Apparatus

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sensors Mode-S transponder

AD4390

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N954AN · BOEING 737-800 · operated by AMERICAN AIRLINES INC

Hex
AD4390
Octal
53241620
Decimal
11,355,024
Country
US
Tail
N954AN
Type
B738
No current signal · last broadcast Jul 26, 21:10 UTC
Flights observed
507
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:10 UTC

Last known position

Most recent position reported by Mode-S AD4390.

Country allocation

The ICAO 24-bit address AD4390 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
AAL314 - 5 2026-07-15
AAL2931 - 5 2026-07-02
AAL2352 - 5 2026-07-05
AAL1877 American Airlines 5 2026-06-10
AAL3165 - 4 2026-06-20
AAL2828 - 4 2026-07-05
AAL2643 - 4 2026-04-13
AAL2572 - 4 2026-06-28
AAL2541 - 4 2026-07-08
AAL2456 American Airlines 4 2026-04-14
AAL2217 - 4 2026-07-12
AAL2067 - 4 2026-07-19
AAL1917 American Airlines 4 2026-05-23
AAL928 American Airlines 3 2026-05-02
AAL923 - 3 2026-07-15
AAL635 American Airlines 3 2026-04-18
AAL537 American Airlines 3 2026-05-28
AAL491 - 3 2026-07-04
AAL479 American Airlines 3 2026-04-16
AAL3319 American Airlines 3 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2651 CLT → SFO Jul 26, 20:20 UTCJul 26, 21:10 UTC50m
2026-07-26 AAL2747 MKE → PHX Jul 26, 16:05 UTCJul 26, 18:45 UTC2h 40m
2026-07-26 AAL2747 MKE → PHX Jul 26, 16:02 UTCJul 26, 18:50 UTC2h 48m
2026-07-26 AAL2747 MKE → PHX Jul 26, 12:15 UTCJul 26, 14:55 UTC2h 40m
2026-07-26 AAL2416 CLT → CVG Jul 26, 00:10 UTCJul 26, 02:50 UTC2h 40m
2026-07-25 AAL2416 CLT → CVG Jul 25, 20:35 UTCJul 25, 23:00 UTC2h 25m
2026-07-25 AAL2416 CLT → CVG Jul 25, 20:35 UTCJul 25, 22:57 UTC2h 22m
2026-07-25 AAL2341 ORD → MIA Jul 25, 17:20 UTCJul 25, 18:55 UTC1h 35m
2026-07-25 AAL1236 EWR → DFW Jul 25, 13:50 UTCJul 25, 15:05 UTC1h 15m
2026-07-25 AAL1236 EWR → DFW Jul 25, 13:40 UTCJul 25, 15:30 UTC1h 50m
2026-07-25 AAL2261 STL → DFW Jul 25, 10:40 UTCJul 25, 12:00 UTC1h 20m
2026-07-25 AAL2261 STL → DFW Jul 25, 10:39 UTCJul 25, 11:58 UTC1h 19m
2026-07-25 AAL1594 PHL → IND Jul 25, 01:20 UTCJul 25, 03:55 UTC2h 35m
2026-07-25 AAL1594 PHL → IND Jul 25, 01:18 UTCJul 25, 03:45 UTC2h 27m
2026-07-24 AAL1283 DFW → AUS Jul 24, 19:40 UTCJul 24, 23:05 UTC3h 25m
2026-07-24 AAL2703 MIA → POS Jul 24, 14:50 UTCJul 24, 17:50 UTC3h 0m
2026-07-24 AAL2703 MIA → POS Jul 24, 14:44 UTCJul 24, 18:10 UTC3h 26m
2026-07-24 AAL3227 PHX → SFO Jul 24, 11:07 UTCJul 24, 12:52 UTC1h 45m
2026-07-24 AAL3227 PHX → SFO Jul 24, 01:10 UTCJul 24, 12:50 UTC11h 40m
2026-07-23 AAL2580 PHX → BNA Jul 23, 14:15 UTCJul 23, 21:35 UTC7h 20m
