Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A506D1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N423AN · AIRBUS A-321neo · operated by BANK OF UTAH TRUSTEE

Hex
A506D1
Octal
51203321
Decimal
10,815,185
Country
US
Tail
N423AN
Type
A21N
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
478
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A506D1.

Country allocation

The ICAO 24-bit address A506D1 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
AAL693 American Airlines 9 2026-07-26
AAL663 - 9 2026-07-07
AAL58 - 8 2026-07-08
AAL988 American Airlines 6 2026-07-22
AAL2820 - 6 2026-07-01
AAL917 American Airlines 5 2026-07-22
AAL664 - 5 2026-06-20
AAL428 - 5 2026-07-07
AAL2923 - 5 2026-07-19
AAL2669 American Airlines 5 2026-07-23
AAL2659 - 5 2026-07-15
AAL2405 - 5 2026-07-11
AAL1703 - 5 2026-06-19
AAL164 - 5 2026-07-10
AAL1558 - 5 2026-07-17
AAL1428 American Airlines 5 2026-05-06
AAL1282 American Airlines 5 2026-05-20
AAL667 - 4 2026-07-20
AAL535 American Airlines 4 2026-05-03
AAL435 American Airlines 4 2026-06-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL693 PHL → CLT Jul 26, 16:00 UTCJul 26, 22:00 UTC6h 0m
2026-07-26 AAL1022 PHL → PWM Jul 26, 05:05 UTCJul 26, 05:45 UTC40m
2026-07-26 AAL1022 PHL → PWM Jul 26, 02:45 UTCJul 26, 03:45 UTC1h 0m
2026-07-25 AAL2927 DFW → TUS Jul 25, 20:45 UTCJul 26, 01:20 UTC4h 35m
2026-07-25 AAL2927 DFW → TUS Jul 25, 14:45 UTCJul 25, 18:55 UTC4h 10m
2026-07-25 AAL692 PHX → HNL Jul 25, 11:20 UTCJul 25, 12:50 UTC1h 30m
2026-07-25 AAL692 PHX → HNL Jul 25, 07:25 UTCJul 25, 07:40 UTC15m
2026-07-24 AAL675 HNL → PHX Jul 24, 18:10 UTCJul 25, 00:25 UTC6h 15m
2026-07-24 AAL520 CLE → PHL Jul 24, 14:20 UTCJul 24, 16:15 UTC1h 55m
2026-07-24 AAL1226 MIA → DFW Jul 24, 09:40 UTCJul 24, 12:10 UTC2h 30m
2026-07-24 AAL1824 MSY → PHL Jul 24, 01:45 UTCJul 24, 04:15 UTC2h 30m
2026-07-23 AAL2669 PHX → EWR Jul 23, 21:30 UTCJul 24, 00:10 UTC2h 40m
2026-07-23 AAL2669 PHX → EWR Jul 23, 21:26 UTCJul 24, 00:08 UTC2h 42m
2026-07-23 AAL2669 PHX → EWR Jul 23, 16:10 UTCJul 23, 18:40 UTC2h 30m
2026-07-23 AAL1818 CLT → PHL Jul 23, 07:55 UTCJul 23, 09:50 UTC1h 55m
2026-07-22 AAL2982 PWM → DCA Jul 22, 22:30 UTCJul 23, 02:35 UTC4h 5m
2026-07-22 AAL1589 DFW → AUS Jul 22, 17:50 UTCJul 22, 20:55 UTC3h 5m
2026-07-22 AAL1589 DFW → AUS Jul 22, 13:30 UTCJul 22, 16:20 UTC2h 50m
2026-07-22 AAL988 LIM → MIA Jul 22, 11:10 UTCJul 22, 11:25 UTC15m
2026-07-22 AAL917 MIA → LIM Jul 22, 00:35 UTCJul 22, 04:00 UTC3h 25m
2026-07-21 AAL917 MIA → LIM Jul 21, 23:05 UTCJul 21, 23:25 UTC20m
