Apparatus

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sensors Mode-S transponder

A6CE21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N53797 · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
A6CE21
Octal
51547041
Decimal
10,931,745
Country
US
Tail
N53797
Type
C172
No current signal · last broadcast 7h ago
Flights observed
125
Distinct callsigns
1
Country
US
Last broadcast
7h ago

Last known position

Most recent position reported by Mode-S A6CE21.

Country allocation

The ICAO 24-bit address A6CE21 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
N53797 - 125 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-06 N53797 CCB → CCB Jun 6, 19:30 UTCJun 6, 20:49 UTC1h 20m
2026-06-06 N53797 CCB → CCB Jun 6, 16:50 UTCJun 6, 18:25 UTC1h 35m
2026-06-05 N53797 - Jun 5, 22:05 UTCJun 5, 22:40 UTC35m
2026-06-05 N53797 CCB → CCB Jun 5, 17:50 UTCJun 5, 18:50 UTC1h 0m
2026-06-05 N53797 CCB → CCB Jun 5, 15:10 UTCJun 5, 16:20 UTC1h 10m
2026-06-04 N53797 - Jun 4, 21:50 UTCJun 4, 22:45 UTC55m
2026-06-04 N53797 CCB → CCB Jun 4, 19:40 UTCJun 4, 20:55 UTC1h 15m
2026-06-04 N53797 CCB → CCB Jun 4, 18:05 UTCJun 4, 18:45 UTC40m
2026-06-04 N53797 CCB → CCB Jun 4, 15:15 UTCJun 4, 16:00 UTC45m
2026-06-04 N53797 AVX → CCB Jun 4, 00:10 UTCJun 4, 00:50 UTC40m
2026-06-03 N53797 CCB → AVX Jun 3, 22:00 UTCJun 3, 22:40 UTC40m
2026-06-03 N53797 CCB → CCB Jun 3, 19:45 UTCJun 3, 20:40 UTC55m
2026-06-03 N53797 CCB → CCB Jun 3, 18:20 UTCJun 3, 18:50 UTC30m
2026-06-02 N53797 CCB → CCB Jun 2, 22:20 UTCJun 2, 23:10 UTC50m
2026-06-02 N53797 CCB → CCB Jun 2, 20:10 UTCJun 2, 21:15 UTC1h 5m
2026-06-02 N53797 - Jun 2, 18:05 UTCJun 2, 19:20 UTC1h 15m
2026-06-01 N53797 - Jun 1, 17:55 UTCJun 1, 18:20 UTC25m
2026-06-01 N53797 - Jun 1, 15:35 UTCJun 1, 16:40 UTC1h 5m
2026-06-01 N53797 SEE → CCB Jun 1, 00:45 UTCJun 1, 02:40 UTC1h 55m
2026-05-31 N53797 - May 31, 21:55 UTCMay 31, 22:55 UTC1h 0m
2026-05-31 N53797 - May 31, 17:45 UTCMay 31, 18:45 UTC1h 0m
2026-05-30 N53797 - May 30, 19:50 UTCMay 30, 20:20 UTC30m
2026-05-30 N53797 - May 30, 17:25 UTCMay 30, 18:50 UTC1h 25m
2026-05-29 N53797 CCB → CCB May 29, 21:00 UTCMay 29, 22:05 UTC1h 5m
2026-05-29 N53797 CCB → CCB May 29, 18:50 UTCMay 29, 19:45 UTC55m
2026-05-28 N53797 CCB → CCB May 28, 20:30 UTCMay 28, 21:20 UTC50m
2026-05-28 N53797 - May 28, 18:20 UTCMay 28, 19:20 UTC1h 0m
2026-05-27 N53797 CCB → CCB May 27, 20:35 UTCMay 27, 21:25 UTC50m
2026-05-26 N53797 CCB → CCB May 26, 19:25 UTCMay 26, 20:00 UTC35m
2026-05-26 N53797 CCB → CCB May 26, 00:00 UTCMay 26, 00:44 UTC45m
2026-05-25 N53797 - May 25, 22:30 UTCMay 25, 23:10 UTC40m
2026-05-25 N53797 CCB → CCB May 25, 18:05 UTCMay 25, 18:55 UTC50m
2026-05-24 N53797 CNO → CCB May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 N53797 CCB → CCB May 24, 19:25 UTCMay 24, 20:30 UTC1h 5m
2026-05-24 N53797 - May 24, 16:55 UTCMay 24, 17:50 UTC55m
2026-05-24 N53797 - May 24, 14:15 UTCMay 24, 15:10 UTC55m
2026-05-23 N53797 CCB → CCB May 23, 22:15 UTCMay 23, 23:25 UTC1h 10m
2026-05-23 N53797 CCB → CCB May 23, 19:25 UTCMay 23, 20:20 UTC55m
2026-05-23 N53797 CCB → CCB May 23, 17:30 UTCMay 23, 18:40 UTC1h 10m
2026-05-21 N53797 CCB → CCB May 21, 17:30 UTCMay 21, 18:15 UTC45m
2026-05-21 N53797 POC → CCB May 21, 15:10 UTCMay 21, 15:50 UTC40m
2026-05-20 N53797 - May 20, 22:05 UTCMay 20, 22:55 UTC50m
2026-05-20 N53797 CCB → OXR May 20, 20:05 UTCMay 20, 21:00 UTC55m
2026-05-20 N53797 CCB → CCB May 20, 14:50 UTCMay 20, 17:40 UTC2h 50m
2026-05-18 N53797 - May 18, 21:50 UTCMay 18, 22:25 UTC35m
2026-05-17 N53797 CCB → CCB May 17, 22:30 UTCMay 17, 23:35 UTC1h 5m
2026-05-17 N53797 CCB → CCB May 17, 19:40 UTCMay 17, 20:40 UTC1h 0m
2026-05-16 N53797 CCB → CCB May 16, 19:40 UTCMay 16, 20:50 UTC1h 10m
2026-05-16 N53797 - May 16, 00:25 UTCMay 16, 01:15 UTC50m
2026-05-15 N53797 CCB → CCB May 15, 21:40 UTCMay 15, 22:45 UTC1h 5m

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 N53797 page for operator, model, and routing details .

Mode-S A6CE21 frequently asked

What is Mode-S code A6CE21?
A6CE21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N53797.
Where is Mode-S A6CE21 registered?
Mode-S code A6CE21 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 A6CE21 broadcasting right now?
No active broadcast right now. Last signal was 7h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6CE21, octal 51547041, decimal 10,931,745.
What flights does A6CE21 operate?
Mode-S A6CE21 has broadcast 1 distinct callsign, including N53797.