Apparatus

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sensors Mode-S transponder

A9E956

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N738FX · CESSNA 408 SkyCourier · operated by FEDERAL EXPRESS CORP

Hex
A9E956
Octal
52364526
Decimal
11,135,318
Country
US
Tail
N738FX
Type
C408
No current signal · last broadcast 2h ago
Flights observed
57
Distinct callsigns
9
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A9E956.

Country allocation

The ICAO 24-bit address A9E956 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 9 distinct

Callsign Airline Flights Last seen
CFS7255 Empire Airlines 14 2026-05-30
CFS8204 Empire Airlines 12 2026-05-29
CFS8731 Empire Airlines 9 2026-05-12
CFS4731 Empire Airlines 9 2026-05-12
CFS7204 Empire Airlines 6 2026-05-18
CFS4204 Empire Airlines 3 2026-05-26
CFS4255 Empire Airlines 2 2026-05-04
CFS7697 Empire Airlines 1 2026-05-27
CFS202 Empire Airlines 1 2026-04-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CFS7255 RDD → SMF May 30, 01:25 UTCMay 30, 02:00 UTC35m
2026-05-29 CFS8204 SMF → RDD May 29, 15:35 UTCMay 29, 16:25 UTC50m
2026-05-29 CFS7255 RDD → SMF May 29, 01:25 UTCMay 29, 02:05 UTC40m
2026-05-28 CFS8204 SMF → RDD May 28, 15:35 UTCMay 28, 16:10 UTC35m
2026-05-28 CFS7255 RDD → SMF May 28, 01:25 UTCMay 28, 02:00 UTC35m
2026-05-27 CFS8204 SMF → RDD May 27, 15:30 UTCMay 27, 16:10 UTC40m
2026-05-27 CFS7697 RDD → SMF May 27, 00:10 UTCMay 27, 00:49 UTC40m
2026-05-26 CFS4204 SMF → RDD May 26, 22:39 UTCMay 26, 23:19 UTC40m
2026-05-23 CFS7255 RDD → SMF May 23, 01:25 UTCMay 23, 02:05 UTC40m
2026-05-22 CFS8204 SMF → RDD May 22, 15:25 UTCMay 22, 16:05 UTC40m
2026-05-22 CFS7255 RDD → SMF May 22, 01:20 UTCMay 22, 02:00 UTC40m
2026-05-21 CFS8204 SMF → RDD May 21, 14:45 UTCMay 21, 15:25 UTC40m
2026-05-21 CFS7255 RDD → SMF May 21, 01:20 UTCMay 21, 01:55 UTC35m
2026-05-20 CFS8204 SMF → RDD May 20, 15:05 UTCMay 20, 15:45 UTC40m
2026-05-20 CFS7255 RDD → SMF May 20, 01:15 UTCMay 20, 01:55 UTC40m
2026-05-19 CFS8204 SMF → RDD May 19, 15:00 UTCMay 19, 15:40 UTC40m
2026-05-18 CFS7204 RDD → SMF May 18, 23:10 UTCMay 18, 23:55 UTC45m
2026-05-18 CFS4204 SMF → RDD May 18, 21:10 UTCMay 18, 21:50 UTC40m
2026-05-16 CFS7255 RDD → SMF May 16, 01:25 UTCMay 16, 02:05 UTC40m
2026-05-15 CFS8204 SMF → RDD May 15, 14:30 UTCMay 15, 15:10 UTC39m
2026-05-15 CFS7255 RDD → SMF May 15, 01:20 UTCMay 15, 02:00 UTC40m
2026-05-14 CFS8204 SMF → RDD May 14, 14:40 UTCMay 14, 15:20 UTC40m
2026-05-14 CFS7255 RDD → SMF May 14, 01:25 UTCMay 14, 02:05 UTC40m
2026-05-13 CFS8204 SMF → RDD May 13, 14:55 UTCMay 13, 15:35 UTC40m
2026-05-12 CFS7204 RDD → SMF May 12, 23:20 UTCMay 13, 00:00 UTC40m
2026-05-12 CFS4731 ACV → RDD May 12, 21:35 UTCMay 12, 21:50 UTC15m
2026-05-12 CFS8731 SMF → ACV May 12, 15:20 UTCMay 12, 16:00 UTC40m
2026-05-08 CFS4731 ACV → RDD May 8, 23:55 UTCMay 9, 00:35 UTC40m
2026-05-08 CFS8731 SMF → ACV May 8, 15:15 UTCMay 8, 16:00 UTC45m
2026-05-08 CFS4731 ACV → RDD May 8, 00:09 UTCMay 8, 00:49 UTC40m
2026-05-07 CFS8731 SMF → ACV May 7, 15:15 UTCMay 7, 15:50 UTC35m
2026-05-06 CFS7204 RDD → SMF May 6, 23:25 UTCMay 7, 00:05 UTC40m
2026-05-06 CFS4731 ACV → RDD May 6, 21:20 UTCMay 6, 21:40 UTC20m
2026-05-06 CFS8731 SMF → ACV May 6, 16:55 UTCMay 6, 17:40 UTC44m
2026-05-05 CFS7204 RDD → SMF May 5, 23:10 UTCMay 5, 23:50 UTC40m
2026-05-05 CFS4731 ACV → RDD May 5, 21:10 UTCMay 5, 21:30 UTC20m
2026-05-05 CFS8731 SMF → ACV May 5, 15:25 UTCMay 5, 16:06 UTC40m
2026-05-05 CFS7255 RDD → SMF May 5, 01:20 UTCMay 5, 02:01 UTC40m
2026-05-04 CFS4255 SMF → RDD May 4, 23:00 UTCMay 4, 23:50 UTC50m
2026-05-01 CFS4731 ACV → RDD May 1, 23:50 UTCMay 2, 00:35 UTC45m
2026-05-01 CFS8731 SMF → ACV May 1, 15:35 UTCMay 1, 16:15 UTC40m
2026-04-30 CFS4731 ACV → RDD Apr 30, 23:45 UTCMay 1, 00:30 UTC45m
2026-04-30 CFS8731 SMF → ACV Apr 30, 15:30 UTCApr 30, 16:10 UTC40m
2026-04-29 CFS7204 RDD → SMF Apr 29, 23:35 UTCApr 30, 00:15 UTC40m
2026-04-29 CFS4731 ACV → RDD Apr 29, 21:40 UTCApr 29, 22:00 UTC20m
2026-04-29 CFS8731 SMF → ACV Apr 29, 16:20 UTCApr 29, 17:05 UTC45m
2026-04-28 CFS7204 RDD → SMF Apr 28, 23:20 UTCApr 28, 23:54 UTC35m
2026-04-28 CFS4731 ACV → RDD Apr 28, 21:30 UTCApr 28, 21:50 UTC20m
2026-04-28 CFS8731 SMF → ACV Apr 28, 16:55 UTCApr 28, 17:30 UTC35m
2026-04-28 CFS7255 RDD → SMF Apr 28, 01:35 UTCApr 28, 02:15 UTC40m

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 N738FX page for operator, model, and routing details .

Mode-S A9E956 frequently asked

What is Mode-S code A9E956?
A9E956 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N738FX.
Where is Mode-S A9E956 registered?
Mode-S code A9E956 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 A9E956 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9E956, octal 52364526, decimal 11,135,318.
What flights does A9E956 operate?
Mode-S A9E956 has broadcast 9 distinct callsigns, including CFS7255, CFS8204, CFS8731, CFS4731, CFS7204.