Apparatus

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sensors Mode-S transponder

A53720

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N435QS · GULFSTREAM 4 · operated by NJI SALES INC

Hex
A53720
Octal
51233440
Decimal
10,827,552
Country
US
Tail
N435QS
Type
GLF4
No current signal · last broadcast 16h ago
Flights observed
105
Distinct callsigns
1
Country
US
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S A53720.

Country allocation

The ICAO 24-bit address A53720 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 1 distinct

Callsign Airline Flights Last seen
EJM435 - 105 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 EJM435 - Jul 17, 14:15 UTCJul 17, 16:59 UTC2h 45m
2026-07-17 EJM435 - Jul 17, 10:44 UTCJul 17, 12:50 UTC2h 5m
2026-07-16 EJM435 HWO → MSP Jul 16, 19:05 UTCJul 16, 22:15 UTC3h 10m
2026-07-16 EJM435 - Jul 16, 15:55 UTCJul 16, 16:09 UTC15m
2026-07-16 EJM435 - Jul 16, 13:00 UTCJul 16, 15:05 UTC2h 5m
2026-07-15 EJM435 - Jul 15, 20:50 UTCJul 15, 21:35 UTC45m
2026-07-15 EJM435 - Jul 15, 18:45 UTCJul 15, 20:10 UTC1h 25m
2026-07-15 EJM435 ORL → TEB Jul 15, 14:00 UTCJul 15, 16:10 UTC2h 10m
2026-07-15 EJM435 - Jul 15, 12:00 UTCJul 15, 12:30 UTC30m
2026-07-13 EJM435 - Jul 13, 18:40 UTCJul 13, 19:10 UTC30m
2026-07-13 EJM435 - Jul 13, 13:30 UTCJul 13, 15:20 UTC1h 50m
2026-07-12 EJM435 - Jul 12, 18:40 UTCJul 12, 19:10 UTC30m
2026-07-06 EJM435 - Jul 6, 16:55 UTCJul 6, 19:10 UTC2h 15m
2026-07-06 EJM435 - Jul 6, 00:20 UTCJul 6, 02:30 UTC2h 10m
2026-07-05 EJM435 - Jul 5, 21:00 UTCJul 5, 22:30 UTC1h 30m
2026-07-03 EJM435 - Jul 3, 22:10 UTCJul 3, 22:20 UTC10m
2026-07-03 EJM435 - Jul 3, 19:20 UTCJul 3, 21:05 UTC1h 45m
2026-07-03 EJM435 - Jul 3, 15:25 UTCJul 3, 17:45 UTC2h 20m
2026-06-29 EJM435 - Jun 29, 00:39 UTCJun 29, 04:30 UTC3h 50m
2026-06-28 EJM435 - Jun 28, 23:25 UTCJun 29, 00:34 UTC1h 10m
2026-06-28 EJM435 - Jun 28, 18:49 UTCJun 28, 20:25 UTC1h 35m
2026-06-27 EJM435 LRF → MDW Jun 27, 22:04 UTCJun 27, 23:19 UTC1h 15m
2026-06-27 EJM435 - Jun 27, 20:04 UTCJun 27, 21:04 UTC1h 0m
2026-06-27 EJM435 - Jun 27, 17:39 UTCJun 27, 18:09 UTC30m
2026-06-26 EJM435 OAK → ORL Jun 26, 22:40 UTCJun 27, 03:15 UTC4h 35m
2026-06-26 EJM435 - Jun 26, 18:49 UTCJun 26, 20:20 UTC1h 30m
2026-06-26 EJM435 - Jun 26, 01:34 UTCJun 26, 02:54 UTC1h 20m
2026-06-25 EJM435 AUS → SJC Jun 25, 18:39 UTCJun 26, 00:45 UTC6h 5m
2026-06-24 EJM435 - Jun 24, 17:59 UTCJun 24, 20:09 UTC2h 10m
2026-06-24 EJM435 - Jun 24, 15:39 UTCJun 24, 16:29 UTC50m
2026-06-24 EJM435 - Jun 24, 14:20 UTCJun 24, 15:05 UTC45m
2026-06-23 EJM435 IAD → HPN Jun 23, 18:29 UTCJun 23, 19:19 UTC50m
2026-06-22 EJM435 ORL → IAD Jun 22, 17:34 UTCJun 22, 20:00 UTC2h 25m
2026-06-22 EJM435 - Jun 22, 15:35 UTCJun 22, 16:10 UTC35m
2026-06-21 EJM435 - Jun 21, 19:34 UTCJun 21, 23:00 UTC3h 25m
2026-06-21 EJM435 - Jun 21, 12:55 UTCJun 21, 16:25 UTC3h 30m
2026-06-20 EJM435 - Jun 20, 20:25 UTCJun 20, 23:50 UTC3h 25m
2026-06-18 EJM435 BIL → BOS Jun 18, 17:30 UTCJun 18, 20:50 UTC3h 20m
2026-06-17 EJM435 - Jun 17, 18:15 UTCJun 18, 17:35 UTC23h 20m
2026-06-17 EJM435 - Jun 17, 13:05 UTCJun 17, 17:30 UTC4h 25m
2026-06-08 EJM435 PVU → TEB Jun 8, 18:55 UTCJun 8, 22:40 UTC3h 45m
2026-06-08 EJM435 OXR → PVU Jun 8, 16:45 UTCJun 8, 18:10 UTC1h 25m
2026-06-07 EJM435 - Jun 7, 19:00 UTCJun 8, 00:30 UTC5h 30m
2026-06-07 EJM435 - Jun 7, 17:00 UTCJun 7, 17:15 UTC15m
2026-06-06 EJM435 - Jun 6, 23:15 UTCJun 7, 01:40 UTC2h 25m
2026-06-05 EJM435 - Jun 5, 15:20 UTCJun 5, 20:20 UTC5h 0m
2026-06-04 EJM435 - Jun 4, 23:30 UTCJun 5, 00:00 UTC30m
2026-06-04 EJM435 - Jun 4, 18:05 UTCJun 4, 22:40 UTC4h 35m
2026-06-04 EJM435 - Jun 4, 15:15 UTCJun 4, 17:15 UTC2h 0m
2026-06-01 EJM435 - Jun 1, 21:15 UTCJun 1, 21:25 UTC10m

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 N435QS page for operator, model, and routing details .

Mode-S A53720 frequently asked

What is Mode-S code A53720?
A53720 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N435QS.
Where is Mode-S A53720 registered?
Mode-S code A53720 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 A53720 broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53720, octal 51233440, decimal 10,827,552.
What flights does A53720 operate?
Mode-S A53720 has broadcast 1 distinct callsign, including EJM435.