Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A101C3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N164NN · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
A101C3
Octal
50200703
Decimal
10,551,747
Country
US
Tail
N164NN
Type
A321
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
488
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S A101C3.

Country allocation

The ICAO 24-bit address A101C3 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
AAL420 - 8 2026-07-15
AAL2852 American Airlines 8 2026-05-17
AAL2310 - 7 2026-07-10
AAL777 American Airlines 6 2026-07-02
AAL661 American Airlines 6 2026-04-18
AAL2676 American Airlines 6 2026-06-11
AAL2634 - 6 2026-07-09
AAL1738 American Airlines 6 2026-04-18
AAL1448 - 6 2026-07-04
AAL2519 - 5 2026-04-13
AAL844 American Airlines 4 2026-06-05
AAL2777 - 4 2026-06-26
AAL2320 American Airlines 4 2026-05-18
AAL1768 - 4 2026-06-28
AAL1563 American Airlines 4 2026-04-30
AAL1139 American Airlines 4 2026-04-21
AAL1120 American Airlines 4 2026-06-04
AAL605 American Airlines 3 2026-05-02
AAL3057 American Airlines 3 2026-04-15
AAL2976 American Airlines 3 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2379 DFW → SFO Jul 26, 21:00 UTCJul 26, 21:35 UTC35m
2026-07-26 AAL1696 BOS → DFW Jul 26, 17:18 UTCJul 26, 19:24 UTC2h 6m
2026-07-26 AAL1696 BOS → DFW Jul 26, 17:20 UTCJul 26, 19:25 UTC2h 5m
2026-07-26 AAL1692 MIA → EWR Jul 26, 12:45 UTCJul 26, 15:35 UTC2h 50m
2026-07-26 AAL2285 SNA → ORD Jul 26, 06:00 UTCJul 26, 10:25 UTC4h 26m
2026-07-26 AAL2285 SNA → ORD Jul 26, 05:59 UTCJul 26, 10:23 UTC4h 24m
2026-07-26 AAL2298 BOS → MIA Jul 26, 01:20 UTCJul 26, 04:50 UTC3h 30m
2026-07-25 AAL2870 PHL → STL Jul 25, 21:30 UTCJul 25, 23:35 UTC2h 5m
2026-07-25 AAL2870 PHL → STL Jul 25, 17:55 UTCJul 25, 20:05 UTC2h 10m
2026-07-25 AAL2535 SAN → DFW Jul 25, 13:50 UTCJul 25, 16:20 UTC2h 30m
2026-07-25 AAL3195 DEN → PHX Jul 25, 00:00 UTCJul 25, 02:20 UTC2h 20m
2026-07-24 AAL3195 DEN → PHX Jul 24, 23:55 UTCJul 25, 02:19 UTC2h 24m
2026-07-23 AAL41R CLT → MSP Jul 23, 02:40 UTCJul 23, 05:25 UTC2h 45m
2026-07-18 AAL2160 - Jul 18, 22:20 UTCJul 19, 02:55 UTC4h 35m
2026-07-18 AAL2801 LAX → CUN Jul 18, 16:29 UTCJul 18, 20:54 UTC4h 25m
2026-07-18 AAL2801 - Jul 18, 16:30 UTCJul 18, 20:45 UTC4h 15m
2026-07-17 AAL1972 DFW → LAX Jul 17, 23:03 UTCJul 18, 01:35 UTC2h 32m
2026-07-17 AAL1972 - Jul 17, 23:05 UTCJul 18, 01:39 UTC2h 35m
2026-07-17 AAL2633 SMF → DFW Jul 17, 18:20 UTCJul 17, 21:24 UTC3h 4m
2026-07-17 AAL2633 SMF → DFW Jul 17, 18:19 UTCJul 17, 21:25 UTC3h 5m
