Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A57D42

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N453AA · AIRBUS A-321neo · operated by AMERICAN AIRLINES INC

Hex
A57D42
Octal
51276502
Decimal
10,845,506
Country
US
Tail
N453AA
Type
A21N
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
461
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A57D42.

Country allocation

The ICAO 24-bit address A57D42 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
AAL693 - 9 2026-06-15
AAL1665 - 7 2026-07-20
AAL692 - 6 2026-07-10
AAL31 - 6 2026-06-27
AAL2405 - 6 2026-07-18
AAL1981 American Airlines 6 2026-07-22
AAL162 - 6 2026-06-28
AAL1471 American Airlines 6 2026-07-21
AAL767 - 5 2026-04-13
AAL2721 American Airlines 5 2026-06-05
AAL2660 - 5 2026-07-10
AAL2659 American Airlines 5 2026-07-22
AAL205 - 5 2026-07-17
AAL988 American Airlines 4 2026-05-02
AAL778 American Airlines 4 2026-07-18
AAL675 - 4 2026-07-09
AAL646 American Airlines 4 2026-07-21
AAL645 American Airlines 4 2026-06-13
AAL3220 American Airlines 4 2026-05-10
AAL3202 American Airlines 4 2026-04-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL3016 DFW → MEM Jul 26, 18:30 UTCJul 26, 22:30 UTC4h 0m
2026-07-26 AAL713 DCA → PHX Jul 26, 11:40 UTCJul 26, 16:05 UTC4h 25m
2026-07-25 AAL483 PHX → DFW Jul 25, 20:20 UTCJul 26, 00:40 UTC4h 20m
2026-07-25 AAL483 PHX → DFW Jul 25, 14:30 UTCJul 25, 18:45 UTC4h 15m
2026-07-25 AAL2823 BOS → DFW Jul 25, 01:25 UTCJul 25, 03:45 UTC2h 20m
2026-07-24 AAL2823 BOS → DFW Jul 24, 21:15 UTCJul 24, 23:50 UTC2h 35m
2026-07-24 AAL1102 MIA → SFO Jul 24, 18:18 UTCJul 24, 19:36 UTC1h 18m
2026-07-24 AAL1102 MIA → SFO Jul 24, 18:20 UTCJul 24, 19:40 UTC1h 20m
2026-07-24 AAL1157 MIA → CUN Jul 24, 15:30 UTCJul 24, 16:45 UTC1h 15m
2026-07-24 AAL2593 MSP → DFW Jul 24, 12:50 UTCJul 24, 13:30 UTC40m
2026-07-24 AAL1879 CLT → MCO Jul 24, 03:50 UTCJul 24, 04:55 UTC1h 5m
2026-07-23 AAL2529 ORD → MCO Jul 23, 21:12 UTCJul 24, 01:35 UTC4h 23m
2026-07-23 AAL2529 ORD → MCO Jul 23, 21:15 UTCJul 24, 01:40 UTC4h 25m
2026-07-23 AAL2529 ORD → MCO Jul 23, 13:50 UTCJul 23, 18:55 UTC5h 5m
2026-07-23 AAL2529 ORD → MCO Jul 23, 13:49 UTCJul 23, 18:51 UTC5h 2m
2026-07-23 AAL1834 IND → PHL Jul 23, 11:15 UTCJul 23, 12:10 UTC55m
2026-07-23 AAL1834 IND → PHL Jul 23, 11:10 UTCJul 23, 12:07 UTC57m
2026-07-23 AAL2713 SFO → PHL Jul 23, 03:35 UTCJul 23, 04:25 UTC50m
2026-07-23 AAL2713 SFO → PHL Jul 23, 03:32 UTCJul 23, 04:22 UTC50m
2026-07-22 AAL1703 PVD → CLT Jul 22, 23:50 UTCJul 23, 01:55 UTC2h 5m
