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
No current signal · last broadcast Jul 26, 06:15 UTC
Flights observed
504
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 06:15 UTC

Last known position

Most recent position reported by Mode-S A1515B.

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
AAL2977 American Airlines 5 2026-07-19
AAL2570 - 5 2026-06-27
AAL2238 American Airlines 5 2026-07-21
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
AAL1050 American Airlines 4 2026-07-18
AAL977 American Airlines 3 2026-06-19
AAL895 - 3 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2343 ORD → SAN Jul 26, 03:45 UTCJul 26, 06:05 UTC2h 20m
2026-07-26 AAL2343 ORD → SAN Jul 26, 03:41 UTCJul 26, 06:05 UTC2h 24m
2026-07-25 AAL716P CLT → MUC Jul 25, 23:48 UTCJul 26, 02:18 UTC2h 30m
2026-07-25 AAL716P CLT → MUC Jul 25, 23:50 UTCJul 26, 02:20 UTC2h 30m
2026-07-25 AAL3229 PHL → TPA Jul 25, 19:40 UTCJul 25, 22:05 UTC2h 25m
2026-07-25 AAL1250 PHL → PBI Jul 25, 15:30 UTCJul 25, 18:05 UTC2h 35m
2026-07-25 AAL2843 CLT → ORD Jul 25, 12:05 UTCJul 25, 13:30 UTC1h 25m
2026-07-25 AAL2514 PHX → DFW Jul 25, 05:25 UTCJul 25, 09:55 UTC4h 30m
2026-07-25 AAL2514 PHX → DFW Jul 25, 05:24 UTCJul 25, 09:57 UTC4h 33m
2026-07-24 AAL3072 SEA → DFW Jul 24, 23:26 UTCJul 25, 02:34 UTC3h 8m
2026-07-24 AAL3072 SEA → DFW Jul 24, 23:30 UTCJul 25, 02:35 UTC3h 5m
2026-07-24 AAL3314 SMF → DFW Jul 24, 06:55 UTCJul 24, 09:50 UTC2h 55m
2026-07-24 AAL3314 SMF → DFW Jul 24, 02:35 UTCJul 24, 05:35 UTC3h 0m
2026-07-23 AAL2459 CID → CLT Jul 23, 22:25 UTCJul 24, 00:45 UTC2h 20m
2026-07-23 AAL2459 CID → CLT Jul 23, 22:24 UTCJul 24, 01:00 UTC2h 36m
2026-07-23 AAL2459 CID → CLT Jul 23, 18:40 UTCJul 23, 21:10 UTC2h 30m
2026-07-23 AAL2305 - Jul 23, 14:00 UTCJul 23, 16:55 UTC2h 55m
2026-07-23 AAL2411 SFO → PHX Jul 23, 02:55 UTCJul 23, 07:35 UTC4h 40m
2026-07-23 AAL2411 SFO → PHX Jul 23, 02:51 UTCJul 23, 07:36 UTC4h 45m
2026-07-22 AAL2100 MCI → DFW Jul 22, 23:45 UTCJul 23, 01:00 UTC1h 15m
2026-07-22 AAL2100 MCI → DFW Jul 22, 21:35 UTCJul 22, 22:35 UTC1h 0m
2026-07-22 AAL793 - Jul 22, 18:10 UTCJul 22, 19:45 UTC1h 35m
2026-07-22 AAL793 PHL → CLT Jul 22, 18:07 UTCJul 22, 19:39 UTC1h 32m
2026-07-22 AAL1511 PHX → PHL Jul 22, 12:10 UTCJul 22, 16:15 UTC4h 5m
2026-07-21 AAL1155 LAS → PHL Jul 21, 21:55 UTCJul 21, 23:50 UTC1h 55m
2026-07-21 AAL2238 MYR → DFW Jul 21, 17:40 UTCJul 21, 20:15 UTC2h 35m
2026-07-21 AAL2238 MYR → DFW Jul 21, 13:35 UTCJul 21, 16:00 UTC2h 25m
2026-07-21 AAL2429 DFW → ORD Jul 21, 08:20 UTCJul 21, 11:45 UTC3h 25m
2026-07-21 AAL3223 MIA → CMH Jul 21, 03:00 UTCJul 21, 06:20 UTC3h 20m
2026-07-20 AAL2041 CLT → MSP Jul 20, 22:50 UTCJul 21, 01:40 UTC2h 50m
2026-07-20 AAL2041 CLT → MSP Jul 20, 22:46 UTCJul 21, 01:35 UTC2h 49m
2026-07-20 AAL2656 STL → LGA Jul 20, 19:13 UTCJul 20, 21:13 UTC2h 0m
2026-07-20 AAL1649 AUS → TPA Jul 20, 13:45 UTCJul 20, 21:15 UTC7h 30m
2026-07-20 AAL2323 ORD → MIA Jul 20, 02:10 UTCJul 20, 04:50 UTC2h 40m
2026-07-19 AAL1800 BOS → CLT Jul 19, 22:00 UTCJul 20, 00:20 UTC2h 20m
2026-07-19 AAL2739 MIA → CUR Jul 19, 18:00 UTCJul 19, 20:25 UTC2h 25m
2026-07-19 AAL1250 PHL → PBI Jul 19, 13:55 UTCJul 19, 16:35 UTC2h 40m
2026-07-19 AAL2977 BOS → DCA Jul 19, 06:25 UTCJul 19, 09:50 UTC3h 25m
2026-07-19 AAL2977 BOS → DCA Jul 19, 01:20 UTCJul 19, 05:20 UTC4h 0m
2026-07-18 AAL1050 DFW → BUF Jul 18, 19:50 UTCJul 18, 23:30 UTC3h 40m
2026-07-18 AAL1050 DFW → BUF Jul 18, 19:46 UTCJul 18, 23:33 UTC3h 47m
2026-07-18 AAL2012 - Jul 18, 13:30 UTCJul 18, 16:50 UTC3h 20m
2026-07-18 AAL2012 ORD → LAX Jul 18, 13:27 UTCJul 18, 16:56 UTC3h 29m
2026-07-18 AAL2977 BOS → DCA Jul 18, 08:05 UTCJul 18, 11:35 UTC3h 30m
2026-07-18 AAL2977 BOS → DCA Jul 18, 03:15 UTCJul 18, 07:05 UTC3h 50m
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

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?
No active broadcast right now. Last signal was Jul 26, 06:15 UTC.
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, AAL2977, AAL2570, AAL2238.