Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A51D1B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N429AN · AIRBUS A-321neo · operated by BANK OF UTAH TRUSTEE

Hex
A51D1B
Octal
51216433
Decimal
10,820,891
Country
US
Tail
N429AN
Type
A21N
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
441
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A51D1B.

Country allocation

The ICAO 24-bit address A51D1B 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
AAL663 - 8 2026-07-13
AAL58 - 6 2026-07-14
AAL1282 American Airlines 6 2026-04-21
AAL2663 American Airlines 5 2026-07-22
AAL2408 - 5 2026-04-13
AAL1981 - 5 2026-07-07
AAL1653 American Airlines 5 2026-04-28
AAL693 American Airlines 4 2026-06-04
AAL675 American Airlines 4 2026-05-25
AAL664 - 4 2026-07-10
AAL428 - 4 2026-07-13
AAL407 - 4 2026-07-07
AAL395 - 4 2026-06-21
AAL3272 American Airlines 4 2026-04-24
AAL3268 - 4 2026-07-19
AAL3040 American Airlines 4 2026-07-26
AAL2927 - 4 2026-07-06
AAL2045 - 4 2026-07-13
AAL1969 - 4 2026-07-18
AAL1967 American Airlines 4 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL3040 PHL → LAS Jul 26, 20:15 UTCJul 26, 22:45 UTC2h 30m
2026-07-26 AAL2955 SFO → MIA Jul 26, 13:36 UTCJul 26, 18:10 UTC4h 34m
2026-07-26 AAL2955 SFO → MIA Jul 26, 13:40 UTCJul 26, 18:15 UTC4h 35m
2026-07-25 AAL1489 CLT → EWR Jul 25, 20:00 UTCJul 26, 00:45 UTC4h 45m
2026-07-25 AAL2161 BOS → JFK Jul 25, 13:05 UTCJul 25, 17:50 UTC4h 45m
2026-07-25 AAL2161 BOS → JFK Jul 25, 13:04 UTCJul 25, 17:47 UTC4h 43m
2026-07-25 AAL446 DFW → SFO Jul 25, 04:15 UTCJul 25, 07:25 UTC3h 10m
2026-07-24 AAL757 DFW → MIA Jul 24, 22:55 UTCJul 25, 02:10 UTC3h 15m
2026-07-24 AAL757 DFW → MIA Jul 24, 17:30 UTCJul 24, 21:10 UTC3h 40m
2026-07-24 AAL1198 SFO → DFW Jul 24, 12:45 UTCJul 24, 15:55 UTC3h 10m
2026-07-24 AAL1198 SFO → DFW Jul 24, 12:40 UTCJul 24, 15:50 UTC3h 10m
2026-07-24 AAL3295 BOS → CLT Jul 24, 02:35 UTCJul 24, 07:55 UTC5h 20m
2026-07-23 AAL3319 FSD → IAH Jul 23, 19:35 UTCJul 24, 00:10 UTC4h 35m
2026-07-23 AAL3319 FSD → IAH Jul 23, 19:32 UTCJul 24, 00:16 UTC4h 44m
2026-07-23 AAL843 PHL → IND Jul 23, 13:10 UTCJul 23, 18:00 UTC4h 50m
2026-07-23 AAL1545 PWM → DCA Jul 23, 05:10 UTCJul 23, 10:10 UTC5h 0m
2026-07-22 AAL2663 PHL → SFO Jul 22, 22:00 UTCJul 23, 03:25 UTC5h 25m
2026-07-22 AAL1528 MIA → PHL Jul 22, 15:15 UTCJul 22, 19:50 UTC4h 35m
2026-07-22 AAL1528 MIA → PHL Jul 22, 15:14 UTCJul 22, 19:50 UTC4h 36m
2026-07-22 AAL3328 DFW → LAX Jul 22, 00:35 UTCJul 22, 05:10 UTC4h 35m
2026-07-21 AAL3016 - Jul 21, 18:10 UTCJul 21, 22:55 UTC4h 45m
