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
- Flights observed
- 117
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 2h ago
Last known position
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
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-29 | AMX647 | LAX → MEX | May 29, 22:15 UTC | May 29, 22:25 UTC | 10m |
| 2026-05-29 | AMX647 | LAX → MEX | May 29, 19:30 UTC | May 29, 20:20 UTC | 50m |
| 2026-05-29 | AMX646 | MEX → LAX | May 29, 16:15 UTC | May 29, 17:30 UTC | 1h 15m |
| 2026-05-29 | AMX646 | MEX → LAX | May 29, 13:55 UTC | May 29, 14:05 UTC | 10m |
| 2026-05-28 | AMX026 | AMS → MEX | May 28, 20:15 UTC | May 29, 06:55 UTC | 10h 40m |
| 2026-05-28 | AMX025 | MEX → AMS | May 28, 05:05 UTC | May 28, 15:10 UTC | 10h 5m |
| 2026-05-27 | AMX409 | JFK → MEX | May 27, 20:50 UTC | May 28, 01:45 UTC | 4h 55m |
| 2026-05-27 | AMX408 | MEX → JFK | May 27, 13:40 UTC | May 27, 17:50 UTC | 4h 10m |
| 2026-05-26 | AMX006 | - | May 26, 13:19 UTC | May 27, 00:39 UTC | 11h 20m |
| 2026-05-25 | AMX005 | - | May 25, 23:40 UTC | May 26, 09:55 UTC | 10h 15m |
| 2026-05-25 | AMX002 | MAD → MEX | May 25, 09:10 UTC | May 25, 20:30 UTC | 11h 20m |
| 2026-05-24 | AMX027 | MEX → MAD | May 24, 17:00 UTC | May 25, 03:10 UTC | 10h 10m |
| 2026-05-24 | AMX057 | NRT → MEX | May 24, 12:10 UTC | May 24, 12:20 UTC | 10m |
| 2026-05-24 | AMX057 | NRT → MEX | May 24, 00:50 UTC | May 24, 10:20 UTC | 9h 30m |
| 2026-05-23 | AMX058 | MTY → NRT | May 23, 08:10 UTC | May 23, 21:35 UTC | 13h 25m |
| 2026-05-23 | AMX058 | MTY → NRT | May 23, 05:20 UTC | May 23, 06:25 UTC | 1h 5m |
| 2026-05-22 | AMX038 | BCN → MEX | May 22, 14:15 UTC | May 23, 02:15 UTC | 12h 0m |
| 2026-05-21 | AMX037 | MEX → BCN | May 21, 23:55 UTC | May 22, 10:30 UTC | 10h 35m |
| 2026-05-21 | AMX091 | ICN → MEX | May 21, 15:35 UTC | May 21, 15:45 UTC | 10m |
| 2026-05-21 | AMX091 | ICN → MEX | May 21, 03:00 UTC | May 21, 14:05 UTC | 11h 5m |
| 2026-05-20 | AMX090 | MTY → ICN | May 20, 06:20 UTC | May 20, 21:10 UTC | 14h 50m |
| 2026-05-20 | AMX090 | MTY → ICN | May 20, 04:20 UTC | May 20, 04:50 UTC | 31m |
| 2026-05-20 | AMX090 | MTY → ICN | May 20, 03:20 UTC | May 20, 03:30 UTC | 10m |
| 2026-05-19 | AMX091 | ICN → MEX | May 19, 16:15 UTC | May 19, 16:25 UTC | 10m |
| 2026-05-19 | AMX091 | ICN → MEX | May 19, 03:00 UTC | May 19, 14:35 UTC | 11h 35m |
| 2026-05-18 | AMX090 | MTY → ICN | May 18, 06:35 UTC | May 18, 20:40 UTC | 14h 4m |
| 2026-05-18 | AMX090 | MTY → ICN | May 18, 03:30 UTC | May 18, 04:40 UTC | 1h 10m |
| 2026-05-16 | AMX022 | MAD → MEX | May 16, 21:50 UTC | May 17, 09:00 UTC | 11h 10m |
| 2026-05-16 | AMX021 | MEX → MAD | May 16, 04:15 UTC | May 16, 14:01 UTC | 9h 46m |
| 2026-05-16 | AMX973 | - | May 16, 00:55 UTC | May 16, 01:05 UTC | 10m |
| 2026-05-15 | AMX973 | - | May 15, 23:55 UTC | May 16, 00:25 UTC | 30m |
| 2026-05-15 | AMX045 | CDG → MTY | May 15, 10:15 UTC | May 15, 21:05 UTC | 10h 49m |
| 2026-05-14 | AMX044 | MTY → CDG | May 14, 21:20 UTC | May 15, 06:55 UTC | 9h 35m |
| 2026-05-14 | AMX035 | MAD → MTY | May 14, 07:20 UTC | May 14, 17:45 UTC | 10h 25m |
| 2026-05-13 | AMX034 | MEX → MTY | May 13, 16:55 UTC | May 14, 02:30 UTC | 9h 35m |
| 2026-05-13 | AMX034 | MEX → MTY | May 13, 13:15 UTC | May 13, 14:20 UTC | 1h 5m |
| 2026-05-12 | AMX973 | MTY → MEX | May 12, 23:55 UTC | May 13, 01:00 UTC | 1h 5m |
| 2026-05-12 | AMX045 | CDG → MTY | May 12, 10:15 UTC | May 12, 21:15 UTC | 11h 0m |
| 2026-05-11 | AMX044 | MTY → CDG | May 11, 21:15 UTC | May 12, 06:30 UTC | 9h 15m |
| 2026-05-11 | AMX035 | MAD → MTY | May 11, 07:30 UTC | May 11, 18:10 UTC | 10h 40m |
| 2026-05-10 | AMX034 | MEX → MTY | May 10, 18:20 UTC | May 11, 04:05 UTC | 9h 45m |
| 2026-05-10 | AMX034 | MEX → MTY | May 10, 13:35 UTC | May 10, 14:34 UTC | 1h 0m |
| 2026-05-09 | AMX022 | MAD → MEX | May 9, 22:05 UTC | May 10, 09:10 UTC | 11h 5m |
| 2026-05-09 | AMX021 | MEX → MAD | May 9, 05:15 UTC | May 9, 15:20 UTC | 10h 5m |
| 2026-05-08 | AMX647 | LAX → MEX | May 8, 19:35 UTC | May 9, 01:40 UTC | 6h 5m |
| 2026-05-08 | AMX646 | MEX → LAX | May 8, 13:55 UTC | May 8, 17:10 UTC | 3h 15m |
| 2026-05-07 | AMX008 | - | May 7, 21:45 UTC | May 8, 08:59 UTC | 11h 15m |
| 2026-05-07 | AMX007 | - | May 7, 05:05 UTC | May 7, 14:50 UTC | 9h 45m |
| 2026-05-05 | AMX409 | JFK → MEX | May 5, 20:45 UTC | May 6, 01:10 UTC | 4h 25m |
| 2026-05-05 | AMX408 | MEX → JFK | May 5, 13:40 UTC | May 5, 17:45 UTC | 4h 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 .