Apparatus

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sensors Mode-S transponder

AD5837

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N959XV · PIPER PA-23-250 Aztec · operated by AMERICAN AIRLINES INC

Hex
AD5837
Octal
53254067
Decimal
11,360,311
Country
US
Tail
N959XV
Type
PA27
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
552
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AD5837.

Country allocation

The ICAO 24-bit address AD5837 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
AAL2534 American Airlines 7 2026-05-13
AAL9734 - 6 2026-07-01
AAL685 American Airlines 6 2026-05-13
AAL2859 American Airlines 6 2026-04-18
AAL2845 American Airlines 6 2026-04-28
AAL2830 American Airlines 6 2026-05-29
AAL1120 - 6 2026-07-03
AAL9827 - 5 2026-07-01
AAL2568 - 5 2026-06-25
AAL2376 - 5 2026-06-25
AAL2109 American Airlines 5 2026-04-14
AAL2003 American Airlines 5 2026-04-16
AAL875 American Airlines 4 2026-07-25
AAL757 American Airlines 4 2026-05-05
AAL3102 - 4 2026-07-10
AAL2922 - 4 2026-07-03
AAL2852 American Airlines 4 2026-05-08
AAL2748 American Airlines 4 2026-05-31
AAL2634 - 4 2026-06-13
AAL2421 - 4 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL3083 LGA → MCO Jul 26, 21:10 UTCJul 26, 21:45 UTC35m
2026-07-26 AAL2687 PHL → CHS Jul 26, 17:10 UTCJul 26, 19:50 UTC2h 40m
2026-07-26 AAL2471 SNA → PHX Jul 26, 11:30 UTCJul 26, 15:35 UTC4h 5m
2026-07-26 AAL1170 BOS → MIA Jul 26, 05:10 UTCJul 26, 09:20 UTC4h 11m
2026-07-25 AAL3064 CLT → PDX Jul 25, 22:35 UTCJul 26, 03:30 UTC4h 55m
2026-07-25 AAL863 CLT → MBJ Jul 25, 18:40 UTCJul 25, 20:30 UTC1h 50m
2026-07-25 AAL875 MBJ → CLT Jul 25, 13:40 UTCJul 25, 15:20 UTC1h 40m
2026-07-25 AAL875 MBJ → CLT Jul 25, 13:38 UTCJul 25, 16:07 UTC2h 29m
2026-07-25 AAL461 MCO → CLT Jul 25, 10:45 UTCJul 25, 12:00 UTC1h 15m
2026-07-25 AAL563 PHL → CLT Jul 25, 05:30 UTCJul 25, 09:20 UTC3h 50m
2026-07-25 AAL563 PHL → CLT Jul 25, 02:30 UTCJul 25, 03:25 UTC55m
2026-07-25 AAL2466 PHX → SNA Jul 25, 00:25 UTCJul 25, 01:15 UTC50m
2026-07-24 AAL2972 DEN → PHL Jul 24, 19:40 UTCJul 24, 22:50 UTC3h 10m
2026-07-24 AAL3047 MIA → LGA Jul 24, 17:20 UTCJul 24, 18:25 UTC1h 5m
2026-07-24 AAL3047 MIA → LGA Jul 24, 17:19 UTCJul 24, 18:20 UTC1h 1m
2026-07-24 AAL3009 EGE → DFW Jul 24, 12:15 UTCJul 24, 15:55 UTC3h 40m
2026-07-24 AAL2721 MCO → ORD Jul 24, 02:05 UTCJul 24, 06:20 UTC4h 15m
2026-07-23 AAL1075 LGA → RDU Jul 23, 15:55 UTCJul 24, 00:20 UTC8h 25m
2026-07-23 AAL2115 DCA → LGA Jul 23, 11:50 UTCJul 23, 13:20 UTC1h 30m
2026-07-23 AAL2977 BOS → DCA Jul 23, 06:25 UTCJul 23, 09:40 UTC3h 15m