2026-07-22 AAL407 ORD → BOS Jul 22, 15:23 UTCJul 22, 21:03 UTC5h 40m
2026-07-22 AAL407 ORD → BOS Jul 22, 15:25 UTCJul 22, 21:05 UTC5h 40m
2026-07-22 AAL1981 SBA → DFW Jul 22, 02:40 UTCJul 22, 05:25 UTC2h 45m
2026-07-22 AAL1981 SBA → DFW Jul 22, 02:38 UTCJul 22, 07:52 UTC5h 14m
2026-07-22 AAL2659 SNA → DFW Jul 22, 00:05 UTCJul 22, 01:05 UTC1h 0m
2026-07-21 AAL2659 SNA → DFW Jul 21, 21:55 UTCJul 21, 22:50 UTC55m
2026-07-21 AAL646 PHL → MCO Jul 21, 15:40 UTCJul 21, 20:15 UTC4h 35m
2026-07-21 AAL2129 MIA → PHL Jul 21, 11:00 UTCJul 21, 13:20 UTC2h 20m
2026-07-21 AAL1471 PHX → TPA Jul 21, 04:23 UTCJul 21, 09:24 UTC5h 1m
2026-07-21 AAL1471 PHX → TPA Jul 21, 04:25 UTCJul 21, 09:25 UTC5h 0m
2026-07-20 AAL2107 - Jul 20, 20:45 UTCJul 21, 01:35 UTC4h 49m
2026-07-20 AAL1665 - Jul 20, 15:15 UTCJul 20, 19:10 UTC3h 55m
2026-07-20 AAL1665 LAS → CLT Jul 20, 15:13 UTCJul 20, 19:10 UTC3h 57m
2026-07-19 AAL3040 - Jul 19, 21:15 UTCJul 20, 01:35 UTC4h 20m
2026-07-19 AAL3040 PHL → PHL Jul 19, 21:05 UTCJul 19, 21:10 UTC5m
2026-07-19 AAL1151 - Jul 19, 14:15 UTCJul 19, 19:10 UTC4h 55m
2026-07-18 AAL778 SDQ → MIA Jul 18, 18:45 UTCJul 18, 23:25 UTC4h 40m
2026-07-18 AAL2405 - Jul 18, 15:30 UTCJul 18, 17:05 UTC1h 35m
2026-07-18 AAL2405 - Jul 18, 12:20 UTCJul 18, 14:05 UTC1h 45m
2026-07-18 AAL1545 PWM → DCA Jul 18, 05:10 UTCJul 18, 10:30 UTC5h 20m
2026-07-17 AAL2663 PHL → SFO Jul 17, 21:55 UTCJul 18, 03:20 UTC5h 26m
2026-07-17 AAL2300 - Jul 17, 16:10 UTCJul 17, 20:15 UTC4h 5m
2026-07-17 AAL848 - Jul 17, 13:00 UTCJul 17, 14:15 UTC1h 15m
2026-07-17 AAL205 - Jul 17, 01:59 UTCJul 17, 02:30 UTC30m
2026-07-16 AAL1719 - Jul 16, 21:19 UTCJul 16, 23:49 UTC2h 30m
2026-07-16 AAL1719 LAX → YVR Jul 16, 17:45 UTCJul 16, 20:05 UTC2h 20m
2026-07-16 AAL2070 - Jul 16, 11:25 UTCJul 16, 15:40 UTC4h 15m
2026-07-16 AAL1330 - Jul 16, 06:05 UTCJul 16, 09:40 UTC3h 35m
2026-07-15 AAL186 - Jul 15, 21:35 UTCJul 16, 00:00 UTC2h 25m
2026-07-15 AAL186 CUN → PHX Jul 15, 21:30 UTCJul 16, 01:19 UTC3h 49m

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 N453AA page for operator, model, and routing details .

Mode-S A57D42 frequently asked

What is Mode-S code A57D42?
A57D42 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N453AA.
Where is Mode-S A57D42 registered?
Mode-S code A57D42 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 A57D42 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A57D42, octal 51276502, decimal 10,845,506.
What flights does A57D42 operate?
Mode-S A57D42 has broadcast 20 distinct callsigns, including AAL693, AAL1665, AAL692, AAL31, AAL2405.