Apparatus

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sensors Mode-S transponder

A89B7A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N6539H · CESSNA 172 Skyhawk · operated by ABOVE THE HAZE LLC

Hex
A89B7A
Octal
52115572
Decimal
11,049,850
Country
US
Tail
N6539H
Type
C172
No current signal · last broadcast 5h ago
Flights observed
46
Distinct callsigns
1
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A89B7A.

Country allocation

The ICAO 24-bit address A89B7A 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
N6539H - 46 2026-05-29

Recent flights last 46

DateFlightRouteTakeoffLandingDuration
2026-05-29 N6539H RHV → RHV May 29, 17:55 UTCMay 29, 18:45 UTC50m
2026-05-29 N6539H HWD → RHV May 29, 05:05 UTCMay 29, 05:25 UTC20m
2026-05-14 N6539H HWD → HWD May 14, 16:15 UTCMay 14, 16:20 UTC5m
2026-05-14 N6539H HWD → HWD May 14, 15:35 UTCMay 14, 16:05 UTC30m
2026-05-14 N6539H HWD → HWD May 14, 00:30 UTCMay 14, 01:40 UTC1h 10m
2026-05-13 N6539H HWD → HWD May 13, 17:55 UTCMay 13, 18:00 UTC5m
2026-05-13 N6539H HWD → HWD May 13, 17:25 UTCMay 13, 17:45 UTC20m
2026-05-12 N6539H HWD → HWD May 12, 20:35 UTCMay 12, 21:30 UTC55m
2026-05-11 N6539H HWD → HWD May 11, 20:45 UTCMay 11, 21:35 UTC50m
2026-05-11 N6539H - May 11, 19:10 UTCMay 11, 19:55 UTC45m
2026-05-11 N6539H - May 11, 18:15 UTCMay 11, 18:55 UTC40m
2026-05-10 N6539H HWD → HWD May 10, 21:44 UTCMay 10, 22:45 UTC1h 0m
2026-05-10 N6539H HWD → HWD May 10, 19:15 UTCMay 10, 20:00 UTC45m
2026-05-10 N6539H HWD → HWD May 10, 18:55 UTCMay 10, 19:05 UTC10m
2026-05-09 N6539H HWD → HWD May 9, 21:50 UTCMay 9, 22:05 UTC15m
2026-05-09 N6539H - May 9, 03:00 UTCMay 9, 03:30 UTC30m
2026-05-09 N6539H - May 9, 02:00 UTCMay 9, 02:55 UTC55m
2026-05-08 N6539H HWD → HWD May 8, 21:20 UTCMay 8, 21:50 UTC30m
2026-05-07 N6539H HWD → HWD May 7, 02:20 UTCMay 7, 03:20 UTC1h 0m
2026-05-06 N6539H HWD → HWD May 6, 21:45 UTCMay 6, 23:55 UTC2h 10m
2026-05-04 N6539H HWD → HWD May 4, 23:30 UTCMay 5, 00:25 UTC55m
2026-05-04 N6539H HWD → HWD May 4, 18:30 UTCMay 4, 19:20 UTC51m
2026-05-04 N6539H HWD → HWD May 4, 15:35 UTCMay 4, 17:20 UTC1h 45m
2026-05-02 N6539H HWD → HWD May 2, 17:35 UTCMay 2, 17:45 UTC10m
2026-05-02 N6539H HWD → HWD May 2, 17:20 UTCMay 2, 17:30 UTC10m
2026-05-02 N6539H HWD → HWD May 2, 16:10 UTCMay 2, 16:50 UTC40m
2026-05-02 N6539H HWD → HWD May 2, 01:35 UTCMay 2, 02:15 UTC40m
2026-05-02 N6539H HWD → HWD May 2, 01:20 UTCMay 2, 01:30 UTC10m
2026-05-01 N6539H HWD → HWD May 1, 21:35 UTCMay 1, 22:15 UTC40m
2026-05-01 N6539H HWD → HWD May 1, 01:45 UTCMay 1, 03:15 UTC1h 30m
2026-04-30 N6539H HWD → HWD Apr 30, 20:40 UTCApr 30, 22:15 UTC1h 35m
2026-04-30 N6539H HWD → HWD Apr 30, 19:15 UTCApr 30, 19:45 UTC30m
2026-04-30 N6539H HWD → HWD Apr 30, 19:00 UTCApr 30, 19:10 UTC10m
2026-04-30 N6539H HWD → HWD Apr 30, 15:45 UTCApr 30, 16:15 UTC30m
2026-04-30 N6539H HWD → HWD Apr 30, 00:40 UTCApr 30, 01:20 UTC40m
2026-04-29 N6539H HWD → HWD Apr 29, 04:05 UTCApr 29, 04:20 UTC15m
2026-04-28 N6539H HWD → HWD Apr 28, 23:45 UTCApr 29, 00:54 UTC1h 10m
2026-04-28 N6539H HWD → HWD Apr 28, 20:55 UTCApr 28, 22:35 UTC1h 40m
2026-04-28 N6539H HWD → HWD Apr 28, 15:35 UTCApr 28, 16:30 UTC55m
2026-04-28 N6539H HWD → HWD Apr 28, 03:15 UTCApr 28, 05:10 UTC1h 55m
2026-04-27 N6539H HWD → HWD Apr 27, 21:50 UTCApr 27, 22:10 UTC20m
2026-04-27 N6539H HWD → HWD Apr 27, 21:10 UTCApr 27, 21:45 UTC35m
2026-04-26 N6539H HWD → HWD Apr 26, 22:30 UTCApr 26, 23:00 UTC30m
2026-04-25 N6539H HWD → HWD Apr 25, 19:30 UTCApr 25, 20:25 UTC55m
2026-04-24 N6539H HWD → HWD Apr 24, 21:15 UTCApr 24, 21:20 UTC5m
2026-04-17 N6539H HWD → HWD Apr 17, 21:40 UTCApr 17, 21:50 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 N6539H page for operator, model, and routing details .

Mode-S A89B7A frequently asked

What is Mode-S code A89B7A?
A89B7A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N6539H.
Where is Mode-S A89B7A registered?
Mode-S code A89B7A 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 A89B7A broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A89B7A, octal 52115572, decimal 11,049,850.
What flights does A89B7A operate?
Mode-S A89B7A has broadcast 1 distinct callsign, including N6539H.