List of transponder codes

The following list shows specific aeronautical transponder codes, and ranges of codes, that have been used for specific purposes in various countries. Traditionally each country has allocated transponder codes by their own scheme with little commonality across borders. The list is retained for historic interest.

Pilots are normally required to apply the code, allocated by air traffic control, to that specific flight. Occasionally countries may specify generic codes to be used in the absence of an allocated code. Such generic codes are specified in that country's Aeronautical Information Manual or Aeronautical Information Publication.

CodeAllocated use
0000
  • Shall not be used — is a non-discrete mode A code (Europe)[1]
  • Mode C or other SSR failure (UK)[2]
  • Should never be assigned (USA)[3]
  • Military intercept code (USA)[4]
  • Internal ARTCC subsets assigned by En Route Safety and Operations Support (Discrete codes only except for first primary block to be used as non-discrete if all discrete codes are assigned) (USA)[3]
0021
  • VFR squawk code for airspace 5,000 feet (1,500 m) and below — from 15 March 2007 replaced by the international 7000 code for VFR traffic (Germany)[5]
0022
  • VFR squawk code for airspace above 5,000 feet (1,500 m) — from 15 March 2007 replaced by the international 7000 code for VFR traffic (Germany)[5]
0025
  • Parachute dropping in progress (Germany)
0033
  • Parachute dropping in progress (UK)[2]
0041-0057
  • Assigned for VFR traffic under Flight Information Services (BXL FIC) (Belgium)
0100
  • Flights operating at aerodromes (in lieu of codes 1200, 2000 or 3000 when assigned by ATC or noted in the Enroute Supplement (Australia))[6]
0100-0400
  • Allocated to Service Area Operations for assignment for use by Terminal/CERAP/Industry/Unique Purpose/Experimental Activities (USA)[3]
0100-0700
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
0500, 0600, 0700
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
1000
  • Instrument Flight Rules (IFR) flight below 18,000' when no other code has been assigned (Canada)[7]
  • Non-discrete mode A code reserved use in Mode S radar/ADS-B environment where the aircraft identification will be used to correlate the flight plan instead of the mode A code (ICAO)[1]
  • Used exclusively by ADS-B aircraft to inhibit Mode 3A transmit (USA)[3]
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
1100
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
1200
  • Civil VFR flights in class E or G airspace (Australia)[6]
  • Visual flight rules (VFR) flight, this is the standard squawk code used in North American airspace when no other has been assigned (Canada and USA)[7][3]
1201
  • Visual flight rules (VFR) glider operations for gliders not in contact with ATC, through February 2012 (USA)[8]
  • Assigned via FAR 93.95 for use by VFR aircraft in the immediate vicinity of LAX (USA)[3]
1202
1203-1272
  • Discrete 1200 series codes, unless otherwise allocated (for example, 1255), designated for DVFR aircraft and only assigned by FSS (USA)[3]
1255
  • Aircraft not in contact with an ATC facility while en route to/from or within the designated fire fighting area(s) (USA)[3][10]
1273-1275
  • Calibration Performance Monitoring Equipment (CPME) "Parrot" transponders (USA)[3]
1276
1277
  • VFR aircraft which fly authorized SAR missions for the USAF or USCG while en route to/from or within the designated search area (USA)[3][10]
1300
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
1400
  • VFR flight above 12,500' ASL when no other code has been assigned (Canada)[7]
  • VFR flight above 10,000' MSL when no other code has been assigned (Japan)
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
1500
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
1600, 1700
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
2000
  • Civil IFR flights in Class G airspace (Australia)[6]
  • Uncontrolled IFR at or above 18,000' (Canada)[7]
  • The code to be squawked when entering a secondary surveillance radar (SSR) area from a non-SSR area used as Uncontrolled IFR flight squawk code (ICAO countries)[1]
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
2100
  • Ground testing by aircraft maintenance staff (Australia)[6]
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
2200, 2300, 2400
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
2500, 2600, 2700
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
3000
  • Civil flights in classes A, C and D airspace, or IFR flights in Class E airspace (Australia)[6]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
3100, 3200, 3300, 3400, 3500, 3600, 3700
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
4000
  • Civil flights not involved in special operations or SAR, operating in Class G airspace in excess of 15NM offshore (Australia)[6]
  • Aircraft on a VFR Military Training Route or requiring frequent or rapid changes in altitude (USA)[11]
  • Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2 *Also for use in oceanic airspace, unless another code is assigned by ATC (USA)[3]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
4100
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
4200, 4300
  • Internal ARTCC subsets assigned by En Route Safety and Operations Support (Discrete codes only except for first primary block to be used as non-discrete if all discrete codes are assigned) (USA)[3]
4400-4477
4401-4433
  • Reserved in accordance with FAA Order JO 7110.67 (Fed Law Enforcement) (USA)[3]
4434-4437
  • Weather reconnaissance, as appropriate (USA)[3]
4440-4441
  • Operations above FL600 for Lockheed/NASA from Moffett Field (USA)[3]
4442-4446
  • Operations above FL600 for Lockheed from Air Force Plant 42 (USA)[3]
4447-4452
  • Operations above FL600 for SR-71/U-2 operations from Edwards AFB (USA)[3]
4453
  • High balloon operations – National Scientific Balloon Facility, Palestine TX, and other providers, some in international operations (USA)[3]
4454-4465
  • Air Force operations above FL600 as designated in FAA Order 7610.4 (USA)[3]
4466-4477
  • Reserved in accordance with FAA Order JO 7110.67 (Fed Law Enforcement) (USA)[3]
4500, 4600, 4700
  • Internal ARTCC subsets assigned by En Route Safety and Operations Support (Discrete codes only except for first primary block to be used as non-discrete if all discrete codes are assigned) (USA)[3]
5000
  • Aircraft flying on military operations (Australia)[6]
5000
  • Reserved for use by NORAD (USA and Canada)[3]
5061-5062, 5100, 5200
  • Reserved for special use by Potomac TRACON (USA)[3]
5100, 5200, 5300, 5500
  • Internal ARTCC subsets assigned by En Route Safety and Operations Support (Discrete codes only except for first primary block to be used as non-discrete if all discrete codes are assigned) (USA)[3]
5100-5300
  • May be used by DOD aircraft beyond radar coverage but inside US controlled airspace with coordination as appropriate with applicable Area Operations Directorate (USA)[3]
5400
  • Reserved for use by NORAD (USA and Canada)[3]
5600, 5700
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
6000
  • Military flights in Class G airspace (Australia)[6]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
6100
  • Reserved for use by NORAD (USA and Canada)[3]
6200, 6300
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
6400
  • Reserved for use by NORAD (USA and Canada)[3]
6500, 6600, 6700
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
7000
  • VFR standard squawk code when no other code has been assigned (ICAO)[1]
  • This code does not imply VFR; 7000 is used as a general conspicuity squawk (UK)[2]
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
  • Unmanned aerial vehicle in all classes of airspace and when instructed to enable transponder (Australia)[6]
7001
  • Used in some countries to identify VFR traffic (France)
  • Sudden military climb out from low-level operations (UK)[2]
7004
7100, 7200, 7300
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
  • 7100 in Switzerland for SAR (REGA)[12]
7400
7500
7501-7577
  • Reserved for use by Continental NORAD Region (CONR) (USA)[3]
7600
7601-7607
  • Reserved for special use by FAA (USA)[3]
7610-7676
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
7615
  • Civil flights engaged in littoral surveillance (Australia)[6]
7700
  • Emergency (ICAO, worldwide)[7][3]
7701-7707
  • Reserved for special use by FAA (USA)[3]
7710-7776
  • External ARTCC subsets (Discrete codes of blocks only except for first primary block, which is used as the ARTCC's non-discrete code if all discrete codes are assigned) (USA)[3]
7777
  • Non-discrete code used by fixed test transponders (RABMs) to check correctness of radar stations (BITE) (Belgium, Germany, Netherlands, USA)
  • DOD interceptor aircraft on active air defense missions and operating without ATC clearance in accordance with FAA Order 7610.4 (USA)[3][15]

