Apparatus

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sensors Mode-S transponder

AD5623

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N959AN · BOEING 737-800 · operated by AMERICAN AIRLINES INC

Hex
AD5623
Octal
53253043
Decimal
11,359,779
Country
US
Tail
N959AN
Type
B738
No current signal · last broadcast 6h ago
Flights observed
476
Distinct callsigns
20
Country
US
Last broadcast
6h ago

Last known position

Most recent position reported by Mode-S AD5623.

Country allocation

The ICAO 24-bit address AD5623 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
AAL2217 - 6 2026-07-13
AAL1695 American Airlines 6 2026-05-17
AAL2646 American Airlines 5 2026-06-07
AAL2461 - 5 2026-07-01
AAL1744 - 5 2026-06-28
AAL764 - 4 2026-07-11
AAL3209 American Airlines 4 2026-04-17
AAL3051 American Airlines 4 2026-04-14
AAL2806 - 4 2026-07-06
AAL2711 American Airlines 4 2026-04-17
AAL2275 American Airlines 4 2026-06-09
AAL2079 American Airlines 4 2026-05-17
AAL1938 - 4 2026-06-27
AAL1877 American Airlines 4 2026-05-02
AAL1677 - 4 2026-06-25
AAL1232 - 4 2026-06-19
AAL584 American Airlines 3 2026-05-04
AAL537 American Airlines 3 2026-06-17
AAL418 - 3 2026-06-25
AAL3323 American Airlines 3 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 AAL2217 - Jul 13, 21:00 UTCJul 13, 23:25 UTC2h 25m
2026-07-13 AAL2217 AUA → MIA Jul 13, 20:56 UTCJul 13, 23:24 UTC2h 28m
2026-07-13 AAL2217 - Jul 13, 17:05 UTCJul 13, 19:25 UTC2h 20m
2026-07-13 AAL243 - Jul 13, 15:00 UTCJul 13, 15:30 UTC30m
2026-07-13 AAL242 - Jul 13, 12:25 UTCJul 13, 13:00 UTC35m
2026-07-13 AAL242 MIA → HAV Jul 13, 12:23 UTCJul 13, 13:15 UTC52m
2026-07-13 AAL3070 - Jul 13, 06:10 UTCJul 13, 10:20 UTC4h 10m
2026-07-13 AAL2610 PHL → SLC Jul 13, 00:20 UTCJul 13, 04:25 UTC4h 5m
2026-07-12 AAL2610 PHL → PHL Jul 12, 23:40 UTCJul 12, 23:45 UTC5m
2026-07-12 AAL2819 ORD → PHL Jul 12, 20:40 UTCJul 12, 22:10 UTC1h 30m
2026-07-12 AAL2819 ORD → PHL Jul 12, 20:38 UTCJul 12, 22:11 UTC1h 33m
2026-07-12 AAL1598 - Jul 12, 15:15 UTCJul 12, 18:45 UTC3h 30m
2026-07-12 AAL1598 LAX → ORD Jul 12, 15:12 UTCJul 12, 18:54 UTC3h 42m
2026-07-12 AAL2567 - Jul 12, 04:15 UTCJul 12, 05:20 UTC1h 5m
2026-07-12 AAL2567 SFO → LAX Jul 12, 04:14 UTCJul 12, 05:15 UTC1h 1m
2026-07-12 AAL2567 LAX → SFO Jul 12, 02:20 UTCJul 12, 03:10 UTC50m
2026-07-11 AAL2883 - Jul 11, 22:30 UTCJul 11, 23:55 UTC1h 25m
2026-07-11 AAL764 - Jul 11, 17:05 UTCJul 11, 18:30 UTC1h 25m
2026-07-11 AAL764 LAX → PVR Jul 11, 17:05 UTCJul 11, 20:08 UTC3h 3m
2026-07-10 AAL2301 - Jul 10, 23:20 UTCJul 11, 04:01 UTC4h 40m
