Apparatus

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sensors Mode-S transponder

A01C37

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N106NN · AIRBUS A-321 · operated by UMB BANK NA TRUSTEE

Hex
A01C37
Octal
50016067
Decimal
10,492,983
Country
US
Tail
N106NN
Type
A321
Broadcasting now · callsign AAL149 · 36,000 ft
Flights observed
137
Distinct callsigns
20
Country
US
Last broadcast
57m ago

Current position

A01C37 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A01C37 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
AAL171 - 9 2026-06-27
AAL3 - 8 2026-06-29
AAL238 American Airlines 8 2026-06-02
AAL149 American Airlines 8 2026-06-30
AAL276 - 7 2026-06-29
AAL15 - 7 2026-06-28
AAL4 American Airlines 6 2026-06-29
AAL28 - 6 2026-06-24
AAL234 - 6 2026-06-28
AAL179 - 6 2026-06-26
AAL177 - 6 2026-06-28
AAL166 - 6 2026-06-26
AAL148 - 6 2026-06-24
AAL117 - 5 2026-06-23
AAL2683 - 4 2026-06-16
AAL2 - 4 2026-06-14
AAL1578 - 4 2026-06-23
AAL12 - 4 2026-06-23
AAL1 American Airlines 4 2026-06-01
AAL307 American Airlines 3 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-30 AAL149 DEN → PHL Jun 30, 18:20 UTCJun 30, 21:45 UTC3h 25m
2026-06-29 AAL4 LAX → JFK Jun 29, 22:35 UTCJun 30, 03:30 UTC4h 56m
2026-06-29 AAL3 - Jun 29, 15:19 UTCJun 29, 20:40 UTC5h 20m
2026-06-29 AAL3 JFK → LAX Jun 29, 15:15 UTCJun 29, 20:40 UTC5h 25m
2026-06-29 AAL276 SFO → JFK Jun 29, 05:00 UTCJun 29, 09:44 UTC4h 45m
2026-06-28 AAL15 - Jun 28, 20:39 UTCJun 29, 02:35 UTC5h 55m
2026-06-28 AAL234 - Jun 28, 13:25 UTCJun 28, 18:29 UTC5h 5m
2026-06-28 AAL177 JFK → SFO Jun 28, 02:34 UTCJun 28, 08:09 UTC5h 35m
2026-06-28 AAL177 JFK → SFO Jun 28, 02:30 UTCJun 28, 08:15 UTC5h 45m
2026-06-27 AAL307 LAX → JFK Jun 27, 18:15 UTCJun 27, 23:10 UTC4h 55m
2026-06-27 AAL171 - Jun 27, 10:14 UTCJun 27, 15:45 UTC5h 30m
2026-06-26 AAL166 - Jun 26, 19:24 UTCJun 27, 00:29 UTC5h 5m
2026-06-26 AAL166 SFO → JFK Jun 26, 19:23 UTCJun 27, 00:20 UTC4h 57m
2026-06-26 AAL179 JFK → SFO Jun 26, 11:49 UTCJun 26, 17:35 UTC5h 45m
2026-06-25 AAL4 LAX → JFK Jun 25, 22:24 UTCJun 26, 03:05 UTC4h 40m
2026-06-25 AAL3 - Jun 25, 15:10 UTCJun 25, 20:59 UTC5h 50m
2026-06-24 AAL148 - Jun 24, 23:00 UTCJun 25, 03:44 UTC4h 45m
2026-06-24 AAL148 SFO → JFK Jun 24, 22:55 UTCJun 25, 03:40 UTC4h 45m
2026-06-24 AAL149 DEN → PHL Jun 24, 15:05 UTCJun 24, 21:03 UTC5h 58m
2026-06-24 AAL149 DEN → PHL Jun 24, 15:09 UTCJun 24, 21:04 UTC5h 55m
2026-06-24 AAL28 - Jun 24, 05:44 UTCJun 24, 10:35 UTC4h 50m
