numbers. For instance, if an organization
requires fewer than 8192 addresses and requests 32 Class ...
... requires fewer than 8192 addresses and requests 32 Class C network
addresses, the regional registry may honor this request. The maximal
...
... registry may honor this request. The maximal
block of Class C network numbers that should be assigned to a
subscriber consists of 64 contiguous Class ...
... subscriber consists of 64 contiguous Class C networks. This would
correspond to a single IP prefix ...
...
This proliferation of class C network numbers may aid in retarding
the dispersion of class A and B numbers, but it is sure to accelerate
...
... Inherent in these recommendations is the assumption that there will
be modifications in the technology to support the larger number of
network address assignments due to the decrease in assignments of
Class ...
...
Many proposals have been made to address the rapid growth of network
assignments and a discussion of those proposals is beyond the scope
...
...
These recommendations for management of the current IP network number
space only profess to delay depletion of the IP address space, not to
...
...
Elise Gerich
Merit Network, Inc.
1071 Beal Avenue
Ann Arbor, MI 48109-2112
...