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concerned.
7f 11/96
No. 71
CHAPTER 9. AIRCRAFT ADDRESSING SYSTEM
9.1 The aircraFt address shall be one of 16 777 214 twenty-fow-bit aircraft addresses allocated by ICAO to the State of
Registry or common mark registering authority and assigned as prescribed in the Appendix to this Chapter.
ANNEX 10 - VOLUME 111
7/11/96
No. 71
APPENDIX TO CHAPTER 9. A WORLD-WIDE SCHEME FOR
THE ALLOCATION, ASSIGNMENT AND
APPLICATION OF AIRCRAFT ADDRESSES
1. General Addresses starting with bit combination 00101: SAM region
1.1 Global communications, navigation and s-eillance Addresses starting with bit combination 0101: EUR and NAT
systems shall use an individual aircraft address composed of regions
24 bits. At any one time, no address shall be assigned to more
than one aircraft. The assignment of aircraft addresses requires Addresses starting with bit combination 01 100: MLD region
a comprehensive scheme providing for a balanced and expandable
distribution of aircraft addresses applicable world-wide. Addresses starting with bit combination 01 101: SEA region
Addresses starting with bit combination 1001: NAM and PAC
regions
2. Description of the scheme Addresses starting with bit combination 11 101 1 : CAR region
2.1 ~ ~9-1b prlovid~es f or blocks of consecutive In addition, aircraft addresses starting with bit combinations
addrcsscs available to States for assignment to aircraft. Each 101 1. 1101 and 1 11 1 have been reserved for future use.
block is defined by a Iixed pattern of the first 4, 6, 9, 12 or 14
bits of the 24-bit address. Thus, blocks of different sizes 4.4 Any future requirement for additional aircfaft
(1 048 576, 262 144, 32 768, 4 096 and 1 024 consecutive addresses shall be accommodated through co-ordination
addresses respectively) are made available. between ICAO and the States of Registry or common mark
registering authority concerned. A request for additional
aircraft addresses shall only bc made by a registering authority
when at least 75 per cent of the number of addresses already
allocated to that registering authority have been assigned to
3. Management of the scheme aircraft.
3.1 The International Civil Aviation Organization 4.5 ICAO shall allocate blocks of aircraft addresses to
(ICAO) shall administer the scheme so that appropriate non-~onwactinsgt ateusp on request,
international distribution of aircraft addresses can be
maintained.
5. Assignment of
aircraft addresses
4. Allocation of
aircraft addresses
4.1 Blocks of aircraft addresses shall be allocated by
ICAO to the State of Registry or common mark registering
authority. Address allocations to States shall be as shown in
Table 9-1.
4.2 A State of Registry or common mark registering
authority shall notify ICAO when allocation to that State of an
additional block of addresses is required for assignment to
aircraft.
5.1 When required for use by suitably equipped aircraft
entered on a national or international register, individual
aircraft addresses within each block shall be assigned to
aircraft by the State of Registry or common mark registering
authority.
5.2 Aircraft addresses shall be assigned to aircraft in
accordance with the following principles:
a) at any one time, no address shall be assigned to more
than one aircraft;
4.3 In the future management of the scheme, advantage b) only one address shall be assigned to an aircraft,
shall be taken of the blocks of aircraft addresses not yet irrespective of the composition of equipment on board;
allocated. These spare blocks shall be distributed on the basis
of the relevant ICAO region: c) the addrcss shall not be changed except under
exceptional circumstances and shall not be changed
Addresses starting with bit combination 00100: AFI region during flight;
7/11/96
No. 71 ANNEX 10 - VOLUME 111
Annex 10 - Aeronautical Telecommunications
d) when an aircraft changes its State of Registry, the
previously assigned address shall be relinquished and
a new address shall be assigned by the new registering
authority;
e) the address shall serve only a technical role for
addressing and identification of aircraft and shall not
be used to convey any specific information; and
f) the addresses composed of 24 ZEROS or 24 ONES
shall not be assigned to aircraft.
6. Application of
aircraft addresses
6.1 The aircraft addresses shall be used in applications
which require the routing of information to or from individual
suitably equipped aircraft.
Note I.- Examples of such applications are the
aeronautical telecommunication network (ATN), SSR Mode S
and airborne collision avoidance system (ACAS).
　
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