Apparatus

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sensors Mode-S transponder

A9A2D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N72ST · CESSNA 172 Skyhawk · operated by SIERRA TANGO AIR LLC

Hex
A9A2D5
Octal
52321325
Decimal
11,117,269
Country
US
Tail
N72ST
Type
C172
No current signal · last broadcast Jul 15, 19:40 UTC
Flights observed
63
Distinct callsigns
1
Country
US
Last broadcast
Jul 15, 19:40 UTC

Last known position

Most recent position reported by Mode-S A9A2D5.

Country allocation

The ICAO 24-bit address A9A2D5 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
N72ST - 63 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 N72ST - Jul 15, 16:05 UTCJul 15, 19:40 UTC3h 35m
2026-07-15 N72ST - Jul 15, 12:25 UTCJul 15, 14:50 UTC2h 25m
2026-07-13 N72ST - Jul 13, 16:50 UTCJul 13, 18:10 UTC1h 20m
2026-07-13 N72ST - Jul 13, 13:05 UTCJul 13, 15:45 UTC2h 40m
2026-07-12 N72ST - Jul 12, 12:05 UTCJul 12, 14:10 UTC2h 5m
2026-07-09 N72ST - Jul 9, 01:30 UTCJul 9, 03:30 UTC2h 0m
2026-07-08 N72ST - Jul 8, 19:40 UTCJul 8, 20:40 UTC1h 0m
2026-07-08 N72ST - Jul 8, 15:25 UTCJul 8, 16:40 UTC1h 15m
2026-07-06 N72ST - Jul 6, 15:50 UTCJul 6, 17:30 UTC1h 40m
2026-07-04 N72ST - Jul 4, 18:55 UTCJul 4, 19:30 UTC35m
2026-07-03 N72ST - Jul 3, 18:15 UTCJul 3, 18:30 UTC15m
2026-07-03 N72ST - Jul 3, 16:45 UTCJul 3, 17:00 UTC15m
2026-07-02 N72ST - Jul 2, 19:45 UTCJul 2, 20:25 UTC40m
2026-07-02 N72ST - Jul 2, 16:30 UTCJul 2, 17:40 UTC1h 10m
2026-07-02 N72ST - Jul 2, 12:55 UTCJul 2, 14:30 UTC1h 35m
2026-06-30 N72ST - Jun 30, 16:40 UTCJun 30, 18:05 UTC1h 25m
2026-06-26 N72ST - Jun 26, 18:54 UTCJun 26, 19:20 UTC25m
2026-06-26 N72ST - Jun 26, 13:59 UTCJun 26, 16:20 UTC2h 20m
2026-06-25 N72ST - Jun 25, 17:14 UTCJun 25, 19:24 UTC2h 10m
2026-06-24 N72ST - Jun 24, 18:44 UTCJun 24, 19:15 UTC30m
2026-06-24 N72ST - Jun 24, 15:29 UTCJun 24, 15:54 UTC25m
2026-06-23 N72ST - Jun 23, 20:49 UTCJun 23, 21:14 UTC25m
2026-06-23 N72ST - Jun 23, 18:14 UTCJun 23, 19:15 UTC1h 0m
2026-06-23 N72ST - Jun 23, 16:50 UTCJun 23, 17:39 UTC50m
2026-06-21 N72ST - Jun 21, 16:25 UTCJun 21, 17:24 UTC1h 0m
2026-06-21 N72ST - Jun 21, 13:29 UTCJun 21, 15:54 UTC2h 25m
2026-06-20 N72ST - Jun 20, 20:05 UTCJun 20, 20:20 UTC15m
2026-06-20 N72ST - Jun 20, 10:34 UTCJun 20, 13:19 UTC2h 45m
2026-06-13 N72ST - Jun 13, 15:05 UTCJun 13, 17:35 UTC2h 30m
2026-06-13 N72ST - Jun 13, 13:45 UTCJun 13, 14:20 UTC35m
2026-06-10 N72ST - Jun 10, 17:50 UTCJun 10, 18:30 UTC40m
2026-06-05 N72ST - Jun 5, 18:25 UTCJun 5, 20:15 UTC1h 50m
2026-06-04 N72ST - Jun 4, 20:20 UTCJun 4, 21:55 UTC1h 35m
2026-06-04 N72ST - Jun 4, 14:55 UTCJun 4, 15:55 UTC1h 0m
2026-06-04 N72ST - Jun 4, 01:50 UTCJun 4, 03:10 UTC1h 20m
2026-06-03 N72ST - Jun 3, 22:05 UTCJun 3, 23:35 UTC1h 30m
2026-06-02 N72ST - Jun 2, 19:35 UTCJun 2, 20:35 UTC1h 0m
2026-05-28 N72ST - May 28, 21:40 UTCMay 28, 22:30 UTC50m
2026-05-28 N72ST - May 28, 19:10 UTCMay 28, 20:10 UTC1h 0m
2026-05-27 N72ST - May 27, 17:30 UTCMay 27, 18:05 UTC35m
2026-05-14 N72ST - May 14, 21:05 UTCMay 14, 21:35 UTC30m
2026-05-14 N72ST - May 14, 15:10 UTCMay 14, 15:50 UTC40m
2026-05-13 N72ST - May 13, 18:05 UTCMay 13, 18:35 UTC30m
2026-05-13 N72ST - May 13, 15:40 UTCMay 13, 16:10 UTC30m
2026-05-11 N72ST - May 11, 17:10 UTCMay 11, 18:00 UTC50m
2026-05-11 N72ST - May 11, 14:35 UTCMay 11, 15:15 UTC40m
2026-05-05 N72ST - May 5, 19:00 UTCMay 5, 20:30 UTC1h 30m
2026-04-30 N72ST - Apr 30, 00:00 UTCApr 30, 00:20 UTC20m
2026-04-29 N72ST - Apr 29, 21:00 UTCApr 29, 22:20 UTC1h 20m
2026-04-27 N72ST - Apr 27, 17:05 UTCApr 27, 18:35 UTC1h 30m

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 N72ST page for operator, model, and routing details .

Mode-S A9A2D5 frequently asked

What is Mode-S code A9A2D5?
A9A2D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N72ST.
Where is Mode-S A9A2D5 registered?
Mode-S code A9A2D5 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 A9A2D5 broadcasting right now?
No active broadcast right now. Last signal was Jul 15, 19:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9A2D5, octal 52321325, decimal 11,117,269.
What flights does A9A2D5 operate?
Mode-S A9A2D5 has broadcast 1 distinct callsign, including N72ST.