sensors Mode-S transponder

A540E2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N438AM · BOEING 787-9 Dreamliner · operated by BC2 43862 LLC

Hex
A540E2
Octal
51240342
Decimal
10,830,050
Country
US
Tail
N438AM
Type
B789
No current signal · last broadcast 2h ago
Flights observed
117
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A540E2.

Country allocation

The ICAO 24-bit address A540E2 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
AMX090 Aeroméxico 16 2026-05-20
AMX034 Aeroméxico 14 2026-05-13
AMX091 Aeroméxico 8 2026-05-21
AMX007 - 8 2026-05-07
AMX006 - 8 2026-05-26
AMX008 - 7 2026-05-07
AMX005 - 6 2026-05-25
AMX973 - 5 2026-05-16
AMX058 Aeroméxico 4 2026-05-23
AMX057 Aeroméxico 4 2026-05-24
AMX647 Aeroméxico 3 2026-05-29
AMX646 Aeroméxico 3 2026-05-29
AMX409 Aeroméxico 3 2026-05-27
AMX408 Aeroméxico 3 2026-05-27
AMX045 Aeroméxico 3 2026-05-15
AMX044 Aeroméxico 3 2026-05-14
AMX035 Aeroméxico 3 2026-05-14
AMX026 Aeroméxico 3 2026-05-28
AMX025 Aeroméxico 3 2026-05-28
AMX022 Aeroméxico 2 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 AMX647 LAX → MEX May 29, 22:15 UTCMay 29, 22:25 UTC10m
2026-05-29 AMX647 LAX → MEX May 29, 19:30 UTCMay 29, 20:20 UTC50m
2026-05-29 AMX646 MEX → LAX May 29, 16:15 UTCMay 29, 17:30 UTC1h 15m
2026-05-29 AMX646 MEX → LAX May 29, 13:55 UTCMay 29, 14:05 UTC10m
2026-05-28 AMX026 AMS → MEX May 28, 20:15 UTCMay 29, 06:55 UTC10h 40m
2026-05-28 AMX025 MEX → AMS May 28, 05:05 UTCMay 28, 15:10 UTC10h 5m
2026-05-27 AMX409 JFK → MEX May 27, 20:50 UTCMay 28, 01:45 UTC4h 55m
2026-05-27 AMX408 MEX → JFK May 27, 13:40 UTCMay 27, 17:50 UTC4h 10m
2026-05-26 AMX006 - May 26, 13:19 UTCMay 27, 00:39 UTC11h 20m
2026-05-25 AMX005 - May 25, 23:40 UTCMay 26, 09:55 UTC10h 15m
2026-05-25 AMX002 MAD → MEX May 25, 09:10 UTCMay 25, 20:30 UTC11h 20m
2026-05-24 AMX027 MEX → MAD May 24, 17:00 UTCMay 25, 03:10 UTC10h 10m
2026-05-24 AMX057 NRT → MEX May 24, 12:10 UTCMay 24, 12:20 UTC10m
2026-05-24 AMX057 NRT → MEX May 24, 00:50 UTCMay 24, 10:20 UTC9h 30m
2026-05-23 AMX058 MTY → NRT May 23, 08:10 UTCMay 23, 21:35 UTC13h 25m
2026-05-23 AMX058 MTY → NRT May 23, 05:20 UTCMay 23, 06:25 UTC1h 5m
2026-05-22 AMX038 BCN → MEX May 22, 14:15 UTCMay 23, 02:15 UTC12h 0m
2026-05-21 AMX037 MEX → BCN May 21, 23:55 UTCMay 22, 10:30 UTC10h 35m
2026-05-21 AMX091 ICN → MEX May 21, 15:35 UTCMay 21, 15:45 UTC10m
2026-05-21 AMX091 ICN → MEX May 21, 03:00 UTCMay 21, 14:05 UTC11h 5m
2026-05-20 AMX090 MTY → ICN May 20, 06:20 UTCMay 20, 21:10 UTC14h 50m
