Apparatus

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sensors Mode-S transponder

A1A37A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N20417 · CESSNA 172 Skyhawk · operated by ATPCE LLC

Hex
A1A37A
Octal
50321572
Decimal
10,593,146
Country
US
Tail
N20417
Type
C172
No current signal · last broadcast 8h ago
Flights observed
137
Distinct callsigns
1
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A1A37A.

Country allocation

The ICAO 24-bit address A1A37A 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
CXK104 - 137 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CXK104 - Jul 17, 23:00 UTCJul 17, 23:55 UTC55m
2026-07-17 CXK104 - Jul 17, 20:35 UTCJul 17, 21:55 UTC1h 20m
2026-07-17 CXK104 - Jul 17, 17:35 UTCJul 17, 19:09 UTC1h 35m
2026-07-17 CXK104 - Jul 17, 14:20 UTCJul 17, 16:44 UTC2h 25m
2026-07-16 CXK104 - Jul 16, 23:29 UTCJul 17, 00:10 UTC40m
2026-07-16 CXK104 - Jul 16, 20:19 UTCJul 16, 21:55 UTC1h 35m
2026-07-16 CXK104 - Jul 16, 18:50 UTCJul 16, 19:25 UTC35m
2026-07-16 CXK104 - Jul 16, 17:10 UTCJul 16, 18:00 UTC50m
2026-07-16 CXK104 - Jul 16, 14:10 UTCJul 16, 16:09 UTC2h 0m
2026-07-16 CXK104 - Jul 16, 00:30 UTCJul 16, 01:20 UTC50m
2026-07-15 CXK104 - Jul 15, 22:25 UTCJul 15, 23:10 UTC45m
2026-07-15 CXK104 - Jul 15, 20:10 UTCJul 15, 21:05 UTC55m
2026-07-15 CXK104 - Jul 15, 15:30 UTCJul 15, 16:35 UTC1h 5m
2026-07-14 CXK104 - Jul 14, 23:05 UTCJul 15, 00:00 UTC55m
2026-07-14 CXK104 - Jul 14, 21:40 UTCJul 14, 21:50 UTC10m
2026-07-14 CXK104 - Jul 14, 19:20 UTCJul 14, 20:15 UTC55m
2026-07-14 CXK104 - Jul 14, 17:40 UTCJul 14, 18:35 UTC55m
2026-07-14 CXK104 - Jul 14, 15:00 UTCJul 14, 16:35 UTC1h 35m
2026-07-14 CXK104 - Jul 14, 02:30 UTCJul 14, 03:15 UTC45m
2026-07-13 CXK104 - Jul 13, 20:00 UTCJul 13, 21:35 UTC1h 35m
2026-07-13 CXK104 - Jul 13, 15:45 UTCJul 13, 17:35 UTC1h 50m
2026-07-13 CXK104 - Jul 13, 02:15 UTCJul 13, 03:10 UTC55m
2026-07-12 CXK104 - Jul 12, 21:45 UTCJul 12, 23:30 UTC1h 45m
2026-07-12 CXK104 - Jul 12, 00:20 UTCJul 12, 02:05 UTC1h 45m
2026-07-11 CXK104 - Jul 11, 22:20 UTCJul 11, 23:35 UTC1h 15m
2026-07-11 CXK104 - Jul 11, 19:40 UTCJul 11, 20:55 UTC1h 15m
2026-07-11 CXK104 - Jul 11, 16:55 UTCJul 11, 18:25 UTC1h 30m
2026-07-10 CXK104 - Jul 10, 21:20 UTCJul 10, 22:45 UTC1h 25m
2026-07-10 CXK104 - Jul 10, 17:45 UTCJul 10, 18:15 UTC30m
2026-07-09 CXK104 - Jul 9, 20:30 UTCJul 9, 22:55 UTC2h 25m
2026-07-09 CXK104 - Jul 9, 17:05 UTCJul 9, 18:55 UTC1h 50m
2026-07-08 CXK104 - Jul 8, 22:25 UTCJul 8, 23:15 UTC50m
2026-07-08 CXK104 - Jul 8, 19:30 UTCJul 8, 21:20 UTC1h 50m
2026-07-08 CXK104 - Jul 8, 17:15 UTCJul 8, 18:35 UTC1h 20m
2026-07-08 CXK104 - Jul 8, 14:45 UTCJul 8, 16:20 UTC1h 35m
2026-07-07 CXK104 - Jul 7, 23:55 UTCJul 8, 00:35 UTC40m
2026-07-07 CXK104 - Jul 7, 20:30 UTCJul 7, 22:00 UTC1h 30m
2026-07-07 CXK104 - Jul 7, 17:25 UTCJul 7, 18:35 UTC1h 10m
2026-07-07 CXK104 - Jul 7, 15:45 UTCJul 7, 16:25 UTC40m
2026-07-07 CXK104 - Jul 7, 14:40 UTCJul 7, 15:30 UTC50m
2026-07-06 CXK104 - Jul 6, 22:10 UTCJul 6, 23:55 UTC1h 45m
2026-07-06 CXK104 LGB → LGB Jul 6, 17:15 UTCJul 6, 18:35 UTC1h 20m
2026-07-06 CXK104 - Jul 6, 15:15 UTCJul 6, 16:25 UTC1h 10m
2026-07-06 CXK104 LGB → CLD Jul 6, 14:15 UTCJul 6, 15:10 UTC55m
2026-07-04 CXK104 - Jul 4, 18:50 UTCJul 4, 19:45 UTC55m
2026-07-04 CXK104 LGB → LGB Jul 4, 17:00 UTCJul 4, 17:50 UTC50m
2026-07-04 CXK104 - Jul 4, 00:25 UTCJul 4, 00:55 UTC30m
2026-07-03 CXK104 - Jul 3, 22:45 UTCJul 4, 00:00 UTC1h 15m
2026-07-03 CXK104 - Jul 3, 20:20 UTCJul 3, 21:20 UTC1h 0m
2026-07-03 CXK104 - Jul 3, 15:05 UTCJul 3, 15:45 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 N20417 page for operator, model, and routing details .

Mode-S A1A37A frequently asked

What is Mode-S code A1A37A?
A1A37A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N20417.
Where is Mode-S A1A37A registered?
Mode-S code A1A37A 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 A1A37A broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A37A, octal 50321572, decimal 10,593,146.
What flights does A1A37A operate?
Mode-S A1A37A has broadcast 1 distinct callsign, including CXK104.