Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A4BF41

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N405AN · AIRBUS A-321neo · operated by BANK OF UTAH TRUSTEE

Hex
A4BF41
Octal
51137501
Decimal
10,796,865
Country
US
Tail
N405AN
Type
A21N
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
461
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A4BF41.

Country allocation

The ICAO 24-bit address A4BF41 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
AAL664 American Airlines 9 2026-05-28
AAL663 - 8 2026-07-17
AAL119 American Airlines 8 2026-07-18
AAL3016 - 7 2026-07-08
AAL2669 - 7 2026-06-24
AAL266 - 6 2026-07-18
AAL1621 - 6 2026-07-15
AAL1333 - 6 2026-06-30
AAL694 American Airlines 5 2026-07-24
AAL3161 American Airlines 5 2026-04-26
AAL2888 American Airlines 5 2026-06-07
AAL271 American Airlines 5 2026-07-22
AAL2542 - 5 2026-06-15
AAL2300 American Airlines 5 2026-06-29
AAL1719 American Airlines 5 2026-06-06
AAL162 American Airlines 5 2026-05-30
AAL1313 American Airlines 5 2026-06-07
AAL988 American Airlines 4 2026-07-25
AAL713 American Airlines 4 2026-04-24
AAL675 American Airlines 4 2026-05-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL757 DFW → MIA Jul 26, 19:45 UTCJul 26, 22:15 UTC2h 30m
2026-07-26 AAL3081 ELP → DFW Jul 26, 15:30 UTCJul 26, 17:55 UTC2h 25m
2026-07-26 AAL3081 ELP → DFW Jul 26, 15:28 UTCJul 26, 17:53 UTC2h 25m
2026-07-25 AAL2912 ORD → XNA Jul 25, 18:00 UTCJul 25, 19:30 UTC1h 30m
2026-07-25 AAL2912 ORD → XNA Jul 25, 17:55 UTCJul 25, 19:29 UTC1h 34m
2026-07-25 AAL840 CLT → DFW Jul 25, 14:10 UTCJul 25, 15:40 UTC1h 30m
2026-07-25 AAL840 CLT → DFW Jul 25, 14:06 UTCJul 25, 15:39 UTC1h 33m
2026-07-25 AAL988 LIM → MIA Jul 25, 11:55 UTCJul 25, 12:15 UTC20m
2026-07-25 AAL988 LIM → MIA Jul 25, 07:25 UTCJul 25, 10:45 UTC3h 20m
2026-07-25 AAL917 MIA → LIM Jul 25, 00:20 UTCJul 25, 05:15 UTC4h 55m
2026-07-24 AAL1184 SJU → ORD Jul 24, 16:10 UTCJul 24, 20:20 UTC4h 10m
2026-07-24 AAL694 CMH → PHL Jul 24, 08:35 UTCJul 24, 14:05 UTC5h 30m
2026-07-24 AAL297 LAX → HNL Jul 24, 01:20 UTCJul 24, 06:35 UTC5h 15m
2026-07-24 AAL297 LAX → HNL Jul 24, 01:15 UTCJul 24, 06:25 UTC5h 10m
2026-07-23 AAL778 SDQ → MIA Jul 23, 18:45 UTCJul 23, 23:25 UTC4h 40m
2026-07-23 AAL2405 ANU → MIA Jul 23, 15:20 UTCJul 23, 17:00 UTC1h 40m
2026-07-23 AAL2405 ANU → MIA Jul 23, 15:19 UTCJul 23, 16:58 UTC1h 39m
2026-07-23 AAL2405 ANU → MIA Jul 23, 12:15 UTCJul 23, 14:10 UTC1h 55m
2026-07-23 AAL1221 PLS → ORD Jul 23, 05:30 UTCJul 23, 10:10 UTC4h 40m
2026-07-23 AAL254 OGG → LAX Jul 23, 03:15 UTCJul 23, 03:55 UTC40m
