Apparatus

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sensors Mode-S transponder

A0F566

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N161AA · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
A0F566
Octal
50172546
Decimal
10,548,582
Country
US
Tail
N161AA
Type
A321
No current signal · last broadcast 1h ago
Flights observed
495
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A0F566.

Country allocation

The ICAO 24-bit address A0F566 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 20 distinct

Callsign Airline Flights Last seen
AAL870 American Airlines 6 2026-06-24
AAL2143 - 6 2026-07-04
AAL1754 American Airlines 6 2026-06-03
AAL3224 American Airlines 5 2026-04-27
AAL2747 - 5 2026-06-16
AAL2328 American Airlines 5 2026-04-30
AAL1886 - 5 2026-07-04
AAL3259 - 4 2026-07-12
AAL2988 - 4 2026-06-24
AAL2977 American Airlines 4 2026-06-08
AAL2562 American Airlines 4 2026-05-08
AAL2282 American Airlines 4 2026-06-11
AAL2216 - 4 2026-06-25
AAL1292 American Airlines 4 2026-05-07
AAL1276 American Airlines 4 2026-05-19
AAL996 - 3 2026-07-11
AAL863 - 3 2026-07-08
AAL702 American Airlines 3 2026-04-20
AAL60G American Airlines 3 2026-04-23
AAL437 - 3 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 AAL2056 - Jul 17, 22:05 UTCJul 18, 02:29 UTC4h 25m
2026-07-17 AAL1960 - Jul 17, 15:29 UTCJul 17, 20:04 UTC4h 35m
2026-07-17 AAL1960 SFO → CLT Jul 17, 15:29 UTCJul 17, 20:05 UTC4h 36m
2026-07-17 AAL1580 - Jul 17, 04:20 UTCJul 17, 08:49 UTC4h 30m
2026-07-17 AAL1919 - Jul 17, 00:45 UTCJul 17, 02:45 UTC2h 0m
2026-07-16 AAL1919 - Jul 16, 16:49 UTCJul 16, 18:50 UTC2h 0m
2026-07-16 AAL2830 - Jul 16, 00:00 UTCJul 16, 14:40 UTC14h 40m
2026-07-15 AAL2602 - Jul 15, 18:30 UTCJul 15, 22:10 UTC3h 40m
2026-07-15 AAL2602 - Jul 15, 13:45 UTCJul 15, 17:10 UTC3h 25m
2026-07-15 AAL1834 - Jul 15, 10:30 UTCJul 15, 11:20 UTC50m
2026-07-15 AAL1834 JAX → CLT Jul 15, 10:26 UTCJul 15, 11:21 UTC55m
2026-07-15 AAL2713 - Jul 15, 05:30 UTCJul 15, 06:20 UTC50m
2026-07-15 AAL2976 - Jul 15, 02:20 UTCJul 15, 03:45 UTC1h 25m
2026-07-15 AAL2976 ORD → CLT Jul 15, 02:16 UTCJul 15, 03:44 UTC1h 28m
2026-07-14 AAL2474 DFW → ORD Jul 14, 22:20 UTCJul 15, 00:20 UTC1h 59m
2026-07-14 AAL1120 - Jul 14, 18:45 UTCJul 14, 20:35 UTC1h 50m
2026-07-14 AAL2922 SEA → ORD Jul 14, 13:22 UTCJul 14, 17:03 UTC3h 41m
2026-07-14 AAL2922 SEA → ORD Jul 14, 13:25 UTCJul 14, 17:05 UTC3h 40m
2026-07-14 AAL1674 - Jul 14, 01:30 UTCJul 14, 06:05 UTC4h 35m
2026-07-13 AAL2379 - Jul 13, 23:05 UTCJul 13, 23:45 UTC40m
