Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ADC531

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N987AM · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
ADC531
Octal
53342461
Decimal
11,388,209
Country
US
Tail
N987AM
Type
A321
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
533
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S ADC531.

Country allocation

The ICAO 24-bit address ADC531 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
AAL2283 - 8 2026-07-18
AAL727 - 7 2026-07-20
AAL1150 - 7 2026-07-16
AAL420 American Airlines 5 2026-05-03
AAL2852 American Airlines 5 2026-05-11
AAL2517 American Airlines 5 2026-04-14
AAL2003 American Airlines 5 2026-05-14
AAL1847 American Airlines 5 2026-07-21
AAL1629 American Airlines 5 2026-07-24
AAL783 American Airlines 4 2026-05-29
AAL3282 - 4 2026-04-13
AAL3045 - 4 2026-06-27
AAL2988 - 4 2026-07-04
AAL2924 American Airlines 4 2026-04-28
AAL2830 American Airlines 4 2026-06-10
AAL2760 - 4 2026-07-16
AAL2461 American Airlines 4 2026-04-15
AAL2409 American Airlines 4 2026-06-05
AAL2388 - 4 2026-07-13
AAL2195 - 4 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL1285 DFW → BOS Jul 26, 22:00 UTCJul 26, 22:15 UTC15m
2026-07-26 AAL1285 DFW → BOS Jul 26, 18:30 UTCJul 26, 20:35 UTC2h 5m
2026-07-26 AAL1266 MSY → CLT Jul 26, 12:50 UTCJul 26, 14:15 UTC1h 25m
2026-07-26 AAL1266 MSY → CLT Jul 26, 12:50 UTCJul 26, 14:21 UTC1h 31m
2026-07-26 AAL608 PHL → MCO Jul 26, 03:45 UTCJul 26, 05:20 UTC1h 35m
2026-07-26 AAL608 PHL → MCO Jul 26, 03:43 UTCJul 26, 05:14 UTC1h 31m
2026-07-26 AAL842 PHX → SFO Jul 26, 00:05 UTCJul 26, 02:10 UTC2h 5m
2026-07-25 AAL842 PHX → SFO Jul 25, 18:20 UTCJul 25, 20:20 UTC2h 0m
2026-07-25 AAL3009 EGE → DFW Jul 25, 13:10 UTCJul 25, 16:45 UTC3h 35m
2026-07-25 AAL1133 DFW → RIC Jul 25, 01:45 UTCJul 25, 03:35 UTC1h 50m
2026-07-25 AAL1133 DFW → RIC Jul 25, 01:40 UTCJul 25, 03:33 UTC1h 53m
2026-07-24 AAL1629 ORD → CLT Jul 24, 21:30 UTCJul 25, 00:10 UTC2h 40m
2026-07-24 AAL1629 ORD → CLT Jul 24, 21:25 UTCJul 25, 00:09 UTC2h 44m
2026-07-24 AAL1629 ORD → CLT Jul 24, 17:00 UTCJul 24, 19:30 UTC2h 30m
2026-07-24 AAL1018 LAS → AUS Jul 24, 13:22 UTCJul 24, 15:26 UTC2h 4m
2026-07-24 AAL1018 LAS → AUS Jul 24, 13:25 UTCJul 24, 15:30 UTC2h 5m
2026-07-24 AAL3239 LGA → TPA Jul 24, 03:50 UTCJul 24, 05:45 UTC1h 55m
2026-07-24 AAL3239 LGA → TPA Jul 24, 03:48 UTCJul 24, 05:44 UTC1h 56m
2026-07-23 AAL2385 BGR → DCA Jul 23, 23:10 UTCJul 24, 01:25 UTC2h 15m
2026-07-23 AAL1660 PHL → ORD Jul 23, 21:00 UTCJul 23, 22:05 UTC1h 5m
2026-07-23 AAL1665 LAS → CLT Jul 23, 15:25 UTCJul 23, 18:15 UTC2h 50m
