Apparatus

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sensors Mode-S transponder

A4CA66

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N408AN · AIRBUS A-321neo · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A4CA66
Octal
51145146
Decimal
10,799,718
Country
US
Tail
N408AN
Type
A21N
No current signal · last broadcast Jul 26, 02:10 UTC
Flights observed
436
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 02:10 UTC

Last known position

Most recent position reported by Mode-S A4CA66.

Country allocation

The ICAO 24-bit address A4CA66 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
AAL697 American Airlines 10 2026-07-21
AAL675 - 9 2026-07-02
AAL246 American Airlines 9 2026-05-10
AAL1354 - 9 2026-07-13
AAL1981 American Airlines 8 2026-07-23
AAL684 American Airlines 7 2026-07-22
AAL2888 - 7 2026-07-12
AAL2659 - 7 2026-07-19
AAL1313 - 6 2026-07-12
AAL917 - 5 2026-06-24
AAL3161 American Airlines 5 2026-04-30
AAL315 - 5 2026-07-07
AAL2927 - 5 2026-07-03
AAL2608 - 5 2026-07-12
AAL1787 American Airlines 5 2026-05-19
AAL1719 - 5 2026-07-08
AAL1451 American Airlines 5 2026-06-02
AAL988 - 4 2026-06-25
AAL510 - 4 2026-07-06
AAL435 American Airlines 4 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL3242 SMF → LAX Jul 26, 02:00 UTCJul 26, 02:10 UTC10m
2026-07-26 AAL3242 SMF → LAX Jul 26, 00:00 UTCJul 26, 02:10 UTC2h 10m
2026-07-25 AAL3242 SMF → LAX Jul 25, 23:56 UTCJul 26, 01:42 UTC1h 46m
2026-07-25 AAL402 DFW → PHL Jul 25, 19:20 UTCJul 25, 22:10 UTC2h 50m
2026-07-25 AAL402 DFW → PHL Jul 25, 19:19 UTCJul 25, 22:11 UTC2h 52m
2026-07-25 AAL402 DFW → PHL Jul 25, 15:00 UTCJul 25, 17:50 UTC2h 50m
2026-07-25 AAL3002 LAS → MIA Jul 25, 12:20 UTCJul 25, 13:05 UTC45m
2026-07-25 AAL2209 DFW → IAH Jul 25, 02:35 UTCJul 25, 03:13 UTC38m
2026-07-25 AAL2209 DFW → IAH Jul 25, 02:40 UTCJul 25, 03:15 UTC35m
2026-07-24 AAL2994 RSW → ORD Jul 24, 22:15 UTCJul 25, 01:05 UTC2h 50m
2026-07-24 AAL2408 NAS → LGA Jul 24, 15:30 UTCJul 24, 20:30 UTC5h 0m
2026-07-24 AAL2129 MIA → PHL Jul 24, 11:10 UTCJul 24, 13:35 UTC2h 25m
2026-07-24 AAL2205 MIA → TQO Jul 24, 05:30 UTCJul 24, 09:30 UTC4h 0m
2026-07-24 AAL2205 MIA → TQO Jul 24, 05:27 UTCJul 24, 09:27 UTC4h 0m
2026-07-23 AAL2105 MIA → MSY Jul 23, 23:00 UTCJul 24, 02:35 UTC3h 35m
2026-07-23 AAL2105 MIA → MSY Jul 23, 17:30 UTCJul 23, 21:15 UTC3h 45m
2026-07-23 AAL2991 ORD → PHL Jul 23, 10:45 UTCJul 23, 15:50 UTC5h 5m
2026-07-23 AAL1981 SBA → DFW Jul 23, 04:00 UTCJul 23, 09:15 UTC5h 15m
2026-07-23 AAL1981 SBA → DFW Jul 23, 04:05 UTCJul 23, 09:20 UTC5h 15m
2026-07-22 AAL186 CUN → PHX Jul 22, 21:35 UTCJul 23, 01:05 UTC3h 30m
