Apparatus

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sensors Mode-S transponder

A9C1D7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N728FX · CESSNA 208 Caravan · operated by FEDERAL EXPRESS CORPORATION

Hex
A9C1D7
Octal
52340727
Decimal
11,125,207
Country
US
Tail
N728FX
Type
C208
No current signal · last broadcast 2d ago
Flights observed
69
Distinct callsigns
8
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A9C1D7.

Country allocation

The ICAO 24-bit address A9C1D7 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 8 distinct

Callsign Airline Flights Last seen
CFS8664 - 21 2026-07-10
CFS4664 - 20 2026-07-10
CFS8676 Empire Airlines 12 2026-06-19
CFS7676 - 12 2026-06-19
CFS8986 - 1 2026-07-15
CFS8961 - 1 2026-06-29
CFS4986 - 1 2026-07-15
CFS4961 - 1 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 CFS4986 HOM → ANC Jul 15, 20:45 UTCJul 15, 21:35 UTC50m
2026-07-15 CFS8986 - Jul 15, 19:20 UTCJul 15, 20:05 UTC45m
2026-07-10 CFS4664 ENA → ANC Jul 10, 18:00 UTCJul 10, 18:25 UTC25m
2026-07-10 CFS8664 - Jul 10, 17:00 UTCJul 10, 17:20 UTC20m
2026-07-09 CFS4664 ENA → ANC Jul 9, 18:15 UTCJul 9, 18:40 UTC25m
2026-07-09 CFS8664 - Jul 9, 17:00 UTCJul 9, 17:20 UTC20m
2026-07-08 CFS4664 ENA → ANC Jul 8, 18:25 UTCJul 8, 18:55 UTC30m
2026-07-08 CFS8664 - Jul 8, 17:05 UTCJul 8, 17:25 UTC20m
2026-07-07 CFS4664 - Jul 7, 18:10 UTCJul 7, 18:45 UTC35m
2026-07-07 CFS8664 ANC → ENA Jul 7, 17:10 UTCJul 7, 17:30 UTC20m
2026-06-29 CFS4961 ENA → ANC Jun 29, 20:04 UTCJun 29, 20:35 UTC30m
2026-06-29 CFS8961 - Jun 29, 19:00 UTCJun 29, 19:20 UTC20m
2026-06-26 CFS4664 ENA → ANC Jun 26, 18:15 UTCJun 26, 18:44 UTC30m
2026-06-26 CFS8664 - Jun 26, 17:00 UTCJun 26, 17:19 UTC20m
2026-06-25 CFS4664 ENA → ANC Jun 25, 18:15 UTCJun 25, 18:34 UTC20m
2026-06-25 CFS8664 - Jun 25, 16:59 UTCJun 25, 17:20 UTC20m
2026-06-24 CFS4664 ENA → ANC Jun 24, 18:05 UTCJun 24, 18:29 UTC25m
2026-06-24 CFS8664 - Jun 24, 16:59 UTCJun 24, 17:20 UTC20m
2026-06-23 CFS4664 ENA → ANC Jun 23, 18:10 UTCJun 23, 18:45 UTC35m
2026-06-23 CFS8664 ANC → ENA Jun 23, 17:09 UTCJun 23, 17:30 UTC20m
2026-06-19 CFS7676 HOM → ANC Jun 19, 20:09 UTCJun 19, 20:55 UTC45m
2026-06-19 CFS8676 ANC → HOM Jun 19, 18:30 UTCJun 19, 19:19 UTC50m
2026-06-18 CFS7676 HOM → ANC Jun 18, 19:45 UTCJun 18, 20:35 UTC50m
2026-06-18 CFS8676 ANC → HOM Jun 18, 18:10 UTCJun 18, 19:00 UTC50m
2026-06-17 CFS7676 - Jun 17, 20:05 UTCJun 17, 20:50 UTC45m
2026-06-17 CFS8676 ANC → HOM Jun 17, 18:30 UTCJun 17, 19:15 UTC45m
2026-06-16 CFS7676 HOM → ANC Jun 16, 19:25 UTCJun 16, 20:05 UTC41m
2026-06-16 CFS8676 ANC → HOM Jun 16, 17:55 UTCJun 16, 18:35 UTC40m
2026-06-15 CFS7676 - Jun 15, 19:50 UTCJun 15, 20:40 UTC50m
2026-06-15 CFS8676 ANC → HOM Jun 15, 18:15 UTCJun 15, 19:05 UTC50m
2026-06-12 CFS7676 HOM → ANC Jun 12, 19:55 UTCJun 12, 20:50 UTC55m
2026-06-12 CFS8676 ANC → HOM Jun 12, 18:30 UTCJun 12, 19:15 UTC45m
2026-06-11 CFS7676 HOM → ANC Jun 11, 20:10 UTCJun 11, 21:00 UTC50m
2026-06-11 CFS8676 ANC → HOM Jun 11, 18:40 UTCJun 11, 19:20 UTC40m
2026-05-08 CFS7676 HOM → ANC May 8, 20:25 UTCMay 8, 21:05 UTC40m
2026-05-08 CFS8676 ANC → HOM May 8, 18:55 UTCMay 8, 19:40 UTC45m
2026-05-07 CFS7676 HOM → ANC May 7, 20:45 UTCMay 7, 21:35 UTC50m
2026-05-07 CFS8676 ANC → HOM May 7, 19:05 UTCMay 7, 19:50 UTC45m
2026-05-06 CFS7676 HOM → ANC May 6, 20:25 UTCMay 6, 21:20 UTC55m
2026-05-06 CFS8676 ANC → HOM May 6, 18:35 UTCMay 6, 19:20 UTC45m
2026-05-05 CFS7676 HOM → ANC May 5, 19:55 UTCMay 5, 20:45 UTC50m
2026-05-05 CFS8676 ANC → HOM May 5, 18:25 UTCMay 5, 19:05 UTC40m
2026-05-04 CFS7676 HOM → ANC May 4, 20:55 UTCMay 4, 22:05 UTC1h 10m
2026-05-04 CFS8676 ANC → HOM May 4, 19:00 UTCMay 4, 19:50 UTC50m
2026-05-01 CFS4664 ENA → ANC May 1, 17:55 UTCMay 1, 18:20 UTC25m
2026-05-01 CFS8664 ANC → ENA May 1, 17:00 UTCMay 1, 17:25 UTC25m
2026-04-30 CFS4664 ENA → ANC Apr 30, 17:50 UTCApr 30, 18:15 UTC25m
2026-04-30 CFS8664 ANC → ENA Apr 30, 17:00 UTCApr 30, 17:20 UTC20m
2026-04-29 CFS4664 ENA → ANC Apr 29, 18:00 UTCApr 29, 18:25 UTC25m
2026-04-29 CFS8664 ANC → ENA Apr 29, 16:45 UTCApr 29, 17:05 UTC20m

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 N728FX page for operator, model, and routing details .

Mode-S A9C1D7 frequently asked

What is Mode-S code A9C1D7?
A9C1D7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N728FX.
Where is Mode-S A9C1D7 registered?
Mode-S code A9C1D7 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 A9C1D7 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9C1D7, octal 52340727, decimal 11,125,207.
What flights does A9C1D7 operate?
Mode-S A9C1D7 has broadcast 8 distinct callsigns, including CFS8664, CFS4664, CFS8676, CFS7676, CFS8986.