Apparatus

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sensors Mode-S transponder

A9A2B4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N72RK · CESSNA T206 Turbo Stationair · operated by AERIAL SERVICES INC

Hex
A9A2B4
Octal
52321264
Decimal
11,117,236
Country
US
Tail
N72RK
Type
T206
No current signal · last broadcast Jun 11, 16:55 UTC
Flights observed
92
Distinct callsigns
1
Country
US
Last broadcast
Jun 11, 16:55 UTC

Last known position

Most recent position reported by Mode-S A9A2B4.

Country allocation

The ICAO 24-bit address A9A2B4 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
N72RK - 91 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-11 N72RK - Jun 11, 13:10 UTCJun 11, 16:55 UTC3h 45m
2026-06-11 N72RK - Jun 11, 05:35 UTCJun 11, 06:25 UTC50m
2026-06-11 N72RK - Jun 11, 02:10 UTCJun 11, 04:50 UTC2h 40m
2026-06-10 N72RK - Jun 10, 22:10 UTCJun 11, 01:25 UTC3h 15m
2026-06-10 N72RK - Jun 10, 16:20 UTCJun 10, 18:10 UTC1h 50m
2026-06-09 N72RK - Jun 9, 16:45 UTCJun 9, 17:05 UTC20m
2026-06-09 N72RK - Jun 9, 12:10 UTCJun 9, 15:50 UTC3h 40m
2026-06-08 N72RK - Jun 8, 17:45 UTCJun 8, 21:45 UTC4h 0m
2026-06-08 N72RK - Jun 8, 12:40 UTCJun 8, 16:50 UTC4h 10m
2026-06-07 N72RK - Jun 7, 17:00 UTCJun 7, 17:15 UTC15m
2026-06-07 N72RK - Jun 7, 12:10 UTCJun 7, 16:05 UTC3h 55m
2026-06-06 N72RK - Jun 6, 18:00 UTCJun 6, 21:04 UTC3h 5m
2026-06-06 N72RK - Jun 6, 11:55 UTCJun 6, 17:00 UTC5h 5m
2026-06-05 N72RK - Jun 5, 17:45 UTCJun 5, 21:35 UTC3h 50m
2026-06-05 N72RK - Jun 5, 12:15 UTCJun 5, 16:45 UTC4h 30m
2026-06-04 N72RK - Jun 4, 19:50 UTCJun 4, 21:50 UTC2h 0m
2026-06-04 N72RK - Jun 4, 12:15 UTCJun 4, 13:25 UTC1h 10m
2026-06-03 N72RK - Jun 3, 23:35 UTCJun 3, 23:45 UTC10m
2026-06-03 N72RK - Jun 3, 18:05 UTCJun 3, 21:50 UTC3h 45m
2026-06-03 N72RK - Jun 3, 12:25 UTCJun 3, 17:20 UTC4h 55m
2026-06-02 N72RK - Jun 2, 17:10 UTCJun 2, 22:30 UTC5h 20m
2026-06-02 N72RK - Jun 2, 12:40 UTCJun 2, 16:25 UTC3h 45m
2026-06-01 N72RK - Jun 1, 18:10 UTCJun 1, 22:10 UTC4h 0m
2026-06-01 N72RK - Jun 1, 12:55 UTCJun 1, 17:20 UTC4h 25m
2026-05-31 N72RK - May 31, 12:15 UTCMay 31, 20:20 UTC8h 5m
2026-05-30 N72RK - May 30, 23:30 UTCMay 31, 01:11 UTC1h 41m
2026-05-30 N72RK - May 30, 22:35 UTCMay 30, 23:00 UTC25m
2026-05-30 N72RK - May 30, 20:10 UTCMay 30, 21:10 UTC1h 0m
2026-05-30 N72RK - May 30, 11:50 UTCMay 30, 16:20 UTC4h 30m
2026-05-29 N72RK - May 29, 15:40 UTCMay 29, 19:00 UTC3h 20m
2026-05-29 N72RK - May 29, 14:45 UTCMay 29, 15:00 UTC15m
2026-05-29 N72RK - May 29, 11:25 UTCMay 29, 13:00 UTC1h 35m
2026-05-28 N72RK - May 28, 15:50 UTCMay 28, 19:05 UTC3h 15m
2026-05-27 N72RK - May 27, 17:00 UTCMay 27, 18:10 UTC1h 10m
2026-05-26 N72RK - May 26, 17:04 UTCMay 26, 17:20 UTC15m
2026-05-25 N72RK - May 25, 22:40 UTCMay 25, 23:14 UTC35m
2026-05-25 N72RK - May 25, 14:25 UTCMay 25, 16:00 UTC1h 35m
2026-05-24 N72RK - May 24, 23:00 UTCMay 24, 23:46 UTC46m
2026-05-24 N72RK - May 24, 21:00 UTCMay 24, 21:45 UTC45m
2026-05-24 N72RK - May 24, 19:55 UTCMay 24, 20:30 UTC35m
2026-05-24 N72RK - May 24, 00:30 UTCMay 24, 00:50 UTC20m
2026-05-23 N72RK - May 23, 22:30 UTCMay 23, 22:45 UTC15m
2026-05-19 N72RK - May 19, 21:35 UTCMay 19, 22:00 UTC25m
2026-05-19 N72RK - May 19, 18:30 UTCMay 19, 20:30 UTC2h 0m
2026-05-19 N72RK - May 19, 03:45 UTCMay 19, 04:15 UTC30m
2026-05-17 N72RK - May 17, 14:10 UTCMay 17, 14:40 UTC30m
2026-05-16 N72RK - May 16, 19:30 UTCMay 16, 21:15 UTC1h 45m
2026-05-16 N72RK - May 16, 14:46 UTCMay 16, 17:40 UTC2h 55m
2026-05-16 N72RK - May 16, 02:20 UTCMay 16, 02:40 UTC20m
2026-05-15 N72RK - May 15, 22:20 UTCMay 16, 00:15 UTC1h 55m

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 N72RK page for operator, model, and routing details .

Mode-S A9A2B4 frequently asked

What is Mode-S code A9A2B4?
A9A2B4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N72RK.
Where is Mode-S A9A2B4 registered?
Mode-S code A9A2B4 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 A9A2B4 broadcasting right now?
No active broadcast right now. Last signal was Jun 11, 16:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9A2B4, octal 52321264, decimal 11,117,236.
What flights does A9A2B4 operate?
Mode-S A9A2B4 has broadcast 1 distinct callsign, including N72RK.