Internal ARTCC subsets assigned by Enroute Safety and Operations Support. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
0021
德国
(VFR squawk code for airspace 5,000英尺(1,500米) and below prior to 15 March 2007 when replaced by the international 7000 code for VFR traffic.)[4]
0022
德国
(VFR squawk code for airspace above 5,000英尺(1,500米) – prior to 15 March 2007 when replaced by the international 7000 code for VFR traffic.)[4]
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.[6]
美国
Used exclusively by ADS-B aircraft to inhibit mode 3A transmission.[2]
美国
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 (美国).[2]
美国
External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
1100
美国
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.[2]
美国
External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
Visual flight rules (VFR) flight standard squawk code used in North American airspace when no other has been assigned or is applicable.[5][2]
1201
美国
Assigned via FAR 93.95 for use by VFR aircraft in the immediate vicinity of LAX.[2]
美国
(Visual flight rules (VFR) glider operations for gliders not in contact with ATC, through February 2012.)
1202
美国
Visual flight rules (VFR) glider operations for gliders not in contact with ATC; effective February 2012.[2]
加拿大
Visual flight rules (VFR) glider operations for gliders not in contact with ATC; effective February 2017.[5][8]
1203–1272
美国
Discrete 1200 series codes unless otherwise allocated (for example, 1255), designated for DVFR aircraft and only assigned by a flight service station.[2]
1255
美国
Aircraft not in contact with an ATC facility while enroute to/from or within the designated fire fighting area(s).[2]
VFR aircraft which fly authorized SAR missions for the 美国AF or 美国CG while enroute to/from or within the designated search area.[2][9]
1300
美国
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.[2]
美国
External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
1400
加拿大
VFR flight above 12,500' ASL when no other code has been assigned.[5]
日本
VFR flight above 10,000' MSL when no other code has been assigned.[來源請求]
美国
External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
1500
美国
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.[2]
美国
External ARTCC subset. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
1600, 1700
美国
External ARTCC subsets. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
Code squawked when entering a secondary surveillance radar (SSR) area from a non-SSR area used as uncontrolled IFR flight squawk code.[6]
EASA countries
Code that pilot shall set in the absence of ATS instructions related to code setting, unless when not receiving air traffic services.
美国
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.[2]
美国
External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2.
美国
Also for use in oceanic airspace unless another code is assigned by ATC.[2]
美国
External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
2200, 2300, 2400
美国
Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2.
美国
Also for use in oceanic airspace unless another code is assigned by ATC.[2]
美国
External ARTCC subsets. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
2500, 2600, 2700
美国
External ARTCC subsets. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
3000
澳大利亚
Civil flights in classes A, C and D airspace, or IFR flights in class E airspace.[7]
美国
External ARTCC subset. (Block of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
3100, 3200, 3300, 3400, 3500, 3600, 3700
美国
External ARTCC subsets. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
4000
澳大利亚
Civil flights not involved in special operations or SAR, operating in class G airspace in excess of 15NM offshore.[7]
美国
Aircraft on a VFR Military Training Route or requiring frequent or rapid changes in altitude.[10]
美国
Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2.
美国
Also for use in oceanic airspace unless another code is assigned by ATC.[2]
美国
External ARTCC subsets. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
4100
美国
External ARTCC subsets. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
4200, 4300
美国
Internal ARTCC subsets assigned by Enroute Safety and Operations Support. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
4400–4477
美国
Reserved for use by SR-71, YF-12, U-2, B-57, pressure suit flights, and aircraft operations above FL600.[2][10]
4401–4433
美国
Reserved in accordance with FAA Order JO 7110.67 (Federal Law Enforcement).[2]
Operations above FL600 for Lockheed/NASA from Moffett Field.[2]
4442–4446
美国
Operations above FL600 for Lockheed from Air Force Plant 42.[2]
4447–4452
美国
Operations above FL600 for SR-71/U-2 operations from Edwards AFB.[2]
4453
美国
High balloon operations: National Scientific Balloon Facility in Palestine, Texas; and other providers, some in international operations.[2]
4454–4465
美国
Air Force operations above FL600 as designated in FAA Order 7610.4.[2]
4466–4477
美国
Reserved in accordance with FAA Order JO 7110.67 (Federal Law Enforcement).[2]
4500, 4600, 4700
美国
Internal ARTCC subsets assigned by Enroute Safety and Operations Support. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
Internal ARTCC subsets assigned by Enroute Safety and Operations Support. (Blocks of discrete codes except that xx00 is used as a non-discrete code after all discrete codes are assigned.)[2]
5100–5300
美国
May be used by DOD aircraft beyond radar coverage but inside 美国 controlled airspace with coordination as appropriate with applicable Area Operations Directorate.[2]