References

  1. 1 2 3 4 ICAO doc 4444 & ICAO Annex 10
  2. 1 2 3 4 5 "UK AIP ENR 1.6.2 — SSR Operating Procedures and UK SSR Code Assignment Plan" (PDF). UK Civil Aviation Authority. 2007-11-06. Archived from the original (PDF) on 2009-01-24.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 US Department of Transportation, Federal Aviation Administration. "JO 7110.66D, National Beacon Code Allocation Plan". US Government. Retrieved 2012-04-26.
  4. ↑ "Radio Communications". Cleared for Takeoff: Your Handbook for Becoming a Private Pilot (Revision E ed.). King Schools, Inc. 2006. pp. 4–16.
  5. 1 2 "Change of German VFR transponder codes A/C 7000 replaces A/C 0021 and A/C 0022". SkyControl Aviation & Aerospace News. 2007-11-06.
  6. 1 2 3 4 5 6 7 8 9 10 Australian AIP ENR 1.6 para 7.1.4
  7. 1 2 3 4 5 6 7 Transport Canada (2010-05-20). "TP 14371 — Transport Canada Aeronautical Information Manual (TC AIM) RAC 1.9 Transponder Operation". Archived from the original on 2010-07-09. Retrieved 2010-08-21.
  8. ↑ FAA ORDER/PUBLICATION: 7110.65U dated 2011-ß5-18
  9. ↑ FAA ORDER/PUBLICATION 7110.65V dated 2014-02-19
  10. 1 2 FAA order JO 7110.65U
  11. 1 2 "FAA Order 7110.65R (Air Traffic Control procedural manual) — chapter 5.2, Beacon Systems". Federal Aviation Authority. 2008-01-21.
  12. ↑ "DZ Transponder Codes/Separations Flashcards - Quizlet". quizlet.com. Retrieved 2016-07-21.
  13. ↑ https://www.faa.gov/documentLibrary/media/Notice/N_JO_7110.724_5-2-9_UAS_Lost_Link.pdf
  14. ↑ Australian AIP ENR 1.6 para 6.4.6
  15. ↑ "Aeronautical Information Manual, chapter 4 — Air Traffic Control". Federal Aviation Administration. 2007-11-06.
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