Apparatus

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sensors Mode-S transponder

A01AA4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N1057R · CESSNA 172 Skyhawk · operated by ANESTHESIA AVIATION LLC

Hex
A01AA4
Octal
50015244
Decimal
10,492,580
Country
US
Tail
N1057R
Type
C172
No current signal · last broadcast 8h ago
Flights observed
111
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A01AA4.

Country allocation

The ICAO 24-bit address A01AA4 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
AVL220 - 111 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 AVL220 - Jul 23, 22:25 UTCJul 23, 23:25 UTC1h 0m
2026-07-23 AVL220 - Jul 23, 19:10 UTCJul 23, 20:00 UTC50m
2026-07-23 AVL220 - Jul 23, 16:55 UTCJul 23, 18:40 UTC1h 45m
2026-07-23 AVL220 - Jul 23, 15:40 UTCJul 23, 16:00 UTC20m
2026-07-10 AVL220 - Jul 10, 20:00 UTCJul 10, 20:25 UTC25m
2026-07-10 AVL220 - Jul 10, 16:40 UTCJul 10, 17:00 UTC20m
2026-07-10 AVL220 - Jul 10, 14:40 UTCJul 10, 15:35 UTC55m
2026-07-05 AVL220 - Jul 5, 15:00 UTCJul 5, 15:45 UTC45m
2026-07-05 AVL220 - Jul 5, 12:45 UTCJul 5, 13:35 UTC50m
2026-07-04 AVL220 - Jul 4, 17:15 UTCJul 4, 18:35 UTC1h 20m
2026-07-03 AVL220 - Jul 3, 14:10 UTCJul 3, 14:55 UTC45m
2026-07-03 AVL220 - Jul 3, 12:25 UTCJul 3, 13:10 UTC45m
2026-07-02 AVL220 - Jul 2, 19:50 UTCJul 2, 21:25 UTC1h 35m
2026-07-02 AVL220 - Jul 2, 18:00 UTCJul 2, 18:25 UTC25m
2026-07-02 AVL220 - Jul 2, 14:20 UTCJul 2, 15:35 UTC1h 15m
2026-07-02 AVL220 - Jul 2, 11:50 UTCJul 2, 12:45 UTC55m
2026-07-01 AVL220 - Jul 1, 21:05 UTCJul 1, 21:45 UTC40m
2026-07-01 AVL220 - Jul 1, 18:35 UTCJul 1, 19:40 UTC1h 5m
2026-07-01 AVL220 - Jul 1, 16:55 UTCJul 1, 17:50 UTC55m
2026-06-30 AVL220 - Jun 30, 20:20 UTCJun 30, 21:45 UTC1h 25m
2026-06-30 AVL220 - Jun 30, 16:25 UTCJun 30, 17:35 UTC1h 10m
2026-06-30 AVL220 - Jun 30, 14:05 UTCJun 30, 15:20 UTC1h 15m
2026-06-29 AVL220 - Jun 29, 23:05 UTCJun 30, 00:35 UTC1h 30m
2026-06-29 AVL220 - Jun 29, 19:39 UTCJun 29, 20:59 UTC1h 20m
2026-06-27 AVL220 - Jun 27, 01:35 UTCJun 27, 02:45 UTC1h 10m
2026-06-27 AVL220 - Jun 27, 00:14 UTCJun 27, 00:44 UTC30m
2026-06-26 AVL220 - Jun 26, 17:19 UTCJun 26, 17:54 UTC35m
2026-06-26 AVL220 - Jun 26, 14:35 UTCJun 26, 14:50 UTC15m
2026-06-25 AVL220 - Jun 25, 16:55 UTCJun 25, 18:10 UTC1h 15m
2026-06-24 AVL220 - Jun 24, 21:09 UTCJun 24, 23:00 UTC1h 50m
2026-06-24 AVL220 - Jun 24, 16:45 UTCJun 24, 18:15 UTC1h 30m
2026-06-24 AVL220 - Jun 24, 14:24 UTCJun 24, 15:49 UTC1h 25m
2026-06-24 AVL220 - Jun 24, 12:04 UTCJun 24, 13:24 UTC1h 20m
2026-06-22 AVL220 - Jun 22, 16:54 UTCJun 22, 18:09 UTC1h 15m
2026-06-22 AVL220 - Jun 22, 01:19 UTCJun 22, 04:00 UTC2h 40m
2026-06-21 AVL220 - Jun 21, 17:54 UTCJun 21, 19:20 UTC1h 25m
2026-06-21 AVL220 - Jun 21, 15:25 UTCJun 21, 15:49 UTC25m
2026-06-21 AVL220 - Jun 21, 12:35 UTCJun 21, 13:09 UTC35m
2026-06-19 AVL220 - Jun 19, 21:14 UTCJun 19, 22:55 UTC1h 40m
2026-06-19 AVL220 - Jun 19, 19:39 UTCJun 19, 20:09 UTC30m
2026-06-19 AVL220 - Jun 19, 14:44 UTCJun 19, 16:09 UTC1h 25m
2026-06-19 AVL220 - Jun 19, 12:19 UTCJun 19, 13:44 UTC1h 25m
2026-06-17 AVL220 - Jun 17, 20:15 UTCJun 17, 20:50 UTC35m
2026-06-17 AVL220 - Jun 17, 15:05 UTCJun 17, 16:20 UTC1h 15m
2026-06-17 AVL220 - Jun 17, 13:10 UTCJun 17, 13:55 UTC45m
2026-06-16 AVL220 - Jun 16, 21:35 UTCJun 16, 22:50 UTC1h 15m
2026-06-16 AVL220 - Jun 16, 19:05 UTCJun 16, 20:05 UTC1h 1m
2026-06-16 AVL220 - Jun 16, 15:05 UTCJun 16, 17:30 UTC2h 25m
2026-06-15 AVL220 - Jun 15, 20:04 UTCJun 15, 21:35 UTC1h 30m
2026-06-14 AVL220 - Jun 14, 18:20 UTCJun 14, 19:45 UTC1h 25m

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 N1057R page for operator, model, and routing details .

Mode-S A01AA4 frequently asked

What is Mode-S code A01AA4?
A01AA4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N1057R.
Where is Mode-S A01AA4 registered?
Mode-S code A01AA4 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 A01AA4 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 A01AA4, octal 50015244, decimal 10,492,580.
What flights does A01AA4 operate?
Mode-S A01AA4 has broadcast 1 distinct callsign, including AVL220.