Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 1h ago
Flights observed
100
Distinct callsigns
1
Country
US
Last broadcast
1h ago

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 - 100 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-06-27 N437FA PAO → PAO Jun 27, 18:15 UTCJun 27, 18:29 UTC15m
2026-06-20 N437FA - Jun 20, 16:24 UTCJun 20, 17:04 UTC40m
2026-06-19 N437FA - Jun 19, 22:55 UTCJun 20, 01:24 UTC2h 30m
2026-06-19 N437FA PAO → PAO Jun 19, 20:14 UTCJun 19, 20:55 UTC40m
2026-06-19 N437FA SQL → SQL Jun 19, 00:29 UTCJun 19, 00:45 UTC15m
2026-06-19 N437FA SQL → SQL Jun 19, 00:14 UTCJun 19, 00:24 UTC10m
2026-06-18 N437FA SQL → SQL Jun 18, 23:55 UTCJun 19, 00:10 UTC14m
2026-06-18 N437FA PAO → SQL Jun 18, 23:25 UTCJun 18, 23:50 UTC25m
2026-06-18 N437FA PAO → PAO Jun 18, 19:30 UTCJun 18, 19:55 UTC25m
2026-06-18 N437FA - Jun 18, 18:50 UTCJun 18, 19:25 UTC35m
2026-06-18 N437FA PAO → PAO Jun 18, 16:30 UTCJun 18, 17:05 UTC35m
2026-06-18 N437FA - Jun 18, 00:20 UTCJun 18, 01:35 UTC1h 15m
2026-06-17 N437FA RHV → PAO Jun 17, 00:10 UTCJun 17, 00:45 UTC35m
2026-06-16 N437FA RHV → RHV Jun 16, 23:50 UTCJun 17, 00:05 UTC15m
2026-06-16 N437FA PAO → RHV Jun 16, 23:20 UTCJun 16, 23:40 UTC20m
2026-06-16 N437FA PAO → PAO Jun 16, 18:55 UTCJun 16, 20:10 UTC1h 16m
2026-06-15 N437FA - Jun 15, 22:25 UTCJun 15, 23:35 UTC1h 10m
2026-06-15 N437FA - Jun 15, 22:05 UTCJun 15, 22:20 UTC15m
2026-06-15 N437FA - Jun 15, 21:35 UTCJun 15, 22:00 UTC25m
2026-06-15 N437FA - Jun 15, 18:25 UTCJun 15, 19:14 UTC50m
2026-06-14 N437FA SQL → PAO Jun 14, 21:55 UTCJun 14, 22:30 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 1h ago.
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.