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sensors Mode-S transponder

A9A3C9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N720CL · BELL 407 · operated by QWEST CORP

Hex
A9A3C9
Octal
52321711
Decimal
11,117,513
Country
US
Tail
N720CL
Type
B407
No current signal · last broadcast 14h ago
Flights observed
88
Distinct callsigns
1
Country
US
Last broadcast
14h ago

Last known position

Most recent position reported by Mode-S A9A3C9.

Country allocation

The ICAO 24-bit address A9A3C9 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
N720CL - 88 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N720CL - Jul 13, 18:25 UTCJul 13, 18:50 UTC25m
2026-07-13 N720CL - Jul 13, 14:20 UTCJul 13, 14:35 UTC15m
2026-07-09 N720CL - Jul 9, 18:40 UTCJul 9, 18:55 UTC15m
2026-07-09 N720CL - Jul 9, 17:10 UTCJul 9, 17:25 UTC15m
2026-07-09 N720CL - Jul 9, 14:15 UTCJul 9, 14:35 UTC20m
2026-07-08 N720CL - Jul 8, 18:50 UTCJul 8, 19:05 UTC15m
2026-07-08 N720CL - Jul 8, 17:00 UTCJul 8, 17:10 UTC10m
2026-07-08 N720CL - Jul 8, 13:50 UTCJul 8, 14:20 UTC30m
2026-07-07 N720CL - Jul 7, 18:30 UTCJul 7, 18:45 UTC15m
2026-07-07 N720CL - Jul 7, 14:15 UTCJul 7, 14:30 UTC15m
2026-07-06 N720CL - Jul 6, 18:30 UTCJul 6, 18:40 UTC10m
2026-07-06 N720CL - Jul 6, 15:30 UTCJul 6, 15:40 UTC10m
2026-07-06 N720CL - Jul 6, 13:50 UTCJul 6, 14:10 UTC20m
2026-07-01 N720CL - Jul 1, 17:20 UTCJul 1, 17:35 UTC15m
2026-07-01 N720CL - Jul 1, 14:00 UTCJul 1, 14:20 UTC20m
2026-06-30 N720CL - Jun 30, 15:55 UTCJun 30, 16:15 UTC20m
2026-06-30 N720CL - Jun 30, 14:05 UTCJun 30, 14:50 UTC45m
2026-06-29 N720CL - Jun 29, 17:34 UTCJun 29, 17:49 UTC15m
2026-06-29 N720CL - Jun 29, 16:04 UTCJun 29, 16:15 UTC10m
2026-06-29 N720CL - Jun 29, 14:04 UTCJun 29, 14:19 UTC15m
2026-06-24 N720CL - Jun 24, 17:10 UTCJun 24, 17:25 UTC15m
2026-06-24 N720CL - Jun 24, 13:50 UTCJun 24, 14:04 UTC15m
2026-06-23 N720CL - Jun 23, 17:30 UTCJun 23, 17:50 UTC20m
2026-06-23 N720CL - Jun 23, 14:15 UTCJun 23, 14:35 UTC20m
2026-06-22 N720CL - Jun 22, 18:54 UTCJun 22, 19:05 UTC10m
2026-06-22 N720CL - Jun 22, 14:10 UTCJun 22, 14:29 UTC20m
2026-06-18 N720CL - Jun 18, 17:35 UTCJun 18, 17:50 UTC15m
2026-06-18 N720CL - Jun 18, 15:10 UTCJun 18, 15:25 UTC15m
2026-06-17 N720CL - Jun 17, 16:40 UTCJun 17, 18:15 UTC1h 35m
2026-06-17 N720CL - Jun 17, 14:45 UTCJun 17, 15:05 UTC20m
2026-06-17 N720CL - Jun 17, 13:50 UTCJun 17, 14:05 UTC15m
2026-06-16 N720CL - Jun 16, 17:30 UTCJun 16, 19:00 UTC1h 30m
2026-06-16 N720CL - Jun 16, 14:50 UTCJun 16, 15:35 UTC45m
2026-06-16 N720CL - Jun 16, 13:34 UTCJun 16, 14:25 UTC50m
2026-06-15 N720CL - Jun 15, 16:40 UTCJun 15, 17:10 UTC30m
2026-06-15 N720CL - Jun 15, 15:04 UTCJun 15, 15:35 UTC30m
2026-06-15 N720CL - Jun 15, 14:00 UTCJun 15, 14:20 UTC20m
2026-06-09 N720CL - Jun 9, 14:00 UTCJun 9, 14:20 UTC20m
2026-06-08 N720CL - Jun 8, 16:55 UTCJun 8, 17:10 UTC15m
2026-06-08 N720CL - Jun 8, 14:00 UTCJun 8, 14:15 UTC15m
2026-06-03 N720CL - Jun 3, 16:55 UTCJun 3, 17:10 UTC15m
2026-06-03 N720CL - Jun 3, 14:00 UTCJun 3, 14:25 UTC25m
2026-06-02 N720CL - Jun 2, 15:45 UTCJun 2, 16:00 UTC15m
2026-06-02 N720CL - Jun 2, 13:45 UTCJun 2, 14:00 UTC15m
2026-06-01 N720CL - Jun 1, 18:15 UTCJun 1, 18:30 UTC15m
2026-06-01 N720CL - Jun 1, 16:20 UTCJun 1, 16:40 UTC20m
2026-06-01 N720CL - Jun 1, 14:10 UTCJun 1, 14:35 UTC25m
2026-05-28 N720CL - May 28, 18:55 UTCMay 28, 19:10 UTC15m
2026-05-28 N720CL - May 28, 17:20 UTCMay 28, 17:40 UTC20m
2026-05-28 N720CL - May 28, 13:55 UTCMay 28, 14:10 UTC15m

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 N720CL page for operator, model, and routing details .

Mode-S A9A3C9 frequently asked

What is Mode-S code A9A3C9?
A9A3C9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N720CL.
Where is Mode-S A9A3C9 registered?
Mode-S code A9A3C9 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 A9A3C9 broadcasting right now?
No active broadcast right now. Last signal was 14h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9A3C9, octal 52321711, decimal 11,117,513.
What flights does A9A3C9 operate?
Mode-S A9A3C9 has broadcast 1 distinct callsign, including N720CL.