Apparatus

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sensors Mode-S transponder

A6FBDF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N5491J · CESSNA 172 Skyhawk · operated by CHRISTIANSEN AVIATION LLC

Hex
A6FBDF
Octal
51575737
Decimal
10,943,455
Country
US
Tail
N5491J
Type
C172
No current signal · last broadcast 28d ago
Flights observed
68
Distinct callsigns
1
Country
US
Last broadcast
28d ago

Last known position

Most recent position reported by Mode-S A6FBDF.

Country allocation

The ICAO 24-bit address A6FBDF 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
N5491J - 67 2026-07-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-06 N5491J - Jul 6, 17:10 UTCJul 6, 17:45 UTC35m
2026-07-06 N5491J - Jul 6, 14:30 UTCJul 6, 15:55 UTC1h 25m
2026-07-04 N5491J - Jul 4, 16:15 UTCJul 4, 16:25 UTC10m
2026-07-04 N5491J - Jul 4, 14:35 UTCJul 4, 14:55 UTC20m
2026-07-03 N5491J - Jul 3, 14:00 UTCJul 3, 15:15 UTC1h 15m
2026-07-02 N5491J - Jul 2, 14:10 UTCJul 2, 15:20 UTC1h 10m
2026-07-01 N5491J - Jul 1, 18:55 UTCJul 1, 20:05 UTC1h 10m
2026-07-01 N5491J - Jul 1, 14:30 UTCJul 1, 15:55 UTC1h 25m
2026-07-01 N5491J - Jul 1, 12:40 UTCJul 1, 13:20 UTC40m
2026-06-30 N5491J - Jun 30, 17:25 UTCJun 30, 17:55 UTC30m
2026-06-29 N5491J - Jun 29, 16:59 UTCJun 29, 18:55 UTC1h 55m
2026-06-29 N5491J GJT → GJT Jun 29, 14:34 UTCJun 29, 15:34 UTC1h 0m
2026-06-26 N5491J - Jun 26, 16:44 UTCJun 26, 18:15 UTC1h 30m
2026-06-26 N5491J - Jun 26, 14:15 UTCJun 26, 15:15 UTC1h 0m
2026-06-25 N5491J - Jun 25, 16:35 UTCJun 25, 16:50 UTC15m
2026-06-23 N5491J - Jun 23, 19:19 UTCJun 23, 19:34 UTC15m
2026-06-23 N5491J - Jun 23, 18:10 UTCJun 23, 18:20 UTC10m
2026-06-23 N5491J - Jun 23, 13:45 UTCJun 23, 14:39 UTC55m
2026-06-23 N5491J - Jun 23, 03:20 UTCJun 23, 04:25 UTC1h 5m
2026-06-22 N5491J - Jun 22, 18:54 UTCJun 22, 19:05 UTC10m
2026-06-22 N5491J - Jun 22, 17:29 UTCJun 22, 17:44 UTC15m
2026-06-22 N5491J - Jun 22, 15:20 UTCJun 22, 15:45 UTC25m
2026-06-19 N5491J - Jun 19, 19:34 UTCJun 19, 19:45 UTC10m
2026-06-19 N5491J - Jun 19, 16:34 UTCJun 19, 18:05 UTC1h 30m
2026-06-19 N5491J - Jun 19, 13:50 UTCJun 19, 15:04 UTC1h 15m
2026-06-16 N5491J - Jun 16, 16:55 UTCJun 16, 17:19 UTC25m
2026-06-15 N5491J - Jun 15, 16:55 UTCJun 15, 18:10 UTC1h 15m
2026-06-12 N5491J - Jun 12, 14:20 UTCJun 12, 14:50 UTC30m
2026-06-11 N5491J - Jun 11, 17:25 UTCJun 11, 17:45 UTC20m
2026-06-10 N5491J - Jun 10, 17:05 UTCJun 10, 17:55 UTC50m
2026-06-08 N5491J - Jun 8, 14:45 UTCJun 8, 14:55 UTC10m
2026-06-08 N5491J - Jun 8, 13:20 UTCJun 8, 13:30 UTC10m
2026-06-08 N5491J - Jun 8, 12:10 UTCJun 8, 12:30 UTC20m
2026-06-07 N5491J - Jun 7, 05:00 UTCJun 7, 05:15 UTC15m
2026-06-07 N5491J - Jun 7, 03:40 UTCJun 7, 04:05 UTC25m
2026-06-06 N5491J - Jun 6, 05:55 UTCJun 6, 06:20 UTC25m
2026-06-06 N5491J - Jun 6, 03:55 UTCJun 6, 04:15 UTC20m
2026-06-05 N5491J - Jun 5, 23:45 UTCJun 6, 00:00 UTC15m
2026-06-05 N5491J - Jun 5, 21:05 UTCJun 5, 21:20 UTC15m
2026-06-03 N5491J - Jun 3, 20:10 UTCJun 3, 20:20 UTC10m
2026-06-03 N5491J - Jun 3, 14:45 UTCJun 3, 15:00 UTC15m
2026-06-02 N5491J - Jun 2, 17:15 UTCJun 2, 17:25 UTC10m
2026-06-02 N5491J - Jun 2, 15:10 UTCJun 2, 15:30 UTC20m
2026-06-02 N5491J - Jun 2, 04:45 UTCJun 2, 04:55 UTC10m
2026-06-02 N5491J - Jun 2, 03:30 UTCJun 2, 03:40 UTC10m
2026-05-21 N5491J - May 21, 18:20 UTCMay 21, 18:35 UTC15m
2026-05-21 N5491J - May 21, 16:45 UTCMay 21, 16:55 UTC10m
2026-05-20 N5491J - May 20, 04:20 UTCMay 20, 04:30 UTC10m
2026-05-20 N5491J - May 20, 03:00 UTCMay 20, 03:20 UTC20m
2026-05-13 N5491J - May 13, 15:45 UTCMay 13, 16:05 UTC20m

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 N5491J page for operator, model, and routing details .

Mode-S A6FBDF frequently asked

What is Mode-S code A6FBDF?
A6FBDF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N5491J.
Where is Mode-S A6FBDF registered?
Mode-S code A6FBDF 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 A6FBDF broadcasting right now?
No active broadcast right now. Last signal was 28d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6FBDF, octal 51575737, decimal 10,943,455.
What flights does A6FBDF operate?
Mode-S A6FBDF has broadcast 1 distinct callsign, including N5491J.