Apparatus

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sensors Mode-S transponder

A9FA04

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N742AM · BOEING 787-9 Dreamliner · operated by UMB BANK NA TRUSTEE

Hex
A9FA04
Octal
52375004
Decimal
11,139,588
Country
US
Tail
N742AM
Type
B789
No current signal · last broadcast 2h ago
Flights observed
198
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A9FA04.

Country allocation

The ICAO 24-bit address A9FA04 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
AMX058 - 16 2026-07-11
AMX057 - 13 2026-07-12
AMX039 Aeroméxico 12 2026-06-18
AMX036 Aeroméxico 11 2026-06-19
AMX044 - 10 2026-07-13
AMX035 - 10 2026-07-13
AMX045 - 9 2026-07-10
AMX973 - 7 2026-07-10
AMX647 - 7 2026-06-30
AMX409 - 7 2026-06-26
AMX408 - 7 2026-06-26
AMX002 - 7 2026-07-03
AMX090 - 6 2026-06-16
AMX034 Aeroméxico 6 2026-07-08
AMX027 - 6 2026-07-12
AMX022 - 6 2026-07-07
AMX007 - 6 2026-06-24
AMX646 - 5 2026-06-30
AMX021 - 5 2026-07-07
AMX001 - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AMX044 - Jul 13, 21:30 UTCJul 14, 02:25 UTC4h 55m
2026-07-13 AMX035 - Jul 13, 07:20 UTCJul 13, 17:30 UTC10h 10m
2026-07-12 AMX027 - Jul 12, 16:30 UTCJul 13, 03:01 UTC10h 30m
2026-07-12 AMX057 - Jul 12, 13:30 UTCJul 12, 13:40 UTC10m
2026-07-12 AMX057 - Jul 12, 00:55 UTCJul 12, 11:50 UTC10h 55m
2026-07-11 AMX058 MTY → NRT Jul 11, 08:10 UTCJul 11, 21:15 UTC13h 5m
2026-07-11 AMX058 - Jul 11, 04:30 UTCJul 11, 05:40 UTC1h 10m
2026-07-10 AMX973 MTY → MEX Jul 10, 23:40 UTCJul 11, 01:10 UTC1h 30m
2026-07-10 AMX045 CDG → MTY Jul 10, 10:25 UTCJul 10, 21:00 UTC10h 35m
2026-07-09 AMX044 - Jul 9, 21:50 UTCJul 10, 07:25 UTC9h 35m
2026-07-09 AMX035 MAD → MTY Jul 9, 07:30 UTCJul 9, 18:00 UTC10h 30m
2026-07-08 AMX034 MEX → MTY Jul 8, 17:05 UTCJul 9, 02:50 UTC9h 45m
2026-07-08 AMX034 MEX → MTY Jul 8, 13:30 UTCJul 8, 14:40 UTC1h 10m
2026-07-07 AMX022 - Jul 7, 22:15 UTCJul 8, 08:55 UTC10h 40m
2026-07-07 AMX021 - Jul 7, 04:00 UTCJul 7, 14:20 UTC10h 20m
2026-07-05 AMX026 - Jul 5, 20:25 UTCJul 6, 07:30 UTC11h 5m
2026-07-05 AMX025 - Jul 5, 04:55 UTCJul 5, 14:55 UTC10h 0m
2026-07-04 AMX038 BCN → MEX Jul 4, 13:05 UTCJul 5, 00:10 UTC11h 5m
2026-07-03 AMX037 - Jul 3, 23:30 UTCJul 4, 10:05 UTC10h 35m
2026-07-03 AMX002 - Jul 3, 09:05 UTCJul 3, 19:35 UTC10h 30m
2026-07-02 AMX027 - Jul 2, 16:35 UTCJul 3, 02:40 UTC10h 5m
2026-07-02 AMX057 - Jul 2, 00:50 UTCJul 2, 10:45 UTC9h 55m
