Apparatus

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sensors Mode-S transponder

A1515B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N184US · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
A1515B
Octal
50250533
Decimal
10,572,123
Country
US
Tail
N184US
Type
A321
Broadcasting now · callsign AAL2977 · 32,000 ft
Flights observed
459
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Current position

A1515B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1515B 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
AAL2852 American Airlines 6 2026-04-17
AAL2407 - 6 2026-06-30
AAL2570 - 5 2026-06-27
AAL757 American Airlines 4 2026-05-22
AAL3224 American Airlines 4 2026-05-05
AAL3176 - 4 2026-07-17
AAL2834 American Airlines 4 2026-05-07
AAL2775 American Airlines 4 2026-04-28
AAL2584 American Airlines 4 2026-06-08
AAL2525 American Airlines 4 2026-05-26
AAL2502 American Airlines 4 2026-05-13
AAL2109 American Airlines 4 2026-06-21
AAL1979 American Airlines 4 2026-05-02
AAL1177 American Airlines 4 2026-04-15
AAL1167 - 4 2026-07-11
AAL977 American Airlines 3 2026-06-19
AAL895 - 3 2026-06-17
AAL777 American Airlines 3 2026-07-03
AAL607 - 3 2026-06-23
AAL3100 American Airlines 3 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 AAL215 CUN → ORD Jul 17, 20:11 UTCJul 18, 00:15 UTC4h 4m
2026-07-17 AAL215 - Jul 17, 20:15 UTCJul 18, 00:15 UTC4h 0m
2026-07-17 AAL492 - Jul 17, 15:20 UTCJul 17, 18:50 UTC3h 30m
2026-07-17 AAL938 MCO → ORD Jul 17, 10:50 UTCJul 17, 13:10 UTC2h 20m
2026-07-17 AAL3176 - Jul 17, 01:59 UTCJul 17, 04:14 UTC2h 15m
2026-07-16 AAL2474 DFW → ORD Jul 16, 22:19 UTCJul 17, 00:25 UTC2h 5m
2026-07-16 AAL2238 - Jul 16, 17:45 UTCJul 16, 20:19 UTC2h 35m
2026-07-16 AAL2238 ONT → DFW Jul 16, 17:40 UTCJul 16, 20:16 UTC2h 36m
2026-07-16 AAL2238 DFW → ONT Jul 16, 13:49 UTCJul 16, 16:35 UTC2h 45m
2026-07-16 AAL2003 SEA → DFW Jul 16, 07:05 UTCJul 16, 10:29 UTC3h 25m
2026-07-15 AAL2107 - Jul 15, 20:05 UTCJul 16, 00:50 UTC4h 45m
2026-07-15 AAL2107 CLT → SEA Jul 15, 20:00 UTCJul 16, 00:49 UTC4h 49m
2026-07-15 AAL1853 - Jul 15, 17:00 UTCJul 15, 18:30 UTC1h 30m
2026-07-15 AAL1912 - Jul 15, 01:00 UTCJul 15, 02:30 UTC1h 30m
2026-07-14 AAL1443 - Jul 14, 22:15 UTCJul 14, 23:45 UTC1h 29m
2026-07-14 AAL1443 - Jul 14, 19:30 UTCJul 14, 21:05 UTC1h 35m
2026-07-14 AAL1857 - Jul 14, 15:30 UTCJul 14, 17:50 UTC2h 20m
2026-07-14 AAL2558 - Jul 14, 11:05 UTCJul 14, 13:50 UTC2h 45m
2026-07-14 AAL2558 FLL → DFW Jul 14, 11:05 UTCJul 14, 13:44 UTC2h 39m
2026-07-14 AAL2946 DFW → FLL Jul 14, 04:55 UTCJul 14, 07:15 UTC2h 20m