2026-07-23 AAL2308 IND → MIA Jul 23, 10:15 UTCJul 23, 12:30 UTC2h 15m
2026-07-23 AAL2308 IND → MIA Jul 23, 10:11 UTCJul 23, 12:28 UTC2h 17m
2026-07-23 AAL2518 ORD → JFK Jul 23, 01:40 UTCJul 23, 04:00 UTC2h 20m
2026-07-23 AAL2518 ORD → JFK Jul 23, 01:35 UTCJul 23, 03:58 UTC2h 23m
2026-07-22 AAL910 - Jul 22, 22:30 UTCJul 22, 23:00 UTC30m
2026-07-22 AAL910 - Jul 22, 20:40 UTCJul 22, 20:50 UTC10m
2026-07-22 AAL925 PHL → LAX Jul 22, 17:00 UTCJul 22, 19:05 UTC2h 5m
2026-07-22 AAL243 HAV → MIA Jul 22, 14:50 UTCJul 22, 15:20 UTC30m
2026-07-22 AAL243 HAV → MIA Jul 22, 14:33 UTCJul 22, 15:21 UTC48m
2026-07-22 AAL242 MIA → HAV Jul 22, 12:30 UTCJul 22, 13:00 UTC30m
2026-07-21 AAL1931 MIA → JAX Jul 21, 23:45 UTCJul 22, 01:55 UTC2h 10m
2026-07-21 AAL1931 MIA → JAX Jul 21, 20:15 UTCJul 21, 22:25 UTC2h 10m
2026-07-21 AAL3020 PHL → DEN Jul 21, 13:15 UTCJul 21, 15:40 UTC2h 25m
2026-07-20 AAL2755 BOS → MIA Jul 20, 23:00 UTCJul 21, 01:05 UTC2h 5m
2026-07-20 AAL2755 BOS → MIA Jul 20, 22:58 UTCJul 21, 01:14 UTC2h 16m
2026-07-20 AAL1245 LAX → PIT Jul 20, 14:40 UTCJul 20, 20:05 UTC5h 25m
2026-07-20 AAL1047 IND → MIA Jul 20, 10:25 UTCJul 20, 12:40 UTC2h 15m
2026-07-20 AAL2357 DFW → DEN Jul 20, 02:15 UTCJul 20, 04:35 UTC2h 20m
2026-07-20 AAL2357 DFW → DEN Jul 20, 02:12 UTCJul 20, 04:31 UTC2h 19m
2026-07-20 AAL3186 SLC → PHX Jul 20, 00:15 UTCJul 20, 01:10 UTC55m
2026-07-19 AAL2877 - Jul 19, 20:00 UTCJul 19, 23:05 UTC3h 5m
2026-07-19 AAL2067 MCO → ORD Jul 19, 15:50 UTCJul 19, 18:20 UTC2h 30m
2026-07-19 AAL2067 ORD → MCO Jul 19, 12:30 UTCJul 19, 14:35 UTC2h 5m
2026-07-19 AAL1424 DFW → ORD Jul 19, 00:10 UTCJul 19, 02:00 UTC1h 50m
2026-07-19 AAL1424 DFW → ORD Jul 19, 00:07 UTCJul 19, 01:59 UTC1h 52m
2026-07-18 AAL2334 - Jul 18, 20:00 UTCJul 18, 22:30 UTC2h 30m
2026-07-18 AAL2334 PSP → DFW Jul 18, 19:52 UTCJul 18, 22:26 UTC2h 34m
2026-07-18 AAL2334 - Jul 18, 16:10 UTCJul 18, 18:15 UTC2h 5m
2026-07-18 AAL1432 FLL → PHL Jul 18, 02:05 UTCJul 18, 14:20 UTC12h 16m
2026-07-17 AAL1414 DCA → DFW Jul 17, 21:44 UTCJul 18, 00:25 UTC2h 40m

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 N954AN page for operator, model, and routing details .

Mode-S AD4390 frequently asked

What is Mode-S code AD4390?
AD4390 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N954AN.
Where is Mode-S AD4390 registered?
Mode-S code AD4390 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 AD4390 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD4390, octal 53241620, decimal 11,355,024.
What flights does AD4390 operate?
Mode-S AD4390 has broadcast 20 distinct callsigns, including AAL314, AAL2931, AAL2352, AAL1877, AAL3165.