Apparatus

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sensors Mode-S transponder

A4EAAA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N416CP · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
A4EAAA
Octal
51165252
Decimal
10,807,978
Country
US
Tail
N416CP
Type
C172
No current signal · last broadcast 3d ago
Flights observed
101
Distinct callsigns
1
Country
US
Last broadcast
3d ago

Last known position

Most recent position reported by Mode-S A4EAAA.

Country allocation

The ICAO 24-bit address A4EAAA 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
AUB127 - 101 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 AUB127 AUO → AUO Jul 11, 00:40 UTCJul 11, 00:45 UTC5m
2026-07-10 AUB127 AUO → AUO Jul 10, 23:00 UTCJul 11, 00:35 UTC1h 35m
2026-07-10 AUB127 AUO → AUO Jul 10, 17:30 UTCJul 10, 18:20 UTC50m
2026-07-09 AUB127 - Jul 9, 16:50 UTCJul 9, 17:00 UTC10m
2026-07-09 AUB127 - Jul 9, 15:50 UTCJul 9, 16:05 UTC15m
2026-07-08 AUB127 AUO → AUO Jul 8, 17:25 UTCJul 8, 19:05 UTC1h 40m
2026-07-07 AUB127 AUO → AUO Jul 7, 20:25 UTCJul 7, 21:45 UTC1h 20m
2026-07-07 AUB127 AUO → AUO Jul 7, 02:10 UTCJul 7, 03:15 UTC1h 5m
2026-07-03 AUB127 AUO → AUO Jul 3, 16:15 UTCJul 3, 17:20 UTC1h 5m
2026-07-02 AUB127 AUO → AUO Jul 2, 19:10 UTCJul 2, 20:25 UTC1h 15m
2026-07-02 AUB127 AUO → AUO Jul 2, 12:10 UTCJul 2, 13:30 UTC1h 20m
2026-07-01 AUB127 AUO → AUO Jul 1, 17:35 UTCJul 1, 18:25 UTC50m
2026-07-01 AUB127 - Jul 1, 14:15 UTCJul 1, 14:25 UTC10m
2026-07-01 AUB127 - Jul 1, 12:30 UTCJul 1, 13:35 UTC1h 5m
2026-06-30 AUB127 AUO → AUO Jun 30, 21:40 UTCJun 30, 22:35 UTC55m
2026-06-30 AUB127 AUO → AUO Jun 30, 14:35 UTCJun 30, 15:40 UTC1h 5m
2026-06-30 AUB127 AUO → AUO Jun 30, 01:55 UTCJun 30, 03:05 UTC1h 10m
2026-06-29 AUB127 AUO → AUO Jun 29, 20:04 UTCJun 29, 20:59 UTC55m
2026-06-29 AUB127 AUO → AUO Jun 29, 14:25 UTCJun 29, 15:19 UTC55m
2026-06-26 AUB127 AUO → AUO Jun 26, 22:10 UTCJun 26, 23:15 UTC1h 5m
2026-06-26 AUB127 AUO → AUO Jun 26, 14:15 UTCJun 26, 15:39 UTC1h 25m
2026-06-25 AUB127 - Jun 25, 20:49 UTCJun 25, 21:10 UTC20m
2026-06-25 AUB127 - Jun 25, 19:09 UTCJun 25, 19:24 UTC15m
2026-06-25 AUB127 AUO → AUO Jun 25, 13:45 UTCJun 25, 14:50 UTC1h 5m
2026-06-25 AUB127 AUO → AUO Jun 25, 01:44 UTCJun 25, 02:54 UTC1h 10m
2026-06-24 AUB127 AUO → AUO Jun 24, 18:29 UTCJun 24, 21:00 UTC2h 30m
2026-06-24 AUB127 AUO → AUO Jun 24, 16:05 UTCJun 24, 16:59 UTC55m
2026-06-24 AUB127 - Jun 24, 00:34 UTCJun 24, 00:55 UTC20m
2026-06-23 AUB127 - Jun 23, 23:29 UTCJun 23, 23:44 UTC15m
2026-06-23 AUB127 AUO → AUO Jun 23, 19:10 UTCJun 23, 20:29 UTC1h 20m
2026-06-23 AUB127 AUO → AUO Jun 23, 15:44 UTCJun 23, 16:50 UTC1h 5m
2026-06-23 AUB127 AUO → AUO Jun 23, 01:20 UTCJun 23, 02:40 UTC1h 20m
2026-06-22 AUB127 - Jun 22, 16:45 UTCJun 22, 17:10 UTC25m
2026-06-22 AUB127 - Jun 22, 15:40 UTCJun 22, 16:05 UTC25m
2026-06-19 AUB127 AUO → AUO Jun 19, 20:49 UTCJun 19, 22:09 UTC1h 20m
2026-06-17 AUB127 AUO → AUO Jun 17, 15:30 UTCJun 17, 17:55 UTC2h 25m
2026-06-16 AUB127 AUO → AUO Jun 16, 12:05 UTCJun 16, 13:19 UTC1h 15m
2026-06-15 AUB127 AUO → AUO Jun 15, 15:45 UTCJun 15, 17:10 UTC1h 25m
2026-06-12 AUB127 - Jun 12, 23:00 UTCJun 12, 23:25 UTC25m
2026-06-12 AUB127 - Jun 12, 22:10 UTCJun 12, 22:25 UTC15m
2026-06-12 AUB127 - Jun 12, 16:25 UTCJun 12, 16:45 UTC20m
2026-06-12 AUB127 - Jun 12, 15:25 UTCJun 12, 15:45 UTC20m
2026-06-12 AUB127 - Jun 12, 02:55 UTCJun 12, 03:15 UTC20m
2026-06-12 AUB127 - Jun 12, 01:35 UTCJun 12, 01:55 UTC20m
2026-06-11 AUB127 AUO → AUO Jun 11, 16:55 UTCJun 11, 17:00 UTC5m
2026-06-11 AUB127 - Jun 11, 15:40 UTCJun 11, 16:15 UTC35m
2026-06-11 AUB127 AUO → AUO Jun 11, 03:25 UTCJun 11, 03:30 UTC5m
2026-06-11 AUB127 AUO → AUO Jun 11, 01:50 UTCJun 11, 03:15 UTC1h 25m
2026-06-10 AUB127 - Jun 10, 21:25 UTCJun 10, 21:35 UTC10m
2026-06-10 AUB127 - Jun 10, 20:00 UTCJun 10, 20:05 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.

Prefer a tail-number view? See the N416CP page for operator, model, and routing details .

Mode-S A4EAAA frequently asked

What is Mode-S code A4EAAA?
A4EAAA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N416CP.
Where is Mode-S A4EAAA registered?
Mode-S code A4EAAA 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 A4EAAA 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 A4EAAA, octal 51165252, decimal 10,807,978.
What flights does A4EAAA operate?
Mode-S A4EAAA has broadcast 1 distinct callsign, including AUB127.