2026-07-22 AAL186 CUN → PHX Jul 22, 21:30 UTCJul 23, 01:04 UTC3h 34m
2026-07-22 AAL515 PHX → CUN Jul 22, 16:10 UTCJul 22, 19:55 UTC3h 45m
2026-07-22 AAL684 PHX → LIH Jul 22, 11:10 UTCJul 22, 12:35 UTC1h 25m
2026-07-22 AAL684 PHX → LIH Jul 22, 07:03 UTCJul 22, 12:34 UTC5h 31m
2026-07-21 AAL697 LIH → PHX Jul 21, 18:05 UTCJul 22, 00:10 UTC6h 5m
2026-07-21 AAL697 LIH → PHX Jul 21, 18:01 UTCJul 22, 00:17 UTC6h 16m
2026-07-21 AAL520 - Jul 21, 14:35 UTCJul 21, 16:30 UTC1h 55m
2026-07-21 AAL1226 - Jul 21, 09:35 UTCJul 21, 12:05 UTC2h 30m
2026-07-21 AAL1226 MIA → DFW Jul 21, 09:33 UTCJul 21, 12:01 UTC2h 28m
2026-07-21 AAL3308 PHL → SJU Jul 21, 00:30 UTCJul 21, 03:05 UTC2h 35m
2026-07-20 AAL407 ORD → BOS Jul 20, 15:20 UTCJul 20, 21:15 UTC5h 55m
2026-07-20 AAL1981 SBA → DFW Jul 20, 02:31 UTCJul 20, 07:34 UTC5h 3m
2026-07-20 AAL1981 SBA → DFW Jul 20, 02:35 UTCJul 20, 07:35 UTC5h 0m
2026-07-19 AAL2659 - Jul 19, 23:35 UTCJul 20, 00:35 UTC1h 0m
2026-07-19 AAL2659 - Jul 19, 21:30 UTCJul 19, 22:15 UTC45m
2026-07-19 AAL646 PHL → MCO Jul 19, 15:40 UTCJul 19, 19:45 UTC4h 5m
2026-07-19 AAL2764 BOS → PHL Jul 19, 12:45 UTCJul 19, 13:40 UTC55m
2026-07-18 AAL366 RDU → LGA Jul 18, 20:46 UTCJul 19, 01:18 UTC4h 32m
2026-07-18 AAL366 RDU → LGA Jul 18, 20:50 UTCJul 19, 01:15 UTC4h 25m
2026-07-18 AAL2660 - Jul 18, 17:00 UTCJul 18, 17:50 UTC50m
2026-07-18 AAL2660 - Jul 18, 14:50 UTCJul 18, 15:45 UTC55m
2026-07-18 AAL1854 DFW → PHX Jul 18, 11:25 UTCJul 18, 13:25 UTC2h 0m
2026-07-18 AAL3099 LAS → DFW Jul 18, 07:30 UTCJul 18, 09:45 UTC2h 15m
2026-07-17 AAL3040 PHL → LAS Jul 17, 20:35 UTCJul 18, 01:10 UTC4h 35m
2026-07-17 AAL3040 PHL → LAS Jul 17, 20:35 UTCJul 18, 01:08 UTC4h 33m
2026-07-17 AAL2955 - Jul 17, 13:50 UTCJul 17, 18:34 UTC4h 45m
2026-07-16 AAL1489 - Jul 16, 20:05 UTCJul 17, 00:45 UTC4h 40m
2026-07-16 AAL1489 PHL → PHL Jul 16, 19:50 UTCJul 16, 19:55 UTC5m
2026-07-16 AAL2161 - Jul 16, 13:15 UTCJul 16, 18:19 UTC5h 5m
2026-07-16 AAL2161 SFO → PHL Jul 16, 13:12 UTCJul 16, 18:15 UTC5h 3m

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 N408AN page for operator, model, and routing details .

Mode-S A4CA66 frequently asked

What is Mode-S code A4CA66?
A4CA66 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N408AN.
Where is Mode-S A4CA66 registered?
Mode-S code A4CA66 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 A4CA66 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 02:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4CA66, octal 51145146, decimal 10,799,718.
What flights does A4CA66 operate?
Mode-S A4CA66 has broadcast 20 distinct callsigns, including AAL697, AAL675, AAL246, AAL1354, AAL1981.