Apparatus

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sensors Mode-S transponder

A252DD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N249QS · operated by F9 INVESTMENTS LLC, BANK OF AMERICA NA, KAINALU LLC, MACDONALD ROBERT, MACDONALD MARYANN, TVPX AIRCRAFT SOLUTIONS INC TRUSTEE

Hex
A252DD
Octal
50451335
Decimal
10,638,045
Country
US
Tail
N249QS
Type
CL60
No current signal · last broadcast 9d ago
Flights observed
103
Distinct callsigns
2
Country
US
Last broadcast
9d ago

Last known position

Most recent position reported by Mode-S A252DD.

Country allocation

The ICAO 24-bit address A252DD 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 2 distinct

Callsign Airline Flights Last seen
EJA249 NetJets 93 2026-07-25
N249QS - 10 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 EJA249 SWF → HPN Jul 25, 19:00 UTCJul 25, 21:45 UTC2h 45m
2026-07-18 EJA249 SWF → HPN Jul 18, 14:45 UTCJul 18, 18:35 UTC3h 50m
2026-07-17 EJA249 SWF → HPN Jul 17, 20:55 UTCJul 17, 23:30 UTC2h 35m
2026-07-17 EJA249 SWF → HPN Jul 17, 14:10 UTCJul 17, 16:40 UTC2h 30m
2026-07-17 N249QS - Jul 17, 00:30 UTCJul 17, 01:00 UTC30m
2026-07-16 N249QS - Jul 16, 22:49 UTCJul 16, 23:15 UTC25m
2026-07-16 EJA249 - Jul 16, 17:54 UTCJul 16, 19:25 UTC1h 30m
2026-07-16 EJA249 - Jul 16, 01:35 UTCJul 16, 02:20 UTC45m
2026-07-15 EJA249 - Jul 15, 23:05 UTCJul 16, 00:50 UTC1h 45m
2026-07-10 EJA249 - Jul 10, 13:00 UTCJul 10, 14:50 UTC1h 50m
2026-07-08 EJA249 - Jul 8, 23:00 UTCJul 8, 23:55 UTC55m
2026-07-08 EJA249 - Jul 8, 21:45 UTCJul 8, 22:05 UTC20m
2026-07-08 EJA249 - Jul 8, 17:20 UTCJul 8, 18:15 UTC55m
2026-07-08 EJA249 YUL → LEX Jul 8, 13:45 UTCJul 8, 15:30 UTC1h 45m
2026-07-07 EJA249 ORL → YUL Jul 7, 20:35 UTCJul 7, 23:15 UTC2h 40m
2026-07-07 EJA249 TPA → ORL Jul 7, 18:50 UTCJul 7, 19:20 UTC30m
2026-07-07 EJA249 - Jul 7, 14:55 UTCJul 7, 17:05 UTC2h 10m
2026-07-07 EJA249 - Jul 7, 13:45 UTCJul 7, 14:15 UTC30m
2026-07-06 EJA249 LAS → HPN Jul 6, 14:45 UTCJul 6, 19:15 UTC4h 30m
2026-07-02 EJA249 - Jul 2, 13:15 UTCJul 2, 18:00 UTC4h 45m
2026-07-01 EJA249 SWF → HPN Jul 1, 22:45 UTCJul 1, 23:00 UTC15m
2026-07-01 EJA249 SWF → HPN Jul 1, 19:10 UTCJul 1, 21:25 UTC2h 15m
2026-07-01 EJA249 SWF → HPN Jul 1, 17:25 UTCJul 1, 17:40 UTC15m
2026-07-01 EJA249 SWF → HPN Jul 1, 14:40 UTCJul 1, 16:20 UTC1h 40m
2026-07-01 EJA249 SWF → HPN Jul 1, 11:40 UTCJul 1, 13:00 UTC1h 20m
2026-06-28 EJA249 SWF → HPN Jun 28, 16:25 UTCJun 28, 19:09 UTC2h 45m
2026-06-28 EJA249 SWF → HPN Jun 28, 14:45 UTCJun 28, 14:59 UTC15m
2026-06-27 EJA249 SWF → HPN Jun 27, 22:09 UTCJun 27, 23:39 UTC1h 30m
2026-06-27 EJA249 SWF → HPN Jun 27, 16:35 UTCJun 27, 20:49 UTC4h 15m
2026-06-26 EJA249 SWF → HPN Jun 26, 21:15 UTCJun 26, 22:29 UTC1h 15m
2026-06-26 EJA249 SWF → HPN Jun 26, 18:29 UTCJun 26, 19:35 UTC1h 5m
2026-06-26 EJA249 SWF → HPN Jun 26, 15:34 UTCJun 26, 16:35 UTC1h 0m
2026-06-25 EJA249 SWF → HPN Jun 25, 21:29 UTCJun 26, 01:50 UTC4h 20m
2026-06-25 EJA249 SWF → HPN Jun 25, 19:24 UTCJun 25, 20:19 UTC55m
2026-06-25 EJA249 SWF → HPN Jun 25, 16:29 UTCJun 25, 18:15 UTC1h 45m
2026-06-25 EJA249 SWF → HPN Jun 25, 02:05 UTCJun 25, 02:59 UTC55m
2026-06-25 EJA249 SWF → HPN Jun 25, 00:14 UTCJun 25, 00:59 UTC45m
2026-06-24 N249QS - Jun 24, 17:05 UTCJun 24, 23:00 UTC5h 55m
2026-06-23 N249QS - Jun 23, 19:34 UTCJun 24, 19:15 UTC23h 40m
2026-06-23 EJA249 SWF → HPN Jun 23, 14:59 UTCJun 23, 17:50 UTC2h 50m
2026-06-22 EJA249 SWF → HPN Jun 22, 23:14 UTCJun 22, 23:35 UTC20m
2026-06-22 EJA249 SWF → HPN Jun 22, 16:24 UTCJun 22, 21:30 UTC5h 5m
2026-06-22 EJA249 SWF → HPN Jun 22, 13:44 UTCJun 22, 14:40 UTC55m
2026-06-21 N249QS AUS → VNY Jun 21, 13:34 UTCJun 21, 19:45 UTC6h 10m
2026-06-20 N249QS LDJ → AUS Jun 20, 15:34 UTCJun 20, 23:29 UTC7h 55m
2026-06-20 EJA249 SWF → HPN Jun 20, 00:49 UTCJun 20, 01:39 UTC50m
2026-06-19 EJA249 SWF → HPN Jun 19, 19:25 UTCJun 19, 21:54 UTC2h 30m
2026-06-17 N249QS - Jun 17, 14:10 UTCJun 17, 18:10 UTC4h 0m
2026-06-15 N249QS - Jun 15, 19:05 UTCJun 15, 19:50 UTC45m
2026-06-15 EJA249 SWF → HPN Jun 15, 12:30 UTCJun 15, 13:10 UTC40m

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 N249QS page for operator, model, and routing details .

Mode-S A252DD frequently asked

What is Mode-S code A252DD?
A252DD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N249QS.
Where is Mode-S A252DD registered?
Mode-S code A252DD 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 A252DD broadcasting right now?
No active broadcast right now. Last signal was 9d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A252DD, octal 50451335, decimal 10,638,045.
What flights does A252DD operate?
Mode-S A252DD has broadcast 2 distinct callsigns, including EJA249, N249QS.