Apparatus

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sensors Mode-S transponder

A4AABC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N40ER · CESSNA 172 Skyhawk · operated by FLYING ACES AERO FLEET INC

Hex
A4AABC
Octal
51125274
Decimal
10,791,612
Country
US
Tail
N40ER
Type
C172
No current signal · last broadcast 18h ago
Flights observed
333
Distinct callsigns
1
Country
US
Last broadcast
18h ago

Last known position

Most recent position reported by Mode-S A4AABC.

Country allocation

The ICAO 24-bit address A4AABC 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
N40ER - 333 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N40ER SAV → SAV Jul 13, 19:10 UTCJul 13, 20:05 UTC55m
2026-07-13 N40ER SAV → SAV Jul 13, 12:45 UTCJul 13, 13:40 UTC55m
2026-07-13 N40ER SAV → SAV Jul 13, 11:00 UTCJul 13, 11:45 UTC45m
2026-07-12 N40ER - Jul 12, 17:45 UTCJul 12, 18:10 UTC25m
2026-07-12 N40ER - Jul 12, 16:50 UTCJul 12, 17:10 UTC20m
2026-07-12 N40ER SAV → SAV Jul 12, 15:01 UTCJul 12, 15:55 UTC55m
2026-07-12 N40ER - Jul 12, 12:10 UTCJul 12, 13:25 UTC1h 15m
2026-07-12 N40ER - Jul 12, 10:35 UTCJul 12, 11:35 UTC1h 0m
2026-07-12 N40ER SAV → SAV Jul 12, 01:20 UTCJul 12, 02:30 UTC1h 10m
2026-07-11 N40ER SAV → SAV Jul 11, 23:30 UTCJul 12, 00:25 UTC55m
2026-07-11 N40ER SAV → SAV Jul 11, 20:40 UTCJul 11, 21:40 UTC1h 0m
2026-07-11 N40ER SAV → SAV Jul 11, 12:45 UTCJul 11, 13:30 UTC45m
2026-07-11 N40ER SAV → SAV Jul 11, 02:35 UTCJul 11, 03:45 UTC1h 10m
2026-07-10 N40ER - Jul 10, 22:25 UTCJul 10, 22:35 UTC10m
2026-07-10 N40ER - Jul 10, 21:10 UTCJul 10, 21:45 UTC35m
2026-07-10 N40ER SAV → SAV Jul 10, 17:25 UTCJul 10, 18:50 UTC1h 25m
2026-07-10 N40ER SAV → SAV Jul 10, 15:05 UTCJul 10, 16:25 UTC1h 20m
2026-07-10 N40ER SAV → SAV Jul 10, 12:55 UTCJul 10, 13:50 UTC55m
2026-07-09 N40ER - Jul 9, 17:00 UTCJul 9, 17:35 UTC35m
2026-07-09 N40ER - Jul 9, 15:00 UTCJul 9, 15:40 UTC40m
2026-07-08 N40ER - Jul 8, 18:50 UTCJul 8, 19:40 UTC50m
2026-07-08 N40ER SAV → SAV Jul 8, 14:45 UTCJul 8, 15:20 UTC35m
2026-07-08 N40ER - Jul 8, 10:40 UTCJul 8, 11:50 UTC1h 10m
2026-07-07 N40ER - Jul 7, 15:45 UTCJul 7, 16:35 UTC50m
2026-07-06 N40ER - Jul 6, 20:05 UTCJul 6, 21:00 UTC55m
2026-07-06 N40ER - Jul 6, 15:45 UTCJul 6, 16:00 UTC15m
2026-07-06 N40ER - Jul 6, 12:45 UTCJul 6, 13:45 UTC1h 0m
2026-07-05 N40ER - Jul 5, 14:30 UTCJul 5, 15:50 UTC1h 20m
2026-07-04 N40ER - Jul 4, 13:05 UTCJul 4, 14:35 UTC1h 30m
2026-07-03 N40ER - Jul 3, 20:45 UTCJul 3, 21:10 UTC25m
2026-07-03 N40ER - Jul 3, 16:40 UTCJul 3, 16:50 UTC10m
2026-07-03 N40ER - Jul 3, 14:55 UTCJul 3, 15:45 UTC50m
2026-07-03 N40ER - Jul 3, 01:35 UTCJul 3, 02:55 UTC1h 20m
2026-07-02 N40ER - Jul 2, 23:25 UTCJul 3, 00:35 UTC1h 10m
2026-07-02 N40ER - Jul 2, 21:55 UTCJul 2, 22:25 UTC30m
2026-07-02 N40ER - Jul 2, 18:20 UTCJul 2, 19:00 UTC40m
2026-07-02 N40ER - Jul 2, 12:30 UTCJul 2, 13:50 UTC1h 20m
2026-07-02 N40ER - Jul 2, 02:05 UTCJul 2, 02:55 UTC50m
2026-07-01 N40ER - Jul 1, 18:55 UTCJul 1, 20:05 UTC1h 10m
2026-07-01 N40ER - Jul 1, 16:55 UTCJul 1, 17:15 UTC20m
2026-07-01 N40ER - Jul 1, 12:55 UTCJul 1, 13:30 UTC35m
2026-06-30 N40ER - Jun 30, 21:40 UTCJun 30, 22:20 UTC40m
2026-06-30 N40ER - Jun 30, 19:15 UTCJun 30, 20:15 UTC1h 0m
2026-06-30 N40ER - Jun 30, 15:50 UTCJun 30, 16:00 UTC10m
2026-06-30 N40ER - Jun 30, 14:40 UTCJun 30, 15:00 UTC20m
2026-06-30 N40ER - Jun 30, 12:35 UTCJun 30, 13:45 UTC1h 10m
2026-06-29 N40ER - Jun 29, 15:00 UTCJun 29, 15:49 UTC50m
2026-06-29 N40ER - Jun 29, 13:44 UTCJun 29, 13:54 UTC10m
2026-06-29 N40ER - Jun 29, 12:55 UTCJun 29, 13:04 UTC10m
2026-06-29 N40ER - Jun 29, 11:10 UTCJun 29, 12:09 UTC1h 0m

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 N40ER page for operator, model, and routing details .

Mode-S A4AABC frequently asked

What is Mode-S code A4AABC?
A4AABC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N40ER.
Where is Mode-S A4AABC registered?
Mode-S code A4AABC 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 A4AABC broadcasting right now?
No active broadcast right now. Last signal was 18h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4AABC, octal 51125274, decimal 10,791,612.
What flights does A4AABC operate?
Mode-S A4AABC has broadcast 1 distinct callsign, including N40ER.