Apparatus

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sensors Mode-S transponder

A6F31D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N547ND · CESSNA 172 Skyhawk · operated by SPARTAN EDUCATION LLC

Hex
A6F31D
Octal
51571435
Decimal
10,941,213
Country
US
Tail
N547ND
Type
C172
No current signal · last broadcast 5d ago
Flights observed
78
Distinct callsigns
1
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A6F31D.

Country allocation

The ICAO 24-bit address A6F31D 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
N547ND - 78 2026-05-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-24 N547ND BJC → BJC May 24, 15:20 UTCMay 24, 17:25 UTC2h 5m
2026-05-23 N547ND BJC → BJC May 23, 14:50 UTCMay 23, 16:30 UTC1h 40m
2026-05-22 N547ND BJC → BJC May 22, 22:35 UTCMay 22, 23:50 UTC1h 15m
2026-05-22 N547ND BJC → BJC May 22, 17:35 UTCMay 22, 18:50 UTC1h 15m
2026-05-22 N547ND - May 22, 16:00 UTCMay 22, 16:15 UTC15m
2026-05-22 N547ND - May 22, 14:50 UTCMay 22, 15:55 UTC1h 5m
2026-05-21 N547ND BJC → BJC May 21, 20:45 UTCMay 21, 22:05 UTC1h 20m
2026-05-21 N547ND BJC → BJC May 21, 17:55 UTCMay 21, 19:20 UTC1h 25m
2026-05-21 N547ND BJC → BJC May 21, 15:10 UTCMay 21, 15:50 UTC40m
2026-05-20 N547ND BJC → BJC May 20, 15:15 UTCMay 20, 17:05 UTC1h 50m
2026-05-13 N547ND BJC → BJC May 13, 14:00 UTCMay 13, 14:55 UTC55m
2026-05-12 N547ND BJC → BJC May 12, 22:25 UTCMay 12, 23:45 UTC1h 20m
2026-05-12 N547ND BJC → BJC May 12, 13:35 UTCMay 12, 15:20 UTC1h 45m
2026-05-12 N547ND BJC → BJC May 12, 02:55 UTCMay 12, 04:30 UTC1h 35m
2026-05-11 N547ND BJC → BJC May 11, 18:35 UTCMay 11, 20:15 UTC1h 40m
2026-05-11 N547ND BJC → BJC May 11, 15:55 UTCMay 11, 16:55 UTC1h 0m
2026-05-11 N547ND BJC → BJC May 11, 13:20 UTCMay 11, 14:30 UTC1h 10m
2026-05-10 N547ND BJC → BJC May 10, 20:35 UTCMay 10, 22:09 UTC1h 35m
2026-05-10 N547ND BJC → BJC May 10, 17:49 UTCMay 10, 19:40 UTC1h 50m
2026-05-09 N547ND BJC → BJC May 9, 17:25 UTCMay 9, 18:35 UTC1h 10m
2026-05-09 N547ND BJC → BJC May 9, 14:25 UTCMay 9, 15:10 UTC45m
2026-05-08 N547ND BJC → BJC May 8, 19:25 UTCMay 8, 20:30 UTC1h 5m
2026-05-08 N547ND BJC → BJC May 8, 16:35 UTCMay 8, 17:20 UTC45m
2026-05-08 N547ND BJC → BJC May 8, 13:40 UTCMay 8, 14:15 UTC35m
2026-05-07 N547ND BJC → BJC May 7, 22:45 UTCMay 8, 00:20 UTC1h 35m
2026-05-07 N547ND PUB → BJC May 7, 19:15 UTCMay 7, 20:30 UTC1h 15m
2026-05-07 N547ND BJC → PUB May 7, 17:05 UTCMay 7, 18:15 UTC1h 10m
2026-05-07 N547ND - May 7, 14:40 UTCMay 7, 14:55 UTC15m
2026-05-07 N547ND - May 7, 13:30 UTCMay 7, 14:35 UTC1h 5m
2026-05-04 N547ND BJC → BJC May 4, 16:20 UTCMay 4, 17:50 UTC1h 30m
2026-05-03 N547ND BJC → BJC May 3, 19:05 UTCMay 3, 20:25 UTC1h 20m
2026-05-03 N547ND BJC → BJC May 3, 16:34 UTCMay 3, 18:09 UTC1h 35m
2026-05-03 N547ND BJC → BJC May 3, 13:35 UTCMay 3, 15:00 UTC1h 25m
2026-05-02 N547ND BJC → BJC May 2, 15:05 UTCMay 2, 16:20 UTC1h 15m
2026-05-01 N547ND BJC → BJC May 1, 18:50 UTCMay 1, 20:00 UTC1h 10m
2026-04-30 N547ND BJC → BJC Apr 30, 19:40 UTCApr 30, 20:30 UTC50m
2026-04-29 N547ND BJC → BJC Apr 29, 18:30 UTCApr 29, 19:25 UTC55m
2026-04-29 N547ND BJC → BJC Apr 29, 16:10 UTCApr 29, 16:45 UTC35m
2026-04-28 N547ND BJC → BJC Apr 28, 21:19 UTCApr 28, 22:25 UTC1h 5m
2026-04-25 N547ND BJC → BJC Apr 25, 19:45 UTCApr 25, 20:30 UTC45m
2026-04-24 N547ND BJC → BJC Apr 24, 19:20 UTCApr 24, 20:05 UTC45m
2026-04-24 N547ND BJC → BJC Apr 24, 16:55 UTCApr 24, 18:10 UTC1h 15m
2026-04-24 N547ND BJC → BJC Apr 24, 14:45 UTCApr 24, 15:45 UTC1h 0m
2026-04-23 N547ND BJC → BJC Apr 23, 20:40 UTCApr 23, 22:05 UTC1h 25m
2026-04-23 N547ND BJC → BJC Apr 23, 13:50 UTCApr 23, 15:00 UTC1h 10m
2026-04-22 N547ND BJC → BJC Apr 22, 19:25 UTCApr 22, 19:30 UTC5m
2026-04-22 N547ND BJC → BJC Apr 22, 18:55 UTCApr 22, 19:00 UTC6m
2026-04-22 N547ND BJC → BJC Apr 22, 16:20 UTCApr 22, 18:00 UTC1h 40m
2026-04-21 N547ND - Apr 21, 20:35 UTCApr 21, 21:15 UTC40m
2026-04-21 N547ND BJC → BJC Apr 21, 20:05 UTCApr 21, 20:30 UTC25m

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 N547ND page for operator, model, and routing details .

Mode-S A6F31D frequently asked

What is Mode-S code A6F31D?
A6F31D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N547ND.
Where is Mode-S A6F31D registered?
Mode-S code A6F31D 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 A6F31D broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6F31D, octal 51571435, decimal 10,941,213.
What flights does A6F31D operate?
Mode-S A6F31D has broadcast 1 distinct callsign, including N547ND.