Apparatus

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sensors Mode-S transponder

A72AB4

ICAO 24-bit transponder address · allocated to United States

Hex
A72AB4
Octal
51625264
Decimal
10,955,444
Country
US
No current signal · last broadcast 8h ago
Flights observed
120
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A72AB4.

Country allocation

The ICAO 24-bit address A72AB4 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 1 distinct

Callsign Airline Flights Last seen
N561AU - 120 2026-06-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-03 N561AU HII → VGT Jun 3, 01:45 UTCJun 3, 02:30 UTC45m
2026-06-02 N561AU VGT → HII Jun 2, 23:50 UTCJun 3, 01:00 UTC1h 10m
2026-06-02 N561AU - Jun 2, 16:15 UTCJun 2, 16:35 UTC20m
2026-06-02 N561AU VGT → VGT Jun 2, 15:45 UTCJun 2, 16:10 UTC25m
2026-06-01 N561AU VGT → VGT Jun 1, 20:50 UTCJun 1, 22:00 UTC1h 10m
2026-05-31 N561AU - May 31, 23:15 UTCJun 1, 00:00 UTC45m
2026-05-31 N561AU - May 31, 21:50 UTCMay 31, 22:20 UTC30m
2026-05-31 N561AU VGT → VGT May 31, 17:55 UTCMay 31, 18:35 UTC40m
2026-05-31 N561AU - May 31, 15:50 UTCMay 31, 16:15 UTC25m
2026-05-31 N561AU - May 31, 13:35 UTCMay 31, 14:30 UTC55m
2026-05-31 N561AU - May 31, 00:55 UTCMay 31, 01:11 UTC16m
2026-05-30 N561AU - May 30, 14:50 UTCMay 30, 15:35 UTC45m
2026-05-30 N561AU - May 30, 13:40 UTCMay 30, 14:20 UTC40m
2026-05-29 N561AU VGT → VGT May 29, 20:25 UTCMay 29, 21:15 UTC50m
2026-05-29 N561AU VGT → VGT May 29, 16:00 UTCMay 29, 16:05 UTC5m
2026-05-29 N561AU VGT → VGT May 29, 14:45 UTCMay 29, 15:50 UTC1h 5m
2026-05-28 N561AU VGT → VGT May 28, 16:30 UTCMay 28, 17:35 UTC1h 5m
2026-05-28 N561AU VGT → VGT May 28, 12:55 UTCMay 28, 14:35 UTC1h 40m
2026-05-27 N561AU - May 27, 17:25 UTCMay 27, 17:50 UTC25m
2026-05-27 N561AU - May 27, 16:10 UTCMay 27, 16:30 UTC20m
2026-05-26 N561AU - May 26, 01:14 UTCMay 26, 01:34 UTC20m
2026-05-26 N561AU - May 26, 00:09 UTCMay 26, 00:35 UTC25m
2026-05-24 N561AU - May 24, 20:45 UTCMay 24, 21:10 UTC25m
2026-05-24 N561AU - May 24, 19:30 UTCMay 24, 20:10 UTC40m
2026-05-23 N561AU - May 23, 18:15 UTCMay 23, 18:40 UTC25m
2026-05-23 N561AU - May 23, 16:55 UTCMay 23, 17:20 UTC25m
2026-05-23 N561AU GYR → VGT May 23, 00:50 UTCMay 23, 02:25 UTC1h 35m
2026-05-22 N561AU VGT → GYR May 22, 21:50 UTCMay 22, 23:20 UTC1h 30m
2026-05-21 N561AU VGT → VGT May 21, 20:55 UTCMay 21, 21:35 UTC40m
2026-05-20 N561AU VGT → VGT May 20, 15:55 UTCMay 20, 17:25 UTC1h 30m
2026-05-13 N561AU - May 13, 17:20 UTCMay 13, 17:40 UTC20m
2026-05-13 N561AU - May 13, 16:15 UTCMay 13, 16:45 UTC30m
2026-05-13 N561AU - May 13, 00:00 UTCMay 13, 00:40 UTC40m
2026-05-12 N561AU - May 12, 22:35 UTCMay 12, 23:05 UTC30m
2026-05-12 N561AU VGT → VGT May 12, 19:25 UTCMay 12, 20:40 UTC1h 15m
2026-05-12 N561AU - May 12, 15:10 UTCMay 12, 15:35 UTC25m
2026-05-12 N561AU - May 12, 14:15 UTCMay 12, 14:35 UTC20m
2026-05-11 N561AU VGT → VGT May 11, 17:25 UTCMay 11, 19:20 UTC1h 55m
2026-05-10 N561AU - May 10, 22:20 UTCMay 10, 23:09 UTC50m
2026-05-10 N561AU - May 10, 20:35 UTCMay 10, 21:19 UTC45m
2026-05-10 N561AU VGT → VGT May 10, 17:20 UTCMay 10, 19:00 UTC1h 40m
2026-05-10 N561AU VGT → VGT May 10, 16:50 UTCMay 10, 16:55 UTC5m
2026-05-10 N561AU VGT → VGT May 10, 01:14 UTCMay 10, 01:20 UTC5m
2026-05-10 N561AU - May 10, 00:49 UTCMay 10, 01:00 UTC10m
2026-05-10 N561AU VGT → VGT May 10, 00:24 UTCMay 10, 00:30 UTC5m
2026-05-10 N561AU VGT → VGT May 10, 00:05 UTCMay 10, 00:09 UTC5m
2026-05-09 N561AU VGT → VGT May 9, 23:44 UTCMay 10, 00:00 UTC15m
2026-05-09 N561AU - May 9, 20:10 UTCMay 9, 22:10 UTC2h 0m
2026-05-09 N561AU VGT → VGT May 9, 17:25 UTCMay 9, 19:10 UTC1h 45m
2026-05-09 N561AU - May 9, 04:40 UTCMay 9, 04:45 UTC5m

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.

Mode-S A72AB4 frequently asked

What is Mode-S code A72AB4?
A72AB4 is an ICAO 24-bit transponder address. Allocated to United States.
Where is Mode-S A72AB4 registered?
Mode-S code A72AB4 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 A72AB4 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A72AB4, octal 51625264, decimal 10,955,444.
What flights does A72AB4 operate?
Mode-S A72AB4 has broadcast 1 distinct callsign, including N561AU.