2026-07-13 AAL2379 - Jul 13, 21:25 UTCJul 13, 22:10 UTC45m
2026-07-13 AAL2279 - Jul 13, 18:10 UTCJul 13, 19:35 UTC1h 25m
2026-07-13 AAL2279 - Jul 13, 15:25 UTCJul 13, 16:45 UTC1h 20m
2026-07-13 AAL1462 BOS → CLT Jul 13, 11:08 UTCJul 13, 12:56 UTC1h 48m
2026-07-13 AAL1462 - Jul 13, 11:10 UTCJul 13, 12:55 UTC1h 45m
2026-07-12 AAL1422 - Jul 12, 22:00 UTCJul 12, 23:35 UTC1h 35m
2026-07-12 AAL1696 DFW → CLT Jul 12, 17:06 UTCJul 12, 19:06 UTC2h 0m
2026-07-12 AAL1696 - Jul 12, 17:10 UTCJul 12, 19:10 UTC2h 0m
2026-07-12 AAL2748 SEA → DFW Jul 12, 12:25 UTCJul 12, 15:45 UTC3h 20m
2026-07-12 AAL2748 SEA → DFW Jul 12, 12:21 UTCJul 12, 15:41 UTC3h 20m
2026-07-12 AAL3259 - Jul 12, 01:35 UTCJul 12, 06:40 UTC5h 5m
2026-07-12 AAL3259 PHL → SEA Jul 12, 01:32 UTCJul 12, 06:40 UTC5h 8m
2026-07-12 AAL3259 PHL → PHL Jul 12, 01:15 UTCJul 12, 01:30 UTC15m
2026-07-11 AAL996 - Jul 11, 19:20 UTCJul 11, 22:55 UTC3h 35m
2026-07-11 AAL996 - Jul 11, 18:35 UTCJul 11, 18:45 UTC10m
2026-07-11 AAL996 UVF → PHL Jul 11, 18:31 UTCJul 11, 22:55 UTC4h 24m
2026-07-11 AAL2639 - Jul 11, 12:55 UTCJul 11, 16:15 UTC3h 20m
2026-07-11 AAL437 LAS → PHL Jul 11, 06:43 UTCJul 11, 11:06 UTC4h 23m
2026-07-11 AAL437 LAS → PHL Jul 11, 06:45 UTCJul 11, 10:50 UTC4h 5m
2026-07-11 AAL884 DFW → LAS Jul 11, 00:35 UTCJul 11, 03:01 UTC2h 25m
2026-07-10 AAL2767 TPA → DFW Jul 10, 20:40 UTCJul 10, 23:00 UTC2h 20m
2026-07-10 AAL2767 TPA → DFW Jul 10, 20:39 UTCJul 10, 22:50 UTC2h 11m
2026-07-10 AAL2767 DFW → TPA Jul 10, 17:20 UTCJul 10, 19:30 UTC2h 10m
2026-07-10 AAL1908 LAS → DFW Jul 10, 13:05 UTCJul 10, 15:35 UTC2h 30m
2026-07-10 AAL3250 - Jul 10, 05:00 UTCJul 10, 09:45 UTC4h 45m
2026-07-10 AAL3250 PHL → PHL Jul 10, 04:45 UTCJul 10, 04:50 UTC5m
2026-07-10 AAL3250 PHL → PHL Jul 10, 02:55 UTCJul 10, 03:00 UTC5m
2026-07-10 AAL2065 MCO → PHL Jul 10, 00:35 UTCJul 10, 02:35 UTC2h 0m
2026-07-09 AAL2065 - Jul 9, 16:35 UTCJul 9, 18:40 UTC2h 5m
2026-07-09 AAL2065 PHL → PHL Jul 9, 16:25 UTCJul 9, 16:30 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 N161AA page for operator, model, and routing details .

Mode-S A0F566 frequently asked

What is Mode-S code A0F566?
A0F566 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N161AA.
Where is Mode-S A0F566 registered?
Mode-S code A0F566 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 A0F566 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0F566, octal 50172546, decimal 10,548,582.
What flights does A0F566 operate?
Mode-S A0F566 has broadcast 20 distinct callsigns, including AAL870, AAL2143, AAL1754, AAL3224, AAL2747.