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sensors Mode-S transponder

A53D9D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N437FA · CESSNA 172 Skyhawk · operated by WHISKEY CHARLIE AERO LLC

Hex
A53D9D
Octal
51236635
Decimal
10,829,213
Country
US
Tail
N437FA
Type
C172
No current signal · last broadcast Jul 25, 00:25 UTC
Flights observed
121
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 00:25 UTC

Last known position

Most recent position reported by Mode-S A53D9D.

Country allocation

The ICAO 24-bit address A53D9D 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
N437FA - 121 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 N437FA - Jul 24, 22:55 UTCJul 25, 00:25 UTC1h 30m
2026-07-24 N437FA - Jul 24, 16:30 UTCJul 24, 17:50 UTC1h 20m
2026-07-23 N437FA PAO → PAO Jul 23, 23:00 UTCJul 24, 01:25 UTC2h 25m
2026-07-23 N437FA PAO → PAO Jul 23, 20:05 UTCJul 23, 20:50 UTC45m
2026-07-22 N437FA PAO → PAO Jul 22, 23:20 UTCJul 22, 23:50 UTC30m
2026-07-22 N437FA PAO → PAO Jul 22, 23:10 UTCJul 22, 23:15 UTC5m
2026-07-22 N437FA - Jul 22, 19:55 UTCJul 22, 20:45 UTC50m
2026-07-21 N437FA - Jul 21, 15:55 UTCJul 21, 16:50 UTC55m
2026-07-19 N437FA PAO → PAO Jul 19, 19:50 UTCJul 19, 20:40 UTC50m
2026-07-19 N437FA PAO → PAO Jul 19, 00:45 UTCJul 19, 02:10 UTC1h 25m
2026-07-18 N437FA - Jul 18, 21:40 UTCJul 18, 23:15 UTC1h 35m
2026-07-18 N437FA - Jul 18, 18:05 UTCJul 18, 19:10 UTC1h 5m
2026-07-18 N437FA - Jul 18, 00:55 UTCJul 18, 01:20 UTC25m
2026-07-17 N437FA - Jul 17, 17:35 UTCJul 17, 18:25 UTC50m
2026-07-16 N437FA - Jul 16, 19:35 UTCJul 16, 20:09 UTC35m
2026-07-16 N437FA - Jul 16, 03:15 UTCJul 16, 03:50 UTC35m
2026-07-16 N437FA - Jul 16, 02:35 UTCJul 16, 03:05 UTC30m
2026-07-16 N437FA PAO → SAC Jul 16, 01:30 UTCJul 16, 02:10 UTC40m
2026-07-15 N437FA PAO → PAO Jul 15, 17:50 UTCJul 15, 18:45 UTC55m
2026-07-15 N437FA PAO → PAO Jul 15, 02:00 UTCJul 15, 03:40 UTC1h 40m
2026-07-14 N437FA - Jul 14, 22:45 UTCJul 14, 23:50 UTC1h 5m
2026-07-14 N437FA PAO → PAO Jul 14, 20:10 UTCJul 14, 20:20 UTC10m
2026-07-14 N437FA PAO → PAO Jul 14, 18:45 UTCJul 14, 20:05 UTC1h 20m
2026-07-13 N437FA - Jul 13, 00:45 UTCJul 13, 00:50 UTC5m
2026-07-12 N437FA PAO → PAO Jul 12, 22:10 UTCJul 12, 22:50 UTC40m
2026-07-12 N437FA - Jul 12, 17:25 UTCJul 12, 18:45 UTC1h 20m
2026-07-11 N437FA RHV → PAO Jul 11, 21:25 UTCJul 11, 21:40 UTC15m
2026-07-11 N437FA PAO → RHV Jul 11, 20:55 UTCJul 11, 21:15 UTC20m
2026-07-11 N437FA PAO → PAO Jul 11, 18:05 UTCJul 11, 18:50 UTC45m
2026-07-11 N437FA PAO → PAO Jul 11, 00:40 UTCJul 11, 01:20 UTC40m
2026-07-10 N437FA - Jul 10, 21:05 UTCJul 10, 22:45 UTC1h 40m
2026-07-10 N437FA PAO → PAO Jul 10, 01:50 UTCJul 10, 03:20 UTC1h 30m
2026-07-08 N437FA PAO → PAO Jul 8, 20:30 UTCJul 8, 21:30 UTC1h 0m
2026-07-07 N437FA - Jul 7, 23:30 UTCJul 8, 00:45 UTC1h 15m
2026-07-06 N437FA - Jul 6, 20:40 UTCJul 6, 21:45 UTC1h 5m
2026-07-05 N437FA - Jul 5, 19:30 UTCJul 5, 20:25 UTC55m
2026-07-04 N437FA PAO → PAO Jul 4, 23:10 UTCJul 5, 00:05 UTC55m
2026-07-04 N437FA PAO → PAO Jul 4, 20:00 UTCJul 4, 20:35 UTC35m
2026-07-04 N437FA PAO → PAO Jul 4, 19:40 UTCJul 4, 19:50 UTC10m
2026-07-03 N437FA PAO → PAO Jul 3, 20:00 UTCJul 3, 20:45 UTC45m
2026-07-03 N437FA PAO → PAO Jul 3, 16:45 UTCJul 3, 18:10 UTC1h 25m
2026-07-01 N437FA - Jul 1, 23:10 UTCJul 2, 00:05 UTC55m
2026-07-01 N437FA - Jul 1, 19:55 UTCJul 1, 20:50 UTC55m
2026-06-30 N437FA PAO → PAO Jun 30, 22:35 UTCJul 1, 00:10 UTC1h 35m
2026-06-30 N437FA PAO → PAO Jun 30, 19:25 UTCJun 30, 20:15 UTC50m
2026-06-30 N437FA PAO → PAO Jun 30, 18:55 UTCJun 30, 19:20 UTC25m
2026-06-29 N437FA - Jun 29, 21:50 UTCJun 29, 23:29 UTC1h 40m
2026-06-29 N437FA PAO → PAO Jun 29, 00:54 UTCJun 29, 02:20 UTC1h 25m
2026-06-27 N437FA PAO → PAO Jun 27, 21:55 UTCJun 27, 22:45 UTC50m
2026-06-27 N437FA - Jun 27, 18:35 UTCJun 27, 19:09 UTC35m

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 N437FA page for operator, model, and routing details .

Mode-S A53D9D frequently asked

What is Mode-S code A53D9D?
A53D9D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N437FA.
Where is Mode-S A53D9D registered?
Mode-S code A53D9D 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 A53D9D broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 00:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A53D9D, octal 51236635, decimal 10,829,213.
What flights does A53D9D operate?
Mode-S A53D9D has broadcast 1 distinct callsign, including N437FA.