Apparatus

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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
Broadcasting now · callsign AAL2105 · 34,000 ft
Flights observed
403
Distinct callsigns
20
Country
US
Last broadcast
47m ago

Current position

A57D42 is currently broadcasting. Map zoomed to live position.

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
AAL692 - 6 2026-07-10
AAL31 - 6 2026-06-27
AAL162 - 6 2026-06-28
AAL767 - 5 2026-04-13
AAL2721 American Airlines 5 2026-06-05
AAL2660 - 5 2026-07-10
AAL1665 - 5 2026-07-02
AAL988 American Airlines 4 2026-05-02
AAL675 - 4 2026-07-09
AAL645 American Airlines 4 2026-06-13
AAL3220 American Airlines 4 2026-05-10
AAL3202 American Airlines 4 2026-04-14
AAL2882 American Airlines 4 2026-04-17
AAL2405 - 4 2026-06-28
AAL2298 American Airlines 4 2026-04-18
AAL2105 - 4 2026-07-14
AAL205 - 4 2026-06-29
AAL1988 American Airlines 4 2026-06-09
AAL1981 - 4 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAL2105 - Jul 14, 06:00 UTCJul 14, 06:30 UTC30m
2026-07-14 AAL2105 MCO → DFW Jul 14, 01:05 UTCJul 14, 04:00 UTC2h 55m
2026-07-13 AAL2105 - Jul 13, 23:00 UTCJul 13, 23:35 UTC35m
2026-07-13 AAL2105 - Jul 13, 16:20 UTCJul 13, 20:30 UTC4h 10m
2026-07-13 AAL684 - Jul 13, 07:35 UTCJul 13, 13:15 UTC5h 40m
2026-07-12 AAL697 - Jul 12, 18:35 UTCJul 13, 00:20 UTC5h 45m
2026-07-12 AAL697 PHX → LIH Jul 12, 18:33 UTCJul 13, 00:30 UTC5h 57m
2026-07-12 AAL1061 - Jul 12, 11:40 UTCJul 12, 15:45 UTC4h 5m
2026-07-12 AAL1221 - Jul 12, 05:10 UTCJul 12, 09:55 UTC4h 45m
2026-07-11 AAL315 - Jul 11, 21:55 UTCJul 12, 02:55 UTC5h 0m
2026-07-11 AAL1558 - Jul 11, 14:35 UTCJul 11, 15:15 UTC40m
2026-07-11 AAL1558 LIM → MIA Jul 11, 14:20 UTCJul 11, 19:38 UTC5h 18m
2026-07-11 AAL1558 LIM → MIA Jul 11, 14:20 UTCJul 11, 19:28 UTC5h 8m
2026-07-11 AAL385 - Jul 11, 07:40 UTCJul 11, 09:20 UTC1h 40m
2026-07-11 AAL385 MIA → LIM Jul 11, 07:36 UTCJul 11, 12:45 UTC5h 9m
2026-07-10 AAL1983 PHX → MIA Jul 10, 20:05 UTCJul 11, 00:00 UTC3h 55m
2026-07-10 AAL2660 - Jul 10, 16:50 UTCJul 10, 17:45 UTC55m
2026-07-10 AAL2660 SNA → PHX Jul 10, 16:48 UTCJul 10, 17:40 UTC52m
2026-07-10 AAL2660 - Jul 10, 14:40 UTCJul 10, 15:45 UTC1h 5m
2026-07-10 AAL692 - Jul 10, 11:10 UTCJul 10, 12:20 UTC1h 10m
2026-07-10 AAL692 - Jul 10, 07:10 UTCJul 10, 07:25 UTC15m
2026-07-10 AAL692 HNL → PHX Jul 10, 07:06 UTCJul 10, 12:18 UTC5h 12m
2026-07-09 AAL675 PHX → HNL Jul 9, 18:15 UTCJul 10, 00:21 UTC6h 6m
2026-07-09 AAL675 - Jul 9, 18:15 UTCJul 10, 00:25 UTC6h 10m
2026-07-09 AAL520 DFW → PHX Jul 9, 14:25 UTCJul 9, 16:21 UTC1h 56m
2026-07-09 AAL520 DFW → PHX Jul 9, 14:30 UTCJul 9, 16:25 UTC1h 55m
2026-07-09 AAL1445 - Jul 9, 08:25 UTCJul 9, 10:55 UTC2h 30m
2026-07-09 AAL1445 LAX → DFW Jul 9, 08:21 UTCJul 9, 10:56 UTC2h 35m
2026-07-02 AAL1499 - Jul 2, 21:15 UTCJul 3, 01:40 UTC4h 25m
2026-07-02 AAL1665 - Jul 2, 15:10 UTCJul 2, 18:55 UTC3h 45m
2026-07-02 AAL2106 PHX → LAS Jul 2, 03:50 UTCJul 2, 04:30 UTC40m
2026-07-01 AAL1073 - Jul 1, 22:40 UTCJul 2, 02:30 UTC3h 50m
2026-07-01 AAL1448 - Jul 1, 19:20 UTCJul 1, 20:45 UTC1h 25m
2026-07-01 AAL1448 BDL → CLT Jul 1, 19:18 UTCJul 1, 20:45 UTC1h 27m
2026-07-01 AAL1448 - Jul 1, 16:20 UTCJul 1, 17:55 UTC1h 35m
2026-07-01 AAL3222 - Jul 1, 13:50 UTCJul 1, 15:10 UTC1h 20m
2026-07-01 AAL1354 - Jul 1, 06:00 UTCJul 1, 10:30 UTC4h 30m
2026-07-01 AAL1354 ANC → ORD Jul 1, 05:58 UTCJul 1, 11:59 UTC6h 1m
2026-06-30 AAL1354 ORD → ANC Jun 30, 22:45 UTCJul 1, 04:35 UTC5h 50m
2026-06-30 AAL2608 - Jun 30, 16:45 UTCJun 30, 20:20 UTC3h 35m
2026-06-30 AAL2608 LAX → ORD Jun 30, 16:44 UTCJun 30, 20:06 UTC3h 22m
2026-06-30 AAL607 - Jun 30, 11:10 UTCJun 30, 14:30 UTC3h 20m
2026-06-30 AAL607 ORD → LAX Jun 30, 11:10 UTCJun 30, 15:04 UTC3h 54m
2026-06-30 AAL435 PHX → ORD Jun 30, 00:35 UTCJun 30, 03:30 UTC2h 56m
2026-06-29 AAL2108 DFW → PHX Jun 29, 20:19 UTCJun 29, 22:19 UTC2h 0m
2026-06-29 AAL2108 DFW → PHX Jun 29, 20:15 UTCJun 29, 22:21 UTC2h 6m
2026-06-29 AAL2719 PHX → DFW Jun 29, 17:05 UTCJun 29, 18:55 UTC1h 50m
2026-06-29 AAL848 STI → PHL Jun 29, 13:19 UTCJun 29, 14:25 UTC1h 5m
2026-06-29 AAL205 - Jun 29, 01:50 UTCJun 29, 02:20 UTC30m
2026-06-29 AAL205 LAX → OGG Jun 29, 01:45 UTCJun 29, 07:05 UTC5h 20m

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?
Yes. Mode-S A57D42 is currently airborne.
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, AAL692, AAL31, AAL162, AAL767.