2026-07-10 AAL2301 - Jul 10, 16:40 UTCJul 10, 20:50 UTC4h 10m
2026-07-10 AAL598 - Jul 10, 11:20 UTCJul 10, 15:10 UTC3h 50m
2026-07-10 AAL2800 - Jul 10, 00:40 UTCJul 10, 02:25 UTC1h 45m
2026-07-10 AAL2800 DFW → IND Jul 10, 00:39 UTCJul 10, 02:21 UTC1h 42m
2026-07-09 AAL1356 ATL → DFW Jul 9, 21:30 UTCJul 9, 23:15 UTC1h 45m
2026-07-09 AAL1356 DFW → ATL Jul 9, 17:20 UTCJul 9, 19:20 UTC2h 0m
2026-07-09 AAL2653 - Jul 9, 13:25 UTCJul 9, 16:05 UTC2h 40m
2026-07-09 AAL3091 - Jul 9, 03:25 UTCJul 9, 06:05 UTC2h 40m
2026-07-09 AAL3091 DFW → FAT Jul 9, 03:20 UTCJul 9, 06:09 UTC2h 49m
2026-07-08 AAL312 DFW → DFW Jul 8, 17:45 UTCJul 9, 00:30 UTC6h 45m
2026-07-08 AAL1374 - Jul 8, 13:40 UTCJul 8, 15:45 UTC2h 5m
2026-07-08 AAL1374 MEX → DFW Jul 8, 13:36 UTCJul 8, 15:44 UTC2h 8m
2026-07-07 AAL2233 DFW → MEX Jul 7, 22:15 UTCJul 8, 00:25 UTC2h 10m
2026-07-07 AAL2873 - Jul 7, 18:20 UTCJul 7, 20:10 UTC1h 50m
2026-07-07 AAL2873 - Jul 7, 15:00 UTCJul 7, 16:40 UTC1h 40m
2026-07-07 AAL1561 - Jul 7, 11:10 UTCJul 7, 13:15 UTC2h 5m
2026-07-07 AAL981 DFW → GRR Jul 7, 01:45 UTCJul 7, 03:45 UTC2h 0m
2026-07-06 AAL1617 TUS → ORD Jul 6, 21:30 UTCJul 7, 00:15 UTC2h 45m
2026-07-06 AAL1617 TUS → ORD Jul 6, 17:40 UTCJul 6, 20:20 UTC2h 40m
2026-07-06 AAL1395 MSP → DFW Jul 6, 13:10 UTCJul 6, 15:00 UTC1h 50m
2026-07-06 AAL2806 DFW → MSP Jul 6, 00:40 UTCJul 6, 02:40 UTC2h 0m
2026-07-05 AAL2320 - Jul 5, 21:25 UTCJul 5, 23:15 UTC1h 50m
2026-07-05 AAL2320 PNS → DFW Jul 5, 21:24 UTCJul 5, 23:15 UTC1h 51m
2026-07-05 AAL2320 - Jul 5, 18:45 UTCJul 5, 20:10 UTC1h 25m
2026-07-04 AAL533 - Jul 4, 11:40 UTCJul 4, 14:35 UTC2h 55m
2026-07-04 AAL533 SYR → DFW Jul 4, 11:38 UTCJul 4, 14:34 UTC2h 56m
2026-07-04 AAL421 - Jul 4, 00:55 UTCJul 4, 03:30 UTC2h 35m
2026-07-04 AAL421 DFW → SYR Jul 4, 00:54 UTCJul 4, 03:36 UTC2h 42m
2026-07-03 AAL1601 CUN → DFW Jul 3, 16:20 UTCJul 3, 18:40 UTC2h 20m
2026-07-03 AAL1343 - Jul 3, 12:55 UTCJul 3, 15:05 UTC2h 10m

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 N959AN page for operator, model, and routing details .

Mode-S AD5623 frequently asked

What is Mode-S code AD5623?
AD5623 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N959AN.
Where is Mode-S AD5623 registered?
Mode-S code AD5623 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 AD5623 broadcasting right now?
No active broadcast right now. Last signal was 6h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD5623, octal 53253043, decimal 11,359,779.
What flights does AD5623 operate?
Mode-S AD5623 has broadcast 20 distinct callsigns, including AAL2217, AAL1695, AAL2646, AAL2461, AAL1744.