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 Jul 26, 22:35 UTC
Flights observed
539
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:35 UTC

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
AAL2452 American Airlines 5 2026-07-26
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL1253 SFO → ORD Jul 26, 20:25 UTCJul 26, 22:35 UTC2h 10m
2026-07-26 AAL2452 JAX → PHL Jul 26, 17:05 UTCJul 26, 19:00 UTC1h 55m
2026-07-26 AAL2452 JAX → PHL Jul 26, 17:02 UTCJul 26, 19:10 UTC2h 8m
2026-07-26 AAL2452 JAX → PHL Jul 26, 13:45 UTCJul 26, 15:20 UTC1h 35m
2026-07-26 AAL3324 BOS → ORD Jul 26, 09:20 UTCJul 26, 11:25 UTC2h 5m
2026-07-26 AAL2539 MIA → BOS Jul 26, 01:10 UTCJul 26, 03:50 UTC2h 40m
2026-07-25 AAL910 RDU → DCA Jul 25, 22:55 UTCJul 25, 23:15 UTC20m
2026-07-25 AAL910 RDU → DCA Jul 25, 20:55 UTCJul 25, 21:05 UTC10m
2026-07-25 AAL925 PHL → LAX Jul 25, 19:10 UTCJul 25, 19:30 UTC20m
2026-07-25 AAL925 PHL → LAX Jul 25, 17:20 UTCJul 25, 17:35 UTC15m
2026-07-25 AAL1347 BOS → DFW Jul 25, 13:00 UTCJul 25, 15:25 UTC2h 25m
2026-07-25 AAL3021 DFW → CMH Jul 25, 00:15 UTCJul 25, 03:10 UTC2h 55m
2026-07-24 AAL3309 DTW → DFW Jul 24, 21:25 UTCJul 24, 22:25 UTC1h 0m
2026-07-24 AAL2735 LGA → DFW Jul 24, 17:20 UTCJul 24, 19:50 UTC2h 30m
2026-07-24 AAL2735 LGA → DFW Jul 24, 13:15 UTCJul 24, 15:50 UTC2h 35m
2026-07-23 AAL2595 BDL → MIA Jul 23, 23:10 UTCJul 24, 00:40 UTC1h 30m
2026-07-23 AAL573R PHL → CLT Jul 23, 20:05 UTCJul 23, 21:25 UTC1h 20m
2026-07-23 AAL3063 SJU → PHL Jul 23, 16:55 UTCJul 23, 18:35 UTC1h 40m
2026-07-23 AAL3063 SJU → PHL Jul 23, 15:00 UTCJul 23, 15:10 UTC10m
2026-07-23 AAL3065 DFW → ORD Jul 23, 03:05 UTCJul 23, 03:30 UTC25m
2026-07-22 AAL3065 DFW → ORD Jul 22, 23:40 UTCJul 23, 01:00 UTC1h 20m
2026-07-22 AAL3065 DFW → ORD Jul 22, 23:39 UTCJul 23, 03:26 UTC3h 47m
2026-07-22 AAL2439 PHL → MIA Jul 22, 20:00 UTCJul 22, 22:15 UTC2h 15m
2026-07-22 AAL2439 PHL → MIA Jul 22, 16:10 UTCJul 22, 18:35 UTC2h 25m
2026-07-22 AAL1115 RDU → PHL Jul 22, 12:15 UTCJul 22, 13:15 UTC1h 0m
2026-07-21 AAL2332 TPA → PHL Jul 21, 22:55 UTCJul 22, 03:05 UTC4h 10m
2026-07-21 AAL2477 STL → CLT Jul 21, 20:15 UTCJul 21, 21:10 UTC55m
2026-07-21 AAL2477 STL → CLT Jul 21, 18:05 UTCJul 21, 19:05 UTC1h 0m
2026-07-21 AAL2601 ORD → PVR Jul 21, 11:20 UTCJul 21, 15:05 UTC3h 45m
2026-07-21 AAL1566 MIA → RDU Jul 21, 04:15 UTCJul 21, 04:50 UTC35m
2026-07-20 AAL1566 MIA → RDU Jul 20, 23:30 UTCJul 21, 02:05 UTC2h 34m
2026-07-20 AAL830 LAS → CLT Jul 20, 19:00 UTCJul 20, 21:20 UTC2h 20m
2026-07-20 AAL830 LAS → CLT Jul 20, 18:41 UTCJul 20, 21:20 UTC2h 39m
2026-07-20 AAL821 EWR → DFW Jul 20, 14:15 UTCJul 20, 14:35 UTC20m
2026-07-20 AAL821 EWR → DFW Jul 20, 14:14 UTCJul 20, 16:49 UTC2h 35m
2026-07-20 AAL412 - Jul 20, 10:00 UTCJul 20, 12:35 UTC2h 35m
2026-07-20 AAL412 BDL → MIA Jul 20, 09:58 UTCJul 20, 12:31 UTC2h 33m
2026-07-20 AAL1272 MIA → BDL Jul 20, 00:55 UTCJul 20, 03:25 UTC2h 30m
2026-07-20 AAL1272 MIA → BDL Jul 20, 00:52 UTCJul 20, 03:25 UTC2h 33m
2026-07-19 AAL2581 SJU → MIA Jul 19, 21:14 UTCJul 19, 23:34 UTC2h 20m
2026-07-19 AAL2581 - Jul 19, 19:40 UTCJul 19, 19:50 UTC10m
2026-07-19 AAL2581 - Jul 19, 17:40 UTCJul 19, 18:00 UTC20m
2026-07-19 AAL902 CID → DFW Jul 19, 00:30 UTCJul 19, 15:20 UTC14h 50m
2026-07-18 AAL914 CTG → MIA Jul 18, 20:14 UTCJul 18, 22:35 UTC2h 21m
2026-07-18 AAL914 CTG → MIA Jul 18, 20:15 UTCJul 18, 22:35 UTC2h 20m
2026-07-18 AAL2173 - Jul 18, 16:35 UTCJul 18, 18:55 UTC2h 20m
2026-07-18 AAL1498 - Jul 18, 12:10 UTCJul 18, 14:50 UTC2h 40m
2026-07-17 AAL257 - Jul 17, 23:14 UTCJul 18, 02:00 UTC2h 45m
2026-07-17 AAL3034 MGA → MIA Jul 17, 18:49 UTCJul 17, 21:02 UTC2h 13m
2026-07-17 AAL3034 - Jul 17, 15:20 UTCJul 17, 21:10 UTC5h 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 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 Jul 26, 22:35 UTC.
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, AAL2452.