2026-07-21 AAL713 DCA → PHX Jul 21, 11:35 UTCJul 21, 16:15 UTC4h 40m
2026-07-21 AAL918 LIM → MIA Jul 21, 03:35 UTCJul 21, 08:30 UTC4h 55m
2026-07-21 AAL918 LIM → MIA Jul 21, 03:17 UTCJul 21, 08:29 UTC5h 12m
2026-07-20 AAL1307 - Jul 20, 21:40 UTCJul 21, 01:00 UTC3h 19m
2026-07-20 AAL1307 - Jul 20, 20:10 UTCJul 20, 20:25 UTC15m
2026-07-20 AAL1558 - Jul 20, 12:15 UTCJul 20, 16:00 UTC3h 45m
2026-07-20 AAL1558 LIM → MIA Jul 20, 11:57 UTCJul 20, 17:32 UTC5h 35m
2026-07-20 AAL385 BOS → DFW Jul 20, 03:45 UTCJul 20, 08:55 UTC5h 10m
2026-07-19 AAL1565 BOS → MIA Jul 19, 20:00 UTCJul 19, 22:55 UTC2h 55m
2026-07-19 AAL1565 - Jul 19, 15:25 UTCJul 19, 18:10 UTC2h 45m
2026-07-19 AAL2593 MSP → DFW Jul 19, 13:00 UTCJul 19, 13:40 UTC40m
2026-07-19 AAL2593 MSP → DFW Jul 19, 12:58 UTCJul 19, 13:37 UTC39m
2026-07-19 AAL3268 PHL → MCO Jul 19, 01:50 UTCJul 19, 03:40 UTC1h 50m
2026-07-19 AAL3268 PHL → MCO Jul 19, 01:49 UTCJul 19, 03:40 UTC1h 51m
2026-07-19 AAL3268 - Jul 19, 00:40 UTCJul 19, 00:45 UTC5m
2026-07-18 AAL779 LAS → PHL Jul 18, 17:45 UTCJul 18, 22:20 UTC4h 35m
2026-07-18 AAL1969 DFW → LAS Jul 18, 12:30 UTCJul 18, 14:40 UTC2h 10m
2026-07-18 AAL3136 - Jul 18, 07:10 UTCJul 18, 09:45 UTC2h 35m
2026-07-18 AAL3136 LAX → DFW Jul 18, 07:05 UTCJul 18, 09:46 UTC2h 41m
2026-07-17 AAL1499 - Jul 17, 21:10 UTCJul 18, 01:20 UTC4h 10m
2026-07-17 AAL1665 LAS → CLT Jul 17, 15:37 UTCJul 17, 19:32 UTC3h 55m
2026-07-17 AAL1665 - Jul 17, 15:40 UTCJul 17, 19:35 UTC3h 55m
2026-07-16 AAL3005 - Jul 16, 22:45 UTCJul 17, 03:10 UTC4h 25m
2026-07-16 AAL779 LAS → PHL Jul 16, 16:40 UTCJul 16, 21:05 UTC4h 25m
2026-07-16 AAL1969 DFW → LAS Jul 16, 12:44 UTCJul 16, 15:10 UTC2h 25m
2026-07-16 AAL1818 PHX → DFW Jul 16, 07:55 UTCJul 16, 09:50 UTC1h 55m
2026-07-16 AAL2319 - Jul 16, 04:15 UTCJul 16, 06:10 UTC1h 55m
2026-07-16 AAL2319 DFW → PHX Jul 16, 04:11 UTCJul 16, 06:05 UTC1h 54m
2026-07-15 AAL2994 - Jul 15, 22:10 UTCJul 16, 00:50 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 N429AN page for operator, model, and routing details .

Mode-S A51D1B frequently asked

What is Mode-S code A51D1B?
A51D1B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N429AN.
Where is Mode-S A51D1B registered?
Mode-S code A51D1B 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 A51D1B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A51D1B, octal 51216433, decimal 10,820,891.
What flights does A51D1B operate?
Mode-S A51D1B has broadcast 20 distinct callsigns, including AAL663, AAL58, AAL1282, AAL2663, AAL2408.