2026-07-23 AAL2977 BOS → DCA Jul 23, 06:22 UTCJul 23, 09:39 UTC3h 17m
2026-07-23 AAL2977 BOS → DCA Jul 23, 00:40 UTCJul 23, 04:40 UTC4h 0m
2026-07-22 AAL1050 DFW → BUF Jul 22, 19:00 UTCJul 22, 22:30 UTC3h 30m
2026-07-22 AAL1050 DFW → BUF Jul 22, 18:57 UTCJul 22, 22:36 UTC3h 39m
2026-07-22 AAL1943 PHL → PWM Jul 22, 11:15 UTCJul 22, 15:50 UTC4h 35m
2026-07-21 AAL543 STL → PHL Jul 21, 16:40 UTCJul 21, 20:40 UTC4h 0m
2026-07-21 AAL2027 DCA → LGA Jul 21, 13:25 UTCJul 21, 14:20 UTC55m
2026-07-21 AAL1569 PHX → BOS Jul 21, 05:25 UTCJul 21, 08:00 UTC2h 35m
2026-07-21 AAL1569 PHX → BOS Jul 21, 05:05 UTCJul 21, 08:20 UTC3h 15m
2026-07-21 AAL1569 PHX → BOS Jul 21, 01:40 UTCJul 21, 03:55 UTC2h 15m
2026-07-20 AAL543 - Jul 20, 21:35 UTCJul 20, 22:10 UTC35m
2026-07-20 AAL543 - Jul 20, 16:30 UTCJul 20, 20:35 UTC4h 5m
2026-07-20 AAL625 - Jul 20, 13:50 UTCJul 20, 14:40 UTC50m
2026-07-20 AAL2056 DCA → LGA Jul 20, 00:40 UTCJul 20, 04:50 UTC4h 10m
2026-07-19 AAL2127 LGA → DCA Jul 19, 21:45 UTCJul 19, 23:10 UTC1h 25m
2026-07-19 AAL2127 LGA → DCA Jul 19, 18:35 UTCJul 19, 19:50 UTC1h 15m
2026-07-19 AAL3320 PWM → PHL Jul 19, 16:05 UTCJul 19, 17:20 UTC1h 15m
2026-07-19 AAL3320 PWM → PHL Jul 19, 11:50 UTCJul 19, 13:05 UTC1h 15m
2026-07-19 AAL2468 - Jul 19, 05:40 UTCJul 19, 09:45 UTC4h 5m
2026-07-18 AAL2056 DCA → LGA Jul 18, 22:05 UTCJul 19, 02:20 UTC4h 15m
2026-07-18 AAL1960 - Jul 18, 15:30 UTCJul 18, 20:15 UTC4h 45m
2026-07-18 AAL1960 SFO → CLT Jul 18, 15:26 UTCJul 18, 20:13 UTC4h 47m
2026-07-17 AAL2556 - Jul 17, 22:00 UTCJul 18, 02:40 UTC4h 40m
2026-07-17 AAL611 FLL → PHL Jul 17, 13:50 UTCJul 17, 19:55 UTC6h 5m
2026-07-17 AAL3182 - Jul 17, 10:20 UTCJul 17, 12:00 UTC1h 40m
2026-07-17 AAL3182 BDL → CLT Jul 17, 10:14 UTCJul 17, 11:48 UTC1h 34m
2026-07-17 AAL2763 - Jul 17, 02:15 UTCJul 17, 03:39 UTC1h 25m
2026-07-17 AAL2763 CLT → BDL Jul 17, 02:10 UTCJul 17, 03:36 UTC1h 26m
2026-07-16 AAL2407 - Jul 16, 22:45 UTCJul 17, 00:50 UTC2h 5m
2026-07-16 AAL2687 SAN → DFW Jul 16, 17:22 UTCJul 16, 20:03 UTC2h 41m

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 N959XV page for operator, model, and routing details .

Mode-S AD5837 frequently asked

What is Mode-S code AD5837?
AD5837 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N959XV.
Where is Mode-S AD5837 registered?
Mode-S code AD5837 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 AD5837 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD5837, octal 53254067, decimal 11,360,311.
What flights does AD5837 operate?
Mode-S AD5837 has broadcast 20 distinct callsigns, including AAL2534, AAL9734, AAL685, AAL2859, AAL2845.