2026-07-23 AAL1665 LAS → CLT Jul 23, 15:21 UTCJul 23, 19:18 UTC3h 57m
2026-07-23 AAL1771 BOS → MIA Jul 23, 00:50 UTCJul 23, 03:00 UTC2h 10m
2026-07-22 AAL2014 - Jul 22, 20:55 UTCJul 22, 23:25 UTC2h 30m
2026-07-22 AAL2014 DFW → FLL Jul 22, 17:25 UTCJul 22, 19:50 UTC2h 25m
2026-07-22 AAL2521 YYC → DFW Jul 22, 12:55 UTCJul 22, 16:00 UTC3h 5m
2026-07-22 AAL511 PHL → ORD Jul 22, 00:30 UTCJul 22, 03:50 UTC3h 20m
2026-07-21 AAL1215 DFW → PVR Jul 21, 16:20 UTCJul 21, 21:50 UTC5h 30m
2026-07-21 AAL1847 STL → LGA Jul 21, 11:45 UTCJul 21, 14:40 UTC2h 55m
2026-07-21 AAL1847 STL → LGA Jul 21, 10:05 UTCJul 21, 10:15 UTC10m
2026-07-21 AAL702 DFW → SJU Jul 21, 04:55 UTCJul 21, 05:15 UTC20m
2026-07-21 AAL702 DFW → SJU Jul 21, 00:55 UTCJul 21, 03:25 UTC2h 30m
2026-07-20 AAL727 SEA → DFW Jul 20, 01:54 UTCJul 20, 05:11 UTC3h 17m
2026-07-20 AAL727 SEA → DFW Jul 20, 01:55 UTCJul 20, 05:15 UTC3h 20m
2026-07-19 AAL727 DFW → SEA Jul 19, 21:00 UTCJul 20, 00:25 UTC3h 25m
2026-07-19 AAL2407 - Jul 19, 17:15 UTCJul 19, 19:25 UTC2h 10m
2026-07-19 AAL2310 MIA → LGA Jul 19, 14:55 UTCJul 19, 15:50 UTC55m
2026-07-19 AAL2310 MIA → LGA Jul 19, 12:25 UTCJul 19, 13:20 UTC55m
2026-07-19 AAL849 DFW → BOS Jul 19, 07:00 UTCJul 19, 10:30 UTC3h 30m
2026-07-19 AAL3012 - Jul 19, 00:05 UTCJul 19, 03:20 UTC3h 15m
2026-07-18 AAL753 LAX → ATL Jul 18, 17:35 UTCJul 18, 21:45 UTC4h 10m
2026-07-18 AAL1154 DFW → LAX Jul 18, 12:45 UTCJul 18, 15:20 UTC2h 35m
2026-07-18 AAL2283 - Jul 18, 06:55 UTCJul 18, 10:15 UTC3h 20m
2026-07-18 AAL2283 DFW → PDX Jul 18, 02:09 UTCJul 18, 05:30 UTC3h 21m
2026-07-17 AAL1595 BOS → DFW Jul 17, 21:15 UTCJul 18, 00:35 UTC3h 20m
2026-07-17 AAL1595 DFW → BOS Jul 17, 15:44 UTCJul 17, 18:55 UTC3h 10m
2026-07-17 AAL3002 - Jul 17, 12:19 UTCJul 17, 13:05 UTC45m
2026-07-17 AAL3002 IAH → DFW Jul 17, 12:14 UTCJul 17, 13:02 UTC48m
2026-07-17 AAL1840 - Jul 17, 01:29 UTCJul 17, 03:30 UTC2h 0m
2026-07-17 AAL1840 CLT → IAH Jul 17, 01:26 UTCJul 17, 03:28 UTC2h 2m

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 N987AM page for operator, model, and routing details .

Mode-S ADC531 frequently asked

What is Mode-S code ADC531?
ADC531 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N987AM.
Where is Mode-S ADC531 registered?
Mode-S code ADC531 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 ADC531 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADC531, octal 53342461, decimal 11,388,209.
What flights does ADC531 operate?
Mode-S ADC531 has broadcast 20 distinct callsigns, including AAL2283, AAL727, AAL1150, AAL420, AAL2852.