2026-07-13 AAL2815 - Jul 13, 23:55 UTCJul 14, 02:05 UTC2h 10m
2026-07-13 AAL2815 CLT → DFW Jul 13, 23:52 UTCJul 14, 02:06 UTC2h 14m
2026-07-13 AAL1696 - Jul 13, 18:55 UTCJul 13, 21:00 UTC2h 5m
2026-07-13 AAL2746 - Jul 13, 14:10 UTCJul 13, 16:55 UTC2h 45m
2026-07-13 AAL613 ORD → LAX Jul 13, 02:25 UTCJul 13, 05:55 UTC3h 30m
2026-07-12 AAL3303 - Jul 12, 20:50 UTCJul 13, 00:25 UTC3h 35m
2026-07-12 AAL1625 PHX → PDX Jul 12, 17:20 UTCJul 12, 19:30 UTC2h 10m
2026-07-12 AAL2315 - Jul 12, 11:10 UTCJul 12, 15:55 UTC4h 45m
2026-07-12 AAL1054 - Jul 12, 02:55 UTCJul 12, 05:30 UTC2h 35m
2026-07-11 AAL1167 DFW → MIA Jul 11, 22:55 UTCJul 12, 01:26 UTC2h 31m
2026-07-11 AAL1167 - Jul 11, 22:55 UTCJul 12, 01:25 UTC2h 30m
2026-07-11 AAL707 - Jul 11, 17:40 UTCJul 11, 18:45 UTC1h 5m
2026-07-11 AAL707 SEA → DFW Jul 11, 17:38 UTCJul 11, 20:56 UTC3h 18m
2026-07-11 AAL2523 - Jul 11, 11:55 UTCJul 11, 15:45 UTC3h 50m
2026-07-11 AAL1433 - Jul 11, 01:45 UTCJul 11, 05:15 UTC3h 30m
2026-07-10 AAL1502 - Jul 10, 20:20 UTCJul 11, 00:45 UTC4h 25m
2026-07-10 AAL1857 - Jul 10, 15:55 UTCJul 10, 18:05 UTC2h 10m
2026-07-10 AAL1857 DFW → CLT Jul 10, 15:50 UTCJul 10, 17:56 UTC2h 6m
2026-07-10 AAL1403 - Jul 10, 11:40 UTCJul 10, 14:30 UTC2h 50m
2026-07-10 AAL2251 - Jul 10, 01:05 UTCJul 10, 03:35 UTC2h 30m
2026-07-09 AAL2501 - Jul 9, 21:55 UTCJul 9, 23:30 UTC1h 35m
2026-07-09 AAL2501 - Jul 9, 19:20 UTCJul 9, 20:45 UTC1h 25m
2026-07-09 AAL1285 - Jul 9, 15:40 UTCJul 9, 17:45 UTC2h 5m
2026-07-09 AAL1704 - Jul 9, 12:40 UTCJul 9, 13:50 UTC1h 10m
2026-07-09 AAL1704 TPA → CLT Jul 9, 12:38 UTCJul 9, 13:50 UTC1h 12m
2026-07-09 AAL2022 - Jul 9, 02:00 UTCJul 9, 03:20 UTC1h 20m
2026-07-06 AAL1817 - Jul 6, 01:30 UTCJul 6, 02:00 UTC30m
2026-07-04 AAL1877 - Jul 4, 17:50 UTCJul 4, 19:20 UTC1h 30m
2026-07-04 AAL1877 - Jul 4, 14:45 UTCJul 4, 16:35 UTC1h 50m
2026-07-04 AAL1266 - Jul 4, 11:40 UTCJul 4, 13:15 UTC1h 35m

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 N184US page for operator, model, and routing details .

Mode-S A1515B frequently asked

What is Mode-S code A1515B?
A1515B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N184US.
Where is Mode-S A1515B registered?
Mode-S code A1515B 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 A1515B broadcasting right now?
Yes. Mode-S A1515B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1515B, octal 50250533, decimal 10,572,123.
What flights does A1515B operate?
Mode-S A1515B has broadcast 20 distinct callsigns, including AAL2852, AAL2407, AAL2570, AAL757, AAL3224.