2026-07-21 AAL3234 SEA → ORD Jul 21, 16:45 UTCJul 21, 20:45 UTC4h 0m
2026-07-21 AAL422 DCA → MIA Jul 21, 12:45 UTCJul 21, 15:00 UTC2h 15m
2026-07-20 AAL667 MIA → DCA Jul 20, 22:40 UTCJul 21, 00:50 UTC2h 10m
2026-07-20 AAL667 MIA → DCA Jul 20, 22:40 UTCJul 21, 00:48 UTC2h 8m
2026-07-20 AAL1332 DEN → PHX Jul 20, 19:10 UTCJul 20, 20:23 UTC1h 13m
2026-07-20 AAL1332 DEN → PHX Jul 20, 16:35 UTCJul 20, 20:25 UTC3h 50m
2026-07-20 AAL2184 PHL → MIA Jul 20, 12:35 UTCJul 20, 14:55 UTC2h 20m
2026-07-20 AAL1333 SDF → MIA Jul 20, 05:40 UTCJul 20, 10:25 UTC4h 45m
2026-07-19 AAL1333 SDF → MIA Jul 19, 22:50 UTCJul 20, 03:35 UTC4h 45m
2026-07-19 AAL1333 SDF → MIA Jul 19, 22:35 UTCJul 19, 22:40 UTC5m
2026-07-19 AAL1333 SDF → MIA Jul 19, 22:20 UTCJul 19, 22:25 UTC5m
2026-07-19 AAL2300 PHX → PHL Jul 19, 16:15 UTCJul 19, 20:30 UTC4h 15m
2026-07-19 AAL2923 - Jul 19, 02:10 UTCJul 19, 04:45 UTC2h 35m
2026-07-19 AAL2923 - Jul 19, 01:10 UTCJul 19, 02:05 UTC55m
2026-07-18 AAL2923 - Jul 18, 19:30 UTCJul 18, 23:10 UTC3h 40m
2026-07-18 AAL1986 - Jul 18, 14:05 UTCJul 18, 17:50 UTC3h 45m
2026-07-18 AAL2187 - Jul 18, 10:50 UTCJul 18, 12:05 UTC1h 15m
2026-07-18 AAL2187 - Jul 18, 10:30 UTCJul 18, 10:45 UTC15m
2026-07-18 AAL2187 MIA → CLT Jul 18, 10:30 UTCJul 18, 12:10 UTC1h 40m
2026-07-18 AAL1174 DFW → GDL Jul 18, 03:36 UTCJul 18, 05:56 UTC2h 20m
2026-07-18 AAL1174 DFW → GDL Jul 18, 03:40 UTCJul 18, 06:00 UTC2h 20m
2026-07-17 AAL642 EWR → ORD Jul 17, 23:45 UTCJul 18, 02:14 UTC2h 30m
2026-07-17 AAL642 EWR → ORD Jul 17, 23:44 UTCJul 18, 02:15 UTC2h 31m
2026-07-17 AAL1558 - Jul 17, 12:00 UTCJul 17, 12:45 UTC45m
2026-07-17 AAL1558 LIM → MIA Jul 17, 11:44 UTCJul 17, 17:03 UTC5h 19m
2026-07-17 AAL1558 LIM → MIA Jul 17, 11:44 UTCJul 17, 16:54 UTC5h 10m
2026-07-17 AAL385 - Jul 17, 03:50 UTCJul 17, 08:35 UTC4h 45m
2026-07-16 AAL3308 DFW → MIA Jul 16, 23:45 UTCJul 17, 02:05 UTC2h 20m
2026-07-16 AAL3308 - Jul 16, 23:49 UTCJul 17, 02:05 UTC2h 15m

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 N423AN page for operator, model, and routing details .

Mode-S A506D1 frequently asked

What is Mode-S code A506D1?
A506D1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N423AN.
Where is Mode-S A506D1 registered?
Mode-S code A506D1 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 A506D1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A506D1, octal 51203321, decimal 10,815,185.
What flights does A506D1 operate?
Mode-S A506D1 has broadcast 20 distinct callsigns, including AAL693, AAL663, AAL58, AAL988, AAL2820.