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sensors Mode-S transponder

A6977A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N52371 · CESSNA 172 Skyhawk · operated by HILLSBORO AERO ACADEMY LLC

Hex
A6977A
Octal
51513572
Decimal
10,917,754
Country
US
Tail
N52371
Type
C172
No current signal · last broadcast 16h ago
Flights observed
256
Distinct callsigns
1
Country
US
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S A6977A.

Country allocation

The ICAO 24-bit address A6977A 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
N52371 - 256 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N52371 - Jul 13, 17:05 UTCJul 13, 18:35 UTC1h 30m
2026-07-13 N52371 - Jul 13, 14:35 UTCJul 13, 16:00 UTC1h 25m
2026-07-12 N52371 - Jul 12, 19:40 UTCJul 12, 21:10 UTC1h 30m
2026-07-12 N52371 - Jul 12, 17:01 UTCJul 12, 17:20 UTC20m
2026-07-12 N52371 - Jul 12, 15:35 UTCJul 12, 16:30 UTC55m
2026-07-11 N52371 - Jul 11, 21:00 UTCJul 11, 21:30 UTC30m
2026-07-11 N52371 - Jul 11, 18:20 UTCJul 11, 18:40 UTC20m
2026-07-11 N52371 - Jul 11, 17:10 UTCJul 11, 17:25 UTC15m
2026-07-11 N52371 - Jul 11, 15:50 UTCJul 11, 16:10 UTC20m
2026-07-11 N52371 - Jul 11, 14:20 UTCJul 11, 15:10 UTC50m
2026-07-11 N52371 - Jul 11, 01:35 UTCJul 11, 02:35 UTC1h 0m
2026-07-10 N52371 - Jul 10, 22:00 UTCJul 10, 23:20 UTC1h 20m
2026-07-10 N52371 - Jul 10, 19:35 UTCJul 10, 20:50 UTC1h 15m
2026-07-10 N52371 - Jul 10, 16:25 UTCJul 10, 18:10 UTC1h 45m
2026-07-10 N52371 - Jul 10, 14:35 UTCJul 10, 14:50 UTC15m
2026-07-10 N52371 - Jul 10, 13:30 UTCJul 10, 13:45 UTC15m
2026-07-10 N52371 - Jul 10, 01:25 UTCJul 10, 02:30 UTC1h 5m
2026-07-09 N52371 - Jul 9, 22:30 UTCJul 9, 23:45 UTC1h 15m
2026-07-09 N52371 RDM → RDM Jul 9, 15:55 UTCJul 9, 17:25 UTC1h 30m
2026-07-09 N52371 - Jul 9, 13:20 UTCJul 9, 14:40 UTC1h 20m
2026-07-08 N52371 - Jul 8, 20:05 UTCJul 8, 20:45 UTC40m
2026-07-08 N52371 - Jul 8, 17:45 UTCJul 8, 19:00 UTC1h 15m
2026-07-08 N52371 - Jul 8, 14:15 UTCJul 8, 15:35 UTC1h 20m
2026-07-08 N52371 - Jul 8, 02:45 UTCJul 8, 03:35 UTC50m
2026-07-07 N52371 - Jul 7, 21:50 UTCJul 7, 22:50 UTC1h 0m
2026-07-07 N52371 - Jul 7, 18:00 UTCJul 7, 18:10 UTC10m
2026-07-07 N52371 - Jul 7, 16:20 UTCJul 7, 16:40 UTC20m
2026-07-06 N52371 - Jul 6, 17:35 UTCJul 6, 18:55 UTC1h 20m
2026-07-06 N52371 - Jul 6, 15:10 UTCJul 6, 16:35 UTC1h 25m
2026-07-06 N52371 - Jul 6, 12:40 UTCJul 6, 14:05 UTC1h 25m
2026-07-05 N52371 - Jul 5, 19:45 UTCJul 5, 21:05 UTC1h 20m
2026-07-05 N52371 RDM → RDM Jul 5, 14:55 UTCJul 5, 16:10 UTC1h 15m
2026-07-05 N52371 - Jul 5, 05:05 UTCJul 5, 06:10 UTC1h 5m
2026-07-04 N52371 - Jul 4, 20:15 UTCJul 4, 20:25 UTC10m
2026-07-04 N52371 RDM → RDM Jul 4, 14:35 UTCJul 4, 16:15 UTC1h 40m
2026-07-01 N52371 - Jul 1, 21:25 UTCJul 1, 22:00 UTC35m
2026-07-01 N52371 - Jul 1, 18:40 UTCJul 1, 19:50 UTC1h 10m
2026-07-01 N52371 RDM → RDM Jul 1, 15:20 UTCJul 1, 16:35 UTC1h 15m
2026-07-01 N52371 - Jul 1, 02:25 UTCJul 1, 04:20 UTC1h 55m
2026-06-30 N52371 - Jun 30, 23:15 UTCJul 1, 00:50 UTC1h 35m
2026-06-30 N52371 - Jun 30, 17:25 UTCJun 30, 18:40 UTC1h 15m
2026-06-30 N52371 RDM → RDM Jun 30, 12:30 UTCJun 30, 13:30 UTC1h 0m
2026-06-30 N52371 - Jun 30, 01:40 UTCJun 30, 02:50 UTC1h 10m
2026-06-29 N52371 - Jun 29, 22:55 UTCJun 29, 23:54 UTC1h 0m
2026-06-29 N52371 - Jun 29, 19:44 UTCJun 29, 21:05 UTC1h 20m
2026-06-29 N52371 - Jun 29, 15:45 UTCJun 29, 16:19 UTC35m
2026-06-29 N52371 - Jun 29, 14:44 UTCJun 29, 15:14 UTC30m
2026-06-28 N52371 - Jun 28, 22:49 UTCJun 29, 00:05 UTC1h 15m
2026-06-27 N52371 - Jun 27, 17:04 UTCJun 27, 18:35 UTC1h 30m
2026-06-25 N52371 - Jun 25, 19:39 UTCJun 25, 21:05 UTC1h 25m

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 N52371 page for operator, model, and routing details .

Mode-S A6977A frequently asked

What is Mode-S code A6977A?
A6977A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N52371.
Where is Mode-S A6977A registered?
Mode-S code A6977A 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 A6977A broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6977A, octal 51513572, decimal 10,917,754.
What flights does A6977A operate?
Mode-S A6977A has broadcast 1 distinct callsign, including N52371.