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sensors Mode-S transponder

AA421B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N760FX · CESSNA 408 SkyCourier · operated by FEDERAL EXPRESS CORP

Hex
AA421B
Octal
52441033
Decimal
11,158,043
Country
US
Tail
N760FX
Type
C408
No current signal · last broadcast 8d ago
Flights observed
98
Distinct callsigns
5
Country
US
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S AA421B.

Country allocation

The ICAO 24-bit address AA421B 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 5 distinct

Callsign Airline Flights Last seen
MTN8520 - 27 2026-06-04
MTN7520 - 27 2026-06-04
MTN8380 - 22 2026-07-24
MTN7369 - 20 2026-07-24
N760FX - 2 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 MTN8380 - Jul 24, 09:55 UTCJul 24, 11:50 UTC1h 55m
2026-07-24 MTN7369 - Jul 24, 04:40 UTCJul 24, 04:55 UTC15m
2026-07-24 MTN7369 - Jul 24, 03:20 UTCJul 24, 04:05 UTC45m
2026-07-23 MTN8380 - Jul 23, 13:55 UTCJul 23, 14:30 UTC35m
2026-07-23 MTN8380 - Jul 23, 10:00 UTCJul 23, 12:50 UTC2h 50m
2026-07-23 MTN7369 - Jul 23, 03:20 UTCJul 23, 04:55 UTC1h 35m
2026-07-22 MTN8380 - Jul 22, 11:25 UTCJul 22, 12:25 UTC1h 0m
2026-07-22 MTN7369 - Jul 22, 03:15 UTCJul 22, 04:55 UTC1h 40m
2026-07-21 MTN8380 - Jul 21, 10:15 UTCJul 21, 11:55 UTC1h 40m
2026-07-21 MTN7369 DHN → MEM Jul 21, 03:20 UTCJul 21, 05:05 UTC1h 45m
2026-07-17 MTN8380 - Jul 17, 10:40 UTCJul 17, 11:15 UTC35m
2026-07-17 MTN8380 - Jul 17, 09:50 UTCJul 17, 10:05 UTC15m
2026-07-17 MTN7369 - Jul 17, 03:25 UTCJul 17, 05:20 UTC1h 55m
2026-07-16 MTN8380 - Jul 16, 09:50 UTCJul 16, 11:20 UTC1h 30m
2026-07-16 MTN7369 - Jul 16, 04:55 UTCJul 16, 05:05 UTC10m
2026-07-16 MTN7369 - Jul 16, 03:25 UTCJul 16, 04:20 UTC55m
2026-07-15 MTN8380 - Jul 15, 11:05 UTCJul 15, 11:35 UTC30m
2026-07-15 MTN8380 - Jul 15, 10:00 UTCJul 15, 10:20 UTC20m
2026-07-15 MTN7369 - Jul 15, 03:20 UTCJul 15, 05:00 UTC1h 40m
2026-07-14 MTN8380 - Jul 14, 10:20 UTCJul 14, 11:55 UTC1h 35m
2026-07-14 MTN7369 - Jul 14, 03:30 UTCJul 14, 05:15 UTC1h 45m
2026-07-10 MTN8380 - Jul 10, 10:50 UTCJul 10, 11:35 UTC45m
2026-07-10 MTN8380 - Jul 10, 09:55 UTCJul 10, 10:15 UTC20m
2026-07-10 MTN7369 - Jul 10, 03:10 UTCJul 10, 04:55 UTC1h 45m
2026-07-09 MTN8380 - Jul 9, 10:50 UTCJul 9, 11:35 UTC45m
2026-07-09 MTN8380 - Jul 9, 10:00 UTCJul 9, 10:15 UTC15m
2026-07-09 MTN7369 - Jul 9, 03:20 UTCJul 9, 05:05 UTC1h 45m
2026-07-08 MTN8380 - Jul 8, 10:05 UTCJul 8, 11:40 UTC1h 35m
2026-07-08 MTN7369 - Jul 8, 03:05 UTCJul 8, 04:45 UTC1h 40m
2026-07-07 MTN8380 - Jul 7, 10:15 UTCJul 7, 11:55 UTC1h 40m
2026-07-07 MTN7369 - Jul 7, 04:25 UTCJul 7, 04:45 UTC20m
2026-07-07 MTN7369 - Jul 7, 03:05 UTCJul 7, 03:50 UTC45m
2026-07-03 MTN8380 - Jul 3, 11:00 UTCJul 3, 11:40 UTC40m
2026-07-03 MTN8380 - Jul 3, 09:55 UTCJul 3, 10:20 UTC25m
2026-07-03 MTN7369 - Jul 3, 03:45 UTCJul 3, 05:25 UTC1h 40m
2026-07-02 MTN8380 - Jul 2, 10:20 UTCJul 2, 12:05 UTC1h 45m
2026-07-02 MTN7369 - Jul 2, 03:15 UTCJul 2, 05:05 UTC1h 50m
2026-07-01 MTN8380 - Jul 1, 10:15 UTCJul 1, 12:00 UTC1h 45m
2026-07-01 MTN7369 - Jul 1, 03:30 UTCJul 1, 04:55 UTC1h 25m
2026-06-30 MTN8380 - Jun 30, 10:45 UTCJun 30, 12:25 UTC1h 40m
2026-06-30 MTN7369 - Jun 30, 04:30 UTCJun 30, 05:10 UTC40m
2026-06-30 MTN7369 - Jun 30, 03:20 UTCJun 30, 04:00 UTC40m
2026-06-25 N760FX - Jun 25, 14:50 UTCJun 25, 15:04 UTC15m
2026-06-05 N760FX - Jun 5, 09:40 UTCJun 5, 10:10 UTC30m
2026-06-04 MTN8520 - Jun 4, 06:05 UTCJun 4, 07:05 UTC1h 0m
2026-06-04 MTN7520 - Jun 4, 02:15 UTCJun 4, 03:20 UTC1h 5m
2026-06-03 MTN8520 - Jun 3, 05:55 UTCJun 3, 07:00 UTC1h 5m
2026-06-03 MTN7520 - Jun 3, 02:05 UTCJun 3, 03:10 UTC1h 5m
2026-06-02 MTN8520 - Jun 2, 06:15 UTCJun 2, 07:25 UTC1h 10m
2026-06-02 MTN7520 - Jun 2, 02:05 UTCJun 2, 03:10 UTC1h 5m

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 N760FX page for operator, model, and routing details .

Mode-S AA421B frequently asked

What is Mode-S code AA421B?
AA421B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N760FX.
Where is Mode-S AA421B registered?
Mode-S code AA421B 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 AA421B broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA421B, octal 52441033, decimal 11,158,043.
What flights does AA421B operate?
Mode-S AA421B has broadcast 5 distinct callsigns, including MTN8520, MTN7520, MTN8380, MTN7369, N760FX.