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sensors Mode-S transponder

A4AAAD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N40EA · CESSNA 208 Caravan

Hex
A4AAAD
Octal
51125255
Decimal
10,791,597
Country
US
Tail
N40EA
Type
C208
No current signal · last broadcast Jul 23, 23:30 UTC
Flights observed
124
Distinct callsigns
1
Country
US
Last broadcast
Jul 23, 23:30 UTC

Last known position

Most recent position reported by Mode-S A4AAAD.

Country allocation

The ICAO 24-bit address A4AAAD 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
N40EA - 124 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 N40EA - Jul 23, 20:30 UTCJul 23, 23:30 UTC3h 0m
2026-07-23 N40EA - Jul 23, 16:40 UTCJul 23, 19:55 UTC3h 15m
2026-07-22 N40EA - Jul 22, 22:15 UTCJul 23, 00:20 UTC2h 5m
2026-07-22 N40EA - Jul 22, 16:50 UTCJul 22, 21:45 UTC4h 55m
2026-07-21 N40EA - Jul 21, 22:10 UTCJul 22, 00:10 UTC2h 0m
2026-07-21 N40EA - Jul 21, 20:05 UTCJul 21, 21:40 UTC1h 35m
2026-07-21 N40EA - Jul 21, 18:35 UTCJul 21, 19:20 UTC45m
2026-07-21 N40EA - Jul 21, 16:40 UTCJul 21, 18:05 UTC1h 25m
2026-07-20 N40EA - Jul 20, 22:30 UTCJul 20, 22:45 UTC15m
2026-07-20 N40EA - Jul 20, 20:00 UTCJul 20, 21:50 UTC1h 50m
2026-07-20 N40EA - Jul 20, 16:40 UTCJul 20, 17:20 UTC40m
2026-07-19 N40EA - Jul 19, 21:45 UTCJul 19, 23:10 UTC1h 25m
2026-07-19 N40EA - Jul 19, 19:55 UTCJul 19, 20:20 UTC25m
2026-07-19 N40EA - Jul 19, 17:55 UTCJul 19, 18:40 UTC45m
2026-07-19 N40EA - Jul 19, 15:55 UTCJul 19, 17:05 UTC1h 10m
2026-07-18 N40EA - Jul 18, 20:40 UTCJul 18, 21:30 UTC50m
2026-07-18 N40EA - Jul 18, 19:00 UTCJul 18, 19:55 UTC55m
2026-07-18 N40EA - Jul 18, 16:15 UTCJul 18, 18:15 UTC2h 0m
2026-07-18 N40EA - Jul 18, 14:00 UTCJul 18, 14:40 UTC40m
2026-07-17 N40EA - Jul 17, 22:45 UTCJul 17, 23:00 UTC15m
2026-07-17 N40EA - Jul 17, 19:55 UTCJul 17, 22:10 UTC2h 15m
2026-07-17 N40EA - Jul 17, 17:35 UTCJul 17, 18:44 UTC1h 10m
2026-07-17 N40EA - Jul 17, 15:00 UTCJul 17, 16:55 UTC1h 55m
2026-07-16 N40EA - Jul 16, 21:55 UTCJul 17, 00:45 UTC2h 50m
2026-07-16 N40EA - Jul 16, 00:50 UTCJul 16, 01:10 UTC20m
2026-07-15 N40EA - Jul 15, 18:25 UTCJul 16, 00:20 UTC5h 55m
2026-07-14 N40EA - Jul 14, 16:30 UTCJul 15, 01:00 UTC8h 29m
2026-07-13 N40EA - Jul 13, 23:30 UTCJul 13, 23:45 UTC15m
2026-07-13 N40EA - Jul 13, 16:25 UTCJul 13, 22:55 UTC6h 30m
2026-07-12 N40EA - Jul 12, 20:25 UTCJul 12, 21:30 UTC1h 5m
2026-07-12 N40EA - Jul 12, 15:50 UTCJul 12, 19:40 UTC3h 50m
2026-07-12 N40EA - Jul 12, 00:05 UTCJul 12, 00:25 UTC20m
2026-07-11 N40EA - Jul 11, 16:05 UTCJul 11, 23:05 UTC7h 0m
2026-07-11 N40EA - Jul 11, 14:15 UTCJul 11, 15:20 UTC1h 5m
2026-07-08 N40EA - Jul 8, 21:05 UTCJul 9, 00:00 UTC2h 55m
2026-07-08 N40EA - Jul 8, 16:20 UTCJul 8, 17:20 UTC1h 0m
2026-07-07 N40EA - Jul 7, 18:55 UTCJul 8, 00:10 UTC5h 15m
2026-07-07 N40EA - Jul 7, 17:40 UTCJul 7, 17:50 UTC10m
2026-07-07 N40EA - Jul 7, 14:35 UTCJul 7, 14:50 UTC15m
2026-07-06 N40EA - Jul 6, 16:35 UTCJul 6, 17:15 UTC40m
2026-07-06 N40EA - Jul 6, 00:50 UTCJul 6, 01:50 UTC1h 0m
2026-07-05 N40EA - Jul 5, 17:45 UTCJul 6, 00:15 UTC6h 30m
2026-07-05 N40EA - Jul 5, 14:10 UTCJul 5, 17:10 UTC3h 0m
2026-07-03 N40EA - Jul 3, 20:50 UTCJul 3, 22:50 UTC2h 0m
2026-07-03 N40EA - Jul 3, 15:45 UTCJul 3, 18:05 UTC2h 20m
2026-07-03 N40EA - Jul 3, 13:55 UTCJul 3, 14:45 UTC50m
2026-07-01 N40EA - Jul 1, 18:30 UTCJul 2, 00:05 UTC5h 35m
2026-07-01 N40EA - Jul 1, 16:50 UTCJul 1, 17:55 UTC1h 5m
2026-06-30 N40EA - Jun 30, 16:35 UTCJun 30, 22:40 UTC6h 5m
2026-06-29 N40EA - Jun 29, 20:09 UTCJun 29, 21:19 UTC1h 10m

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 N40EA page for operator, model, and routing details .

Mode-S A4AAAD frequently asked

What is Mode-S code A4AAAD?
A4AAAD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N40EA.
Where is Mode-S A4AAAD registered?
Mode-S code A4AAAD 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 A4AAAD broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 23:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4AAAD, octal 51125255, decimal 10,791,597.
What flights does A4AAAD operate?
Mode-S A4AAAD has broadcast 1 distinct callsign, including N40EA.