Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A515AD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N427AN · AIRBUS A-321neo · operated by AMERICAN AIRLINES INC

Hex
A515AD
Octal
51212655
Decimal
10,818,989
Country
US
Tail
N427AN
Type
A21N
No current signal · last broadcast 26d ago
Flights observed
295
Distinct callsigns
20
Country
US
Last broadcast
26d ago

Last known position

Most recent position reported by Mode-S A515AD.

Country allocation

The ICAO 24-bit address A515AD 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
AAL824 American Airlines 5 2026-05-11
AAL422 American Airlines 5 2026-06-10
AAL667 American Airlines 4 2026-06-09
AAL3234 American Airlines 4 2026-06-09
AAL3172 - 4 2026-06-17
AAL31 American Airlines 4 2026-06-05
AAL246 American Airlines 4 2026-05-11
AAL2368 American Airlines 4 2026-06-04
AAL2319 American Airlines 4 2026-04-14
AAL1570 American Airlines 4 2026-04-13
AAL1558 American Airlines 4 2026-05-31
AAL918 American Airlines 3 2026-04-18
AAL694 American Airlines 3 2026-05-08
AAL693 American Airlines 3 2026-05-07
AAL59 American Airlines 3 2026-06-13
AAL510 American Airlines 3 2026-06-05
AAL500 American Airlines 3 2026-06-12
AAL428 American Airlines 3 2026-04-15
AAL385 American Airlines 3 2026-05-31
AAL3245 American Airlines 3 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-17 AAL9789 - Jun 17, 21:10 UTCJun 18, 00:55 UTC3h 45m
2026-06-17 AAL3172 - Jun 17, 15:15 UTCJun 17, 19:25 UTC4h 10m
2026-06-17 AAL770 - Jun 17, 11:15 UTCJun 17, 12:45 UTC1h 30m
2026-06-16 AAL1988 - Jun 16, 21:35 UTCJun 17, 01:45 UTC4h 10m
2026-06-16 AAL2888 - Jun 16, 13:55 UTCJun 16, 14:45 UTC50m
2026-06-16 AAL2888 - Jun 16, 09:50 UTCJun 16, 10:04 UTC15m
2026-06-16 AAL1313 - Jun 16, 07:40 UTCJun 16, 07:55 UTC15m
2026-06-16 AAL1313 - Jun 16, 02:54 UTCJun 16, 03:35 UTC40m
2026-06-16 AAL1313 LAX → HNL Jun 16, 02:51 UTCJun 16, 07:57 UTC5h 6m
2026-06-15 AAL778 SDQ → MIA Jun 15, 18:45 UTCJun 15, 23:54 UTC5h 10m
2026-06-15 AAL2405 - Jun 15, 15:19 UTCJun 15, 16:55 UTC1h 35m
2026-06-15 AAL2405 MIA → RDU Jun 15, 12:10 UTCJun 15, 13:50 UTC1h 40m
2026-06-15 AAL1471 SEA → MIA Jun 15, 05:35 UTCJun 15, 10:40 UTC5h 5m
2026-06-15 AAL2009 DFW → SEA Jun 15, 00:24 UTCJun 15, 04:10 UTC3h 45m
2026-06-15 AAL2009 DFW → SEA Jun 15, 00:21 UTCJun 15, 04:17 UTC3h 56m
2026-06-14 AAL1709 - Jun 14, 20:15 UTCJun 14, 22:35 UTC2h 20m
2026-06-14 AAL1709 CLT → DFW Jun 14, 20:12 UTCJun 14, 22:29 UTC2h 17m
2026-06-14 AAL1208 - Jun 14, 13:40 UTCJun 14, 17:30 UTC3h 50m
2026-06-14 AAL58 KOA → LAX Jun 14, 05:55 UTCJun 14, 06:40 UTC45m
2026-06-14 AAL58 KOA → LAX Jun 14, 01:40 UTCJun 14, 01:55 UTC15m
