Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 25, 19:05 UTC
Flights observed
280
Distinct callsigns
1
Country
US
Last broadcast
Jul 25, 19:05 UTC

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 - 280 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 N52371 - Jul 25, 18:10 UTCJul 25, 19:05 UTC55m
2026-07-25 N52371 - Jul 25, 15:30 UTCJul 25, 16:50 UTC1h 20m
2026-07-25 N52371 RDM → RDM Jul 25, 13:30 UTCJul 25, 14:40 UTC1h 10m
2026-07-24 N52371 - Jul 24, 23:45 UTCJul 25, 00:30 UTC45m
2026-07-22 N52371 - Jul 22, 15:20 UTCJul 22, 16:40 UTC1h 20m
2026-07-20 N52371 RDM → RDM Jul 20, 19:25 UTCJul 20, 21:05 UTC1h 40m
2026-07-19 N52371 - Jul 19, 22:45 UTCJul 19, 23:25 UTC40m
2026-07-19 N52371 RDM → RDM Jul 19, 17:40 UTCJul 19, 18:55 UTC1h 15m
2026-07-18 N52371 - Jul 18, 19:20 UTCJul 18, 20:45 UTC1h 25m
2026-07-18 N52371 - Jul 18, 15:00 UTCJul 18, 16:15 UTC1h 15m
2026-07-17 N52371 - Jul 17, 18:44 UTCJul 17, 20:15 UTC1h 30m
2026-07-17 N52371 - Jul 17, 16:24 UTCJul 17, 17:35 UTC1h 10m
2026-07-17 N52371 - Jul 17, 13:29 UTCJul 17, 14:50 UTC1h 20m
2026-07-16 N52371 - Jul 16, 20:00 UTCJul 16, 20:25 UTC25m
2026-07-16 N52371 - Jul 16, 18:44 UTCJul 16, 19:25 UTC40m
2026-07-16 N52371 - Jul 16, 16:44 UTCJul 16, 17:20 UTC35m
2026-07-16 N52371 - Jul 16, 13:49 UTCJul 16, 15:00 UTC1h 10m
2026-07-15 N52371 - Jul 15, 18:20 UTCJul 15, 18:35 UTC15m
2026-07-15 N52371 - Jul 15, 16:50 UTCJul 15, 17:20 UTC30m
2026-07-15 N52371 - Jul 15, 14:25 UTCJul 15, 15:50 UTC1h 25m
2026-07-14 N52371 - Jul 14, 23:35 UTCJul 15, 01:05 UTC1h 30m
2026-07-14 N52371 - Jul 14, 19:20 UTCJul 14, 20:50 UTC1h 30m
2026-07-14 N52371 - Jul 14, 16:25 UTCJul 14, 16:55 UTC30m
2026-07-14 N52371 RDM → PRZ Jul 14, 15:30 UTCJul 14, 15:40 UTC10m
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

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 Jul 25, 19:05 UTC.
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.