Apparatus

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sensors Mode-S transponder

AA21BF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N752CX · BOEING 757-200 · operated by CARGO AIRCRAFT MANAGEMENT INC

Hex
AA21BF
Octal
52420677
Decimal
11,149,759
Country
US
Tail
N752CX
Type
B752
No current signal · last broadcast 3d ago
Flights observed
53
Distinct callsigns
8
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S AA21BF.

Country allocation

The ICAO 24-bit address AA21BF falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 8 distinct

Callsign Airline Flights Last seen
ATN731 - 11 2026-07-21
ATN460 Air Transport International 11 2026-07-23
ATN730 - 9 2026-07-20
ATN450 - 6 2026-07-22
ATN520 Air Transport International 5 2026-06-12
ATN510 Air Transport International 5 2026-06-11
ATN8752 - 4 2026-06-20
ATN101 Air Transport International 2 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 ATN460 NKW → JHB Jul 23, 03:35 UTCJul 23, 08:45 UTC5h 10m
2026-07-23 ATN460 NKW → JHB Jul 23, 02:00 UTCJul 23, 02:10 UTC10m
2026-07-22 ATN460 NKW → JHB Jul 22, 10:20 UTCJul 22, 23:15 UTC12h 55m
2026-07-22 ATN450 - Jul 22, 00:20 UTCJul 22, 05:10 UTC4h 50m
2026-07-21 ATN731 - Jul 21, 03:05 UTCJul 21, 08:15 UTC5h 10m
2026-07-21 ATN731 - Jul 21, 01:20 UTCJul 21, 01:30 UTC10m
2026-07-20 ATN731 - Jul 20, 10:30 UTCJul 20, 23:10 UTC12h 40m
2026-07-20 ATN730 - Jul 20, 05:40 UTCJul 20, 05:55 UTC15m
2026-07-19 ATN730 - Jul 19, 23:20 UTCJul 20, 04:30 UTC5h 10m
2026-07-16 ATN460 - Jul 16, 03:00 UTCJul 16, 08:00 UTC5h 0m
2026-07-15 ATN460 - Jul 15, 10:55 UTCJul 15, 23:10 UTC12h 15m
2026-07-15 ATN450 - Jul 15, 06:30 UTCJul 15, 06:55 UTC25m
2026-07-15 ATN450 - Jul 15, 00:25 UTCJul 15, 05:10 UTC4h 45m
2026-07-14 ATN731 - Jul 14, 03:10 UTCJul 14, 08:35 UTC5h 25m
2026-07-14 ATN731 - Jul 14, 01:25 UTCJul 14, 01:35 UTC10m
2026-07-13 ATN731 - Jul 13, 10:20 UTCJul 13, 23:25 UTC13h 5m
2026-07-13 ATN730 - Jul 13, 05:15 UTCJul 13, 05:25 UTC10m
2026-07-12 ATN730 - Jul 12, 23:10 UTCJul 13, 04:05 UTC4h 55m
2026-07-11 ATN460 - Jul 11, 02:55 UTCJul 11, 08:35 UTC5h 40m
2026-07-11 ATN460 - Jul 11, 01:30 UTCJul 11, 01:40 UTC10m
2026-07-10 ATN460 - Jul 10, 11:20 UTCJul 10, 22:55 UTC11h 35m
2026-07-10 ATN450 - Jul 10, 09:20 UTCJul 10, 09:30 UTC10m
2026-07-10 ATN450 - Jul 10, 02:30 UTCJul 10, 08:05 UTC5h 35m
2026-07-09 ATN731 - Jul 9, 03:30 UTCJul 9, 08:35 UTC5h 5m
2026-07-08 ATN731 - Jul 8, 22:40 UTCJul 8, 23:20 UTC40m
2026-07-08 ATN730 - Jul 8, 10:00 UTCJul 8, 10:30 UTC30m
2026-07-07 ATN730 - Jul 7, 08:50 UTCJul 7, 09:10 UTC20m
2026-07-07 ATN730 - Jul 7, 02:30 UTCJul 7, 07:35 UTC5h 5m
2026-07-01 ATN731 - Jul 1, 07:30 UTCJul 1, 08:15 UTC45m
2026-07-01 ATN731 - Jul 1, 02:55 UTCJul 1, 04:45 UTC1h 50m
2026-06-30 ATN731 - Jun 30, 10:30 UTCJun 30, 23:10 UTC12h 40m
2026-06-30 ATN730 - Jun 30, 05:20 UTCJun 30, 05:35 UTC15m
2026-06-29 ATN730 - Jun 29, 22:59 UTCJun 30, 04:10 UTC5h 11m
2026-06-27 ATN460 - Jun 27, 02:50 UTCJun 27, 07:59 UTC5h 10m
2026-06-27 ATN460 - Jun 27, 01:09 UTCJun 27, 01:24 UTC15m
2026-06-26 ATN460 - Jun 26, 10:35 UTCJun 26, 22:49 UTC12h 15m
2026-06-26 ATN450 - Jun 26, 00:15 UTCJun 26, 05:35 UTC5h 20m
2026-06-20 ATN8752 ANC → OKO Jun 20, 21:34 UTCJun 21, 04:24 UTC6h 50m
2026-06-20 ATN8752 - Jun 20, 06:10 UTCJun 20, 12:45 UTC6h 35m
2026-06-13 ATN101 WRI → ILN Jun 13, 13:35 UTCJun 13, 14:50 UTC1h 15m
2026-06-12 ATN520 THU → BWI Jun 12, 19:10 UTCJun 12, 19:50 UTC40m
2026-06-12 ATN520 THU → BWI Jun 12, 12:35 UTCJun 12, 17:30 UTC4h 55m
2026-06-11 ATN510 BWI → THU Jun 11, 07:20 UTCJun 11, 12:30 UTC5h 10m
2026-06-11 ATN510 BWI → THU Jun 11, 04:40 UTCJun 11, 05:15 UTC35m
2026-06-10 ATN510 BWI → THU Jun 10, 12:05 UTCJun 10, 13:20 UTC1h 15m
2026-06-06 ATN101 WRI → ILN Jun 6, 19:04 UTCJun 6, 20:19 UTC1h 15m
2026-06-06 ATN520 THU → BWI Jun 6, 06:10 UTCJun 6, 06:40 UTC30m
2026-06-05 ATN520 THU → BWI Jun 5, 10:10 UTCJun 6, 05:10 UTC19h 0m
2026-06-05 ATN520 THU → BWI Jun 5, 06:05 UTCJun 6, 05:10 UTC23h 5m
2026-06-05 ATN510 BWI → THU Jun 5, 02:55 UTCJun 5, 03:30 UTC35m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N752CX page for operator, model, and routing details .

Mode-S AA21BF frequently asked

What is Mode-S code AA21BF?
AA21BF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N752CX.
Where is Mode-S AA21BF registered?
Mode-S code AA21BF is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is AA21BF broadcasting right now?
No active broadcast right now. Last signal was 3d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA21BF, octal 52420677, decimal 11,149,759.
What flights does AA21BF operate?
Mode-S AA21BF has broadcast 8 distinct callsigns, including ATN731, ATN460, ATN730, ATN450, ATN520.