2026-07-22 AAL271 LAX → OGG Jul 22, 21:25 UTCJul 22, 21:35 UTC10m
2026-07-22 AAL271 LAX → OGG Jul 22, 16:15 UTCJul 22, 16:45 UTC30m
2026-07-22 AAL271 LAX → OGG Jul 22, 16:11 UTCJul 22, 21:26 UTC5h 15m
2026-07-22 AAL1084 - Jul 22, 02:35 UTCJul 22, 05:10 UTC2h 35m
2026-07-22 AAL1084 DFW → DFW Jul 22, 02:20 UTCJul 22, 02:25 UTC5m
2026-07-21 AAL2239 DFW → SFO Jul 21, 21:55 UTCJul 22, 00:40 UTC2h 45m
2026-07-21 AAL2239 DFW → SFO Jul 21, 18:10 UTCJul 21, 20:35 UTC2h 25m
2026-07-21 AAL982 DFW → ATL Jul 21, 12:20 UTCJul 21, 15:40 UTC3h 20m
2026-07-21 AAL2620 DFW → PDX Jul 21, 04:45 UTCJul 21, 07:55 UTC3h 10m
2026-07-19 AAL2994 RSW → ORD Jul 19, 22:20 UTCJul 20, 01:15 UTC2h 55m
2026-07-19 AAL2408 NAS → LGA Jul 19, 16:05 UTCJul 19, 20:45 UTC4h 40m
2026-07-19 AAL1228 MCO → PHL Jul 19, 12:15 UTCJul 19, 14:15 UTC2h 0m
2026-07-19 AAL1118 LAX → MCO Jul 19, 06:10 UTCJul 19, 10:40 UTC4h 30m
2026-07-18 AAL266 - Jul 18, 23:45 UTCJul 19, 04:35 UTC4h 50m
2026-07-18 AAL119 DFW → OGG Jul 18, 16:25 UTCJul 18, 21:35 UTC5h 10m
2026-07-18 AAL119 DFW → OGG Jul 18, 16:21 UTCJul 18, 21:45 UTC5h 24m
2026-07-18 AAL58 - Jul 18, 05:45 UTCJul 18, 06:30 UTC45m
2026-07-18 AAL58 - Jul 18, 01:39 UTCJul 18, 01:50 UTC10m
2026-07-17 AAL663 - Jul 17, 23:39 UTCJul 17, 23:50 UTC10m
2026-07-17 AAL663 PHX → KOA Jul 17, 18:04 UTCJul 17, 23:50 UTC5h 46m
2026-07-17 AAL663 - Jul 17, 18:05 UTCJul 17, 19:20 UTC1h 15m
2026-07-17 AAL694 - Jul 17, 13:25 UTCJul 17, 14:44 UTC1h 20m
2026-07-17 AAL694 - Jul 17, 09:15 UTCJul 17, 09:35 UTC20m
2026-07-17 AAL297 - Jul 17, 02:15 UTCJul 17, 07:25 UTC5h 10m
2026-07-17 AAL297 LAX → HNL Jul 17, 02:11 UTCJul 17, 07:23 UTC5h 12m
2026-07-16 AAL2732 - Jul 16, 21:55 UTCJul 17, 00:25 UTC2h 30m
2026-07-16 AAL2732 DFW → LAX Jul 16, 21:50 UTCJul 17, 00:21 UTC2h 31m
2026-07-16 AAL2607 SLC → DFW Jul 16, 17:49 UTCJul 16, 20:05 UTC2h 15m
2026-07-16 AAL2607 - Jul 16, 13:54 UTCJul 16, 16:09 UTC2h 15m
2026-07-16 AAL1226 - Jul 16, 09:30 UTCJul 16, 12:20 UTC2h 50m

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 N405AN page for operator, model, and routing details .

Mode-S A4BF41 frequently asked

What is Mode-S code A4BF41?
A4BF41 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N405AN.
Where is Mode-S A4BF41 registered?
Mode-S code A4BF41 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 A4BF41 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4BF41, octal 51137501, decimal 10,796,865.
What flights does A4BF41 operate?
Mode-S A4BF41 has broadcast 20 distinct callsigns, including AAL664, AAL663, AAL119, AAL3016, AAL2669.