2026-07-17 AAL2633 - Jul 17, 14:00 UTCJul 17, 16:59 UTC3h 0m
2026-07-15 AAL420 - Jul 15, 21:25 UTCJul 15, 22:45 UTC1h 20m
2026-07-15 AAL420 DEN → DFW Jul 15, 21:22 UTCJul 15, 22:55 UTC1h 33m
2026-07-15 AAL420 - Jul 15, 18:45 UTCJul 15, 20:15 UTC1h 30m
2026-07-15 AAL1021 SMF → DFW Jul 15, 13:50 UTCJul 15, 16:50 UTC3h 0m
2026-07-15 AAL509 DFW → SMF Jul 15, 03:55 UTCJul 15, 06:50 UTC2h 55m
2026-07-14 AAL503 DFW → DFW Jul 14, 15:45 UTCJul 15, 01:35 UTC9h 49m
2026-07-14 AAL1655 - Jul 14, 12:20 UTCJul 14, 14:15 UTC1h 55m
2026-07-14 AAL1648 - Jul 14, 04:05 UTCJul 14, 04:35 UTC30m
2026-07-13 AAL1648 - Jul 13, 23:45 UTCJul 14, 02:45 UTC3h 0m
2026-07-13 AAL1648 PHX → DFW Jul 13, 19:30 UTCJul 13, 21:35 UTC2h 5m
2026-07-13 AAL2990 DFW → PHX Jul 13, 16:10 UTCJul 13, 18:05 UTC1h 55m
2026-07-13 AAL1902 - Jul 13, 12:35 UTCJul 13, 14:35 UTC2h 0m
2026-07-13 AAL1902 ORD → DFW Jul 13, 12:32 UTCJul 13, 14:30 UTC1h 58m
2026-07-13 AAL2977 - Jul 13, 07:30 UTCJul 13, 10:55 UTC3h 25m
2026-07-13 AAL2977 ORD → PDX Jul 13, 02:45 UTCJul 13, 06:20 UTC3h 35m
2026-07-12 AAL619 - Jul 12, 13:20 UTCJul 12, 23:30 UTC10h 10m
2026-07-12 AAL1148 PHX → ORD Jul 12, 08:10 UTCJul 12, 11:15 UTC3h 5m
2026-07-12 AAL1148 PHX → ORD Jul 12, 08:10 UTCJul 12, 11:08 UTC2h 58m
2026-07-12 AAL2786 ORD → PHX Jul 12, 03:55 UTCJul 12, 06:50 UTC2h 55m
2026-07-11 AAL2786 PHX → ORD Jul 11, 23:30 UTCJul 12, 02:30 UTC3h 0m
2026-07-11 AAL2902 - Jul 11, 18:20 UTCJul 11, 22:10 UTC3h 50m
2026-07-11 AAL2902 CLT → PHX Jul 11, 18:17 UTCJul 11, 22:05 UTC3h 48m
2026-07-11 AAL3082 - Jul 11, 12:15 UTCJul 11, 16:50 UTC4h 35m
2026-07-11 AAL3054 ORD → SFO Jul 11, 02:55 UTCJul 11, 06:55 UTC4h 0m
2026-07-10 AAL2488 - Jul 10, 23:25 UTCJul 11, 00:55 UTC1h 30m
2026-07-10 AAL2488 CLT → ORD Jul 10, 23:22 UTCJul 11, 00:54 UTC1h 32m
2026-07-10 AAL2832 - Jul 10, 20:20 UTCJul 10, 21:30 UTC1h 11m
2026-07-10 AAL2832 TPA → CLT Jul 10, 20:20 UTCJul 10, 21:31 UTC1h 11m
2026-07-10 AAL2832 - Jul 10, 17:05 UTCJul 10, 18:15 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 N164NN page for operator, model, and routing details .

Mode-S A101C3 frequently asked

What is Mode-S code A101C3?
A101C3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N164NN.
Where is Mode-S A101C3 registered?
Mode-S code A101C3 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 A101C3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A101C3, octal 50200703, decimal 10,551,747.
What flights does A101C3 operate?
Mode-S A101C3 has broadcast 20 distinct callsigns, including AAL420, AAL2852, AAL2310, AAL777, AAL661.