2026-07-01 AMX058 MTY → NRT Jul 1, 08:00 UTCJul 1, 21:10 UTC13h 10m
2026-07-01 AMX058 - Jul 1, 04:30 UTCJul 1, 05:40 UTC1h 10m
2026-06-30 AMX647 LAX → MEX Jun 30, 21:30 UTCJul 1, 00:30 UTC3h 0m
2026-06-30 AMX646 - Jun 30, 14:35 UTCJun 30, 18:05 UTC3h 30m
2026-06-29 AMX071 FCO → MEX Jun 29, 21:34 UTCJun 30, 09:35 UTC12h 0m
2026-06-29 AMX070 - Jun 29, 02:30 UTCJun 29, 13:34 UTC11h 5m
2026-06-28 AMX9475 - Jun 28, 00:55 UTCJun 28, 11:14 UTC10h 20m
2026-06-27 AMX058 MTY → NRT Jun 27, 07:55 UTCJun 27, 21:04 UTC13h 10m
2026-06-27 AMX058 - Jun 27, 04:49 UTCJun 27, 05:49 UTC1h 0m
2026-06-26 AMX409 - Jun 26, 20:44 UTCJun 27, 01:09 UTC4h 25m
2026-06-26 AMX408 MEX → JFK Jun 26, 13:55 UTCJun 26, 18:20 UTC4h 25m
2026-06-25 AMX409 - Jun 25, 21:05 UTCJun 26, 01:15 UTC4h 10m
2026-06-25 AMX408 - Jun 25, 13:50 UTCJun 25, 17:49 UTC4h 0m
2026-06-24 AMX008 - Jun 24, 21:54 UTCJun 25, 08:34 UTC10h 40m
2026-06-24 AMX007 - Jun 24, 06:35 UTCJun 24, 16:05 UTC9h 30m
2026-06-23 AMX409 - Jun 23, 21:39 UTCJun 24, 01:55 UTC4h 15m
2026-06-23 AMX408 - Jun 23, 13:50 UTCJun 23, 17:54 UTC4h 5m
2026-06-22 AMX022 - Jun 22, 21:59 UTCJun 23, 08:45 UTC10h 45m
2026-06-22 AMX021 - Jun 22, 04:09 UTCJun 22, 14:05 UTC9h 55m
2026-06-21 AMX973 - Jun 21, 23:40 UTCJun 22, 01:19 UTC1h 40m
2026-06-21 AMX045 - Jun 21, 10:19 UTCJun 21, 21:24 UTC11h 5m
2026-06-20 AMX044 - Jun 20, 21:25 UTCJun 21, 06:35 UTC9h 10m
2026-06-20 AMX035 MAD → MTY Jun 20, 07:29 UTCJun 20, 17:59 UTC10h 30m
2026-06-19 AMX036 GDL → MAD Jun 19, 17:09 UTCJun 20, 02:44 UTC9h 35m
2026-06-19 AMX036 GDL → MAD Jun 19, 01:34 UTCJun 19, 19:25 UTC17h 50m
2026-06-18 AMX039 MAD → GDL Jun 18, 23:40 UTCJun 19, 19:25 UTC19h 44m
2026-06-18 AMX039 MAD → GDL Jun 18, 15:25 UTCJun 19, 02:19 UTC10h 54m
2026-06-18 AMX001 - Jun 18, 08:55 UTCJun 18, 10:00 UTC1h 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 N742AM page for operator, model, and routing details .

Mode-S A9FA04 frequently asked

What is Mode-S code A9FA04?
A9FA04 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N742AM.
Where is Mode-S A9FA04 registered?
Mode-S code A9FA04 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 A9FA04 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 A9FA04, octal 52375004, decimal 11,139,588.
What flights does A9FA04 operate?
Mode-S A9FA04 has broadcast 20 distinct callsigns, including AMX058, AMX057, AMX039, AMX036, AMX044.