2026-05-20 AMX090 MTY → ICN May 20, 04:20 UTCMay 20, 04:50 UTC31m
2026-05-20 AMX090 MTY → ICN May 20, 03:20 UTCMay 20, 03:30 UTC10m
2026-05-19 AMX091 ICN → MEX May 19, 16:15 UTCMay 19, 16:25 UTC10m
2026-05-19 AMX091 ICN → MEX May 19, 03:00 UTCMay 19, 14:35 UTC11h 35m
2026-05-18 AMX090 MTY → ICN May 18, 06:35 UTCMay 18, 20:40 UTC14h 4m
2026-05-18 AMX090 MTY → ICN May 18, 03:30 UTCMay 18, 04:40 UTC1h 10m
2026-05-16 AMX022 MAD → MEX May 16, 21:50 UTCMay 17, 09:00 UTC11h 10m
2026-05-16 AMX021 MEX → MAD May 16, 04:15 UTCMay 16, 14:01 UTC9h 46m
2026-05-16 AMX973 - May 16, 00:55 UTCMay 16, 01:05 UTC10m
2026-05-15 AMX973 - May 15, 23:55 UTCMay 16, 00:25 UTC30m
2026-05-15 AMX045 CDG → MTY May 15, 10:15 UTCMay 15, 21:05 UTC10h 49m
2026-05-14 AMX044 MTY → CDG May 14, 21:20 UTCMay 15, 06:55 UTC9h 35m
2026-05-14 AMX035 MAD → MTY May 14, 07:20 UTCMay 14, 17:45 UTC10h 25m
2026-05-13 AMX034 MEX → MTY May 13, 16:55 UTCMay 14, 02:30 UTC9h 35m
2026-05-13 AMX034 MEX → MTY May 13, 13:15 UTCMay 13, 14:20 UTC1h 5m
2026-05-12 AMX973 MTY → MEX May 12, 23:55 UTCMay 13, 01:00 UTC1h 5m
2026-05-12 AMX045 CDG → MTY May 12, 10:15 UTCMay 12, 21:15 UTC11h 0m
2026-05-11 AMX044 MTY → CDG May 11, 21:15 UTCMay 12, 06:30 UTC9h 15m
2026-05-11 AMX035 MAD → MTY May 11, 07:30 UTCMay 11, 18:10 UTC10h 40m
2026-05-10 AMX034 MEX → MTY May 10, 18:20 UTCMay 11, 04:05 UTC9h 45m
2026-05-10 AMX034 MEX → MTY May 10, 13:35 UTCMay 10, 14:34 UTC1h 0m
2026-05-09 AMX022 MAD → MEX May 9, 22:05 UTCMay 10, 09:10 UTC11h 5m
2026-05-09 AMX021 MEX → MAD May 9, 05:15 UTCMay 9, 15:20 UTC10h 5m
2026-05-08 AMX647 LAX → MEX May 8, 19:35 UTCMay 9, 01:40 UTC6h 5m
2026-05-08 AMX646 MEX → LAX May 8, 13:55 UTCMay 8, 17:10 UTC3h 15m
2026-05-07 AMX008 - May 7, 21:45 UTCMay 8, 08:59 UTC11h 15m
2026-05-07 AMX007 - May 7, 05:05 UTCMay 7, 14:50 UTC9h 45m
2026-05-05 AMX409 JFK → MEX May 5, 20:45 UTCMay 6, 01:10 UTC4h 25m
2026-05-05 AMX408 MEX → JFK May 5, 13:40 UTCMay 5, 17:45 UTC4h 5m

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 N438AM page for operator, model, and routing details .

Mode-S A540E2 frequently asked

What is Mode-S code A540E2?
A540E2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N438AM.
Where is Mode-S A540E2 registered?
Mode-S code A540E2 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 A540E2 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A540E2, octal 51240342, decimal 10,830,050.
What flights does A540E2 operate?
Mode-S A540E2 has broadcast 20 distinct callsigns, including AMX090, AMX034, AMX091, AMX007, AMX006.