2026-06-23 AAL1578 - Jun 23, 20:54 UTCJun 24, 02:45 UTC5h 50m
2026-06-23 AAL12 - Jun 23, 14:15 UTCJun 23, 19:19 UTC5h 5m
2026-06-23 AAL12 LAX → BOS Jun 23, 14:13 UTCJun 23, 19:13 UTC5h 0m
2026-06-23 AAL117 JFK → LAX Jun 23, 03:49 UTCJun 23, 09:20 UTC5h 30m
2026-06-22 AAL307 LAX → JFK Jun 22, 21:25 UTCJun 23, 02:20 UTC4h 55m
2026-06-22 AAL171 - Jun 22, 10:19 UTCJun 22, 15:54 UTC5h 35m
2026-06-21 AAL148 - Jun 21, 22:29 UTCJun 22, 03:19 UTC4h 50m
2026-06-21 AAL149 DEN → PHL Jun 21, 14:59 UTCJun 21, 21:05 UTC6h 5m
2026-06-21 AAL28 LAX → JFK Jun 21, 05:40 UTCJun 21, 10:29 UTC4h 50m
2026-06-20 AAL1578 - Jun 20, 20:34 UTCJun 21, 02:24 UTC5h 50m
2026-06-20 AAL12 - Jun 20, 14:24 UTCJun 20, 19:15 UTC4h 50m
2026-06-20 AAL117 JFK → LAX Jun 20, 01:09 UTCJun 20, 06:54 UTC5h 45m
2026-06-19 AAL16 - Jun 19, 17:49 UTCJun 19, 22:45 UTC4h 55m
2026-06-19 AAL76 JFK → SFO Jun 19, 10:19 UTCJun 19, 16:25 UTC6h 5m
2026-06-18 AAL148 SFO → JFK Jun 18, 23:05 UTCJun 19, 03:52 UTC4h 47m
2026-06-18 AAL148 - Jun 18, 23:05 UTCJun 19, 04:00 UTC4h 54m
2026-06-18 AAL149 DEN → PHL Jun 18, 15:25 UTCJun 18, 21:55 UTC6h 30m
2026-06-17 AAL166 - Jun 17, 20:30 UTCJun 18, 01:10 UTC4h 40m
2026-06-17 AAL179 JFK → SFO Jun 17, 11:50 UTCJun 17, 17:40 UTC5h 50m
2026-06-16 AAL2683 - Jun 16, 19:40 UTCJun 17, 00:35 UTC4h 56m
2026-06-16 AAL2683 - Jun 16, 11:35 UTCJun 16, 17:15 UTC5h 40m
2026-06-16 AAL276 - Jun 16, 04:25 UTCJun 16, 09:10 UTC4h 45m
2026-06-15 AAL15 JFK → SFO Jun 15, 21:14 UTCJun 16, 03:10 UTC5h 55m
2026-06-15 AAL234 SFO → JFK Jun 15, 13:30 UTCJun 15, 18:29 UTC5h 0m
2026-06-15 AAL234 SFO → JFK Jun 15, 13:27 UTCJun 15, 18:25 UTC4h 58m
2026-06-15 AAL177 JFK → SFO Jun 15, 02:30 UTCJun 15, 08:45 UTC6h 15m
2026-06-14 AAL2 - Jun 14, 17:20 UTCJun 14, 22:00 UTC4h 40m
2026-06-14 AAL171 - Jun 14, 10:15 UTCJun 14, 16:00 UTC5h 45m
2026-06-13 AAL166 SFO → JFK Jun 13, 19:35 UTCJun 14, 00:20 UTC4h 45m

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 N106NN page for operator, model, and routing details .

Mode-S A01C37 frequently asked

What is Mode-S code A01C37?
A01C37 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N106NN.
Where is Mode-S A01C37 registered?
Mode-S code A01C37 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 A01C37 broadcasting right now?
Yes. Mode-S A01C37 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A01C37, octal 50016067, decimal 10,492,983.
What flights does A01C37 operate?
Mode-S A01C37 has broadcast 20 distinct callsigns, including AAL171, AAL3, AAL238, AAL149, AAL276.