2026-06-13 AAL663 ATL → ORD Jun 13, 17:40 UTCJun 13, 18:50 UTC1h 10m
2026-06-13 AAL663 ATL → ORD Jun 13, 17:35 UTCJun 13, 23:34 UTC5h 59m
2026-06-13 AAL664 - Jun 13, 12:05 UTCJun 13, 13:35 UTC1h 30m
2026-06-13 AAL664 - Jun 13, 08:00 UTCJun 13, 08:10 UTC10m
2026-06-13 AAL59 LAX → KOA Jun 13, 01:40 UTCJun 13, 01:50 UTC10m
2026-06-12 AAL59 LAX → KOA Jun 12, 20:40 UTCJun 12, 21:05 UTC25m
2026-06-12 AAL59 LAX → KOA Jun 12, 20:39 UTCJun 13, 01:56 UTC5h 17m
2026-06-12 AAL500 SFO → PHL Jun 12, 14:50 UTCJun 12, 17:35 UTC2h 45m
2026-06-12 AAL1226 MIA → DFW Jun 12, 09:40 UTCJun 12, 12:15 UTC2h 35m
2026-06-12 AAL2936 - Jun 12, 02:30 UTCJun 12, 04:40 UTC2h 10m
2026-06-11 AAL857 PHL → MBJ Jun 11, 21:35 UTCJun 12, 00:00 UTC2h 25m
2026-06-11 AAL857 PHL → MBJ Jun 11, 20:50 UTCJun 11, 23:59 UTC3h 9m
2026-06-11 AAL1075 LGA → RDU Jun 11, 16:40 UTCJun 11, 18:50 UTC2h 10m
2026-06-11 AAL1075 LGA → RDU Jun 11, 16:35 UTCJun 11, 19:40 UTC3h 5m
2026-06-11 AAL2635 ONT → DFW Jun 11, 08:05 UTCJun 11, 13:05 UTC5h 0m
2026-06-11 AAL2426 MIA → SFO Jun 11, 00:55 UTCJun 11, 06:20 UTC5h 25m
2026-06-11 AAL2426 MIA → SFO Jun 11, 00:52 UTCJun 11, 06:19 UTC5h 27m
2026-06-10 AAL422 DCA → MIA Jun 10, 17:55 UTCJun 10, 20:00 UTC2h 5m
2026-06-10 AAL422 DCA → MIA Jun 10, 17:53 UTCJun 10, 19:56 UTC2h 3m
2026-06-09 AAL667 SEA → DFW Jun 9, 22:40 UTCJun 10, 00:40 UTC2h 0m
2026-06-09 AAL1332 DEN → PHX Jun 9, 20:10 UTCJun 9, 20:40 UTC30m
2026-06-09 AAL3234 SEA → ORD Jun 9, 16:50 UTCJun 9, 17:20 UTC30m
2026-06-09 AAL3234 SEA → ORD Jun 9, 16:41 UTCJun 9, 17:54 UTC1h 13m
2026-06-09 AAL422 DCA → MIA Jun 9, 12:15 UTCJun 9, 14:15 UTC2h 0m
2026-06-09 AAL422 DCA → MIA Jun 9, 12:15 UTCJun 9, 14:18 UTC2h 3m
2026-06-09 AAL667 SEA → DFW Jun 9, 00:45 UTCJun 9, 03:00 UTC2h 15m
2026-06-08 AAL2517 LAX → DFW Jun 8, 16:50 UTCJun 8, 22:40 UTC5h 50m
2026-06-08 AAL2184 PHL → MIA Jun 8, 12:20 UTCJun 8, 14:25 UTC2h 5m
2026-06-08 AAL2184 PHL → MIA Jun 8, 12:17 UTCJun 8, 14:24 UTC2h 7m
2026-06-08 AAL2076 YHZ → PHL Jun 8, 01:57 UTCJun 8, 04:05 UTC2h 8m

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 N427AN page for operator, model, and routing details .

Mode-S A515AD frequently asked

What is Mode-S code A515AD?
A515AD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N427AN.
Where is Mode-S A515AD registered?
Mode-S code A515AD 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 A515AD broadcasting right now?
No active broadcast right now. Last signal was 26d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A515AD, octal 51212655, decimal 10,818,989.
What flights does A515AD operate?
Mode-S A515AD has broadcast 20 distinct callsigns, including AAL824, AAL422, AAL667, AAL3234, AAL3172.