Apparatus

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sensors Mode-S transponder

AAF503

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N805FX · ATR-72-212 · operated by FEDERAL EXPRESS CORP

Hex
AAF503
Octal
52572403
Decimal
11,203,843
Country
US
Tail
N805FX
Type
AT73
No current signal · last broadcast 20d ago
Flights observed
153
Distinct callsigns
7
Country
US
Last broadcast
20d ago

Last known position

Most recent position reported by Mode-S AAF503.

Country allocation

The ICAO 24-bit address AAF503 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 7 distinct

Callsign Airline Flights Last seen
CFS8284 - 39 2026-06-16
CFS8757 - 37 2026-06-17
CFS7757 - 36 2026-06-22
CFS7284 - 36 2026-06-17
CFS4757 Empire Airlines 2 2026-06-05
CFS4284 Empire Airlines 2 2026-06-05
CFS7739 - 1 2026-06-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-23 CFS7739 - Jun 23, 23:59 UTCJun 24, 00:09 UTC10m
2026-06-22 CFS7757 - Jun 22, 20:44 UTCJun 22, 21:10 UTC25m
2026-06-19 CFS7757 - Jun 19, 19:04 UTCJun 19, 19:25 UTC20m
2026-06-19 CFS7757 - Jun 19, 14:44 UTCJun 19, 18:09 UTC3h 25m
2026-06-17 CFS8757 - Jun 17, 13:25 UTCJun 17, 13:50 UTC25m
2026-06-17 CFS7284 - Jun 17, 08:15 UTCJun 17, 09:20 UTC1h 5m
2026-06-17 CFS7284 - Jun 17, 03:10 UTCJun 17, 04:10 UTC1h 0m
2026-06-17 CFS7757 - Jun 17, 00:40 UTCJun 17, 01:15 UTC35m
2026-06-16 CFS8757 - Jun 16, 15:20 UTCJun 16, 15:45 UTC25m
2026-06-16 CFS8284 - Jun 16, 10:40 UTCJun 16, 11:40 UTC1h 0m
2026-06-16 CFS8284 - Jun 16, 08:55 UTCJun 16, 09:15 UTC20m
2026-06-16 CFS7284 - Jun 16, 02:45 UTCJun 16, 03:45 UTC1h 0m
2026-06-16 CFS7757 - Jun 16, 00:50 UTCJun 16, 01:19 UTC30m
2026-06-12 CFS8757 - Jun 12, 13:10 UTCJun 12, 13:35 UTC25m
2026-06-12 CFS8284 AFW → LBB Jun 12, 08:45 UTCJun 12, 09:45 UTC1h 0m
2026-06-12 CFS7284 LBB → AFW Jun 12, 02:55 UTCJun 12, 04:00 UTC1h 5m
2026-06-12 CFS7757 MAF → LBB Jun 12, 00:35 UTCJun 12, 01:00 UTC25m
2026-06-11 CFS8757 LBB → MAF Jun 11, 12:50 UTCJun 11, 13:15 UTC25m
2026-06-11 CFS8284 AFW → LBB Jun 11, 09:00 UTCJun 11, 10:00 UTC1h 0m
2026-06-11 CFS7284 LBB → AFW Jun 11, 03:00 UTCJun 11, 04:00 UTC1h 0m
2026-06-11 CFS7757 MAF → LBB Jun 11, 00:40 UTCJun 11, 01:05 UTC25m
2026-06-10 CFS8757 LBB → MAF Jun 10, 12:45 UTCJun 10, 13:10 UTC25m
2026-06-10 CFS8284 AFW → LBB Jun 10, 08:30 UTCJun 10, 09:30 UTC1h 0m
2026-06-10 CFS7284 LBB → AFW Jun 10, 03:00 UTCJun 10, 04:00 UTC1h 0m
2026-06-10 CFS7757 MAF → LBB Jun 10, 00:35 UTCJun 10, 01:00 UTC25m
2026-06-09 CFS8757 LBB → MAF Jun 9, 12:50 UTCJun 9, 13:15 UTC25m
2026-06-09 CFS8284 AFW → LBB Jun 9, 08:35 UTCJun 9, 09:35 UTC1h 0m
2026-06-09 CFS7284 LBB → AFW Jun 9, 02:55 UTCJun 9, 03:55 UTC1h 0m
2026-06-09 CFS7757 MAF → LBB Jun 9, 00:35 UTCJun 9, 01:00 UTC25m
2026-06-05 CFS8757 LBB → MAF Jun 5, 12:35 UTCJun 5, 13:05 UTC30m
2026-06-05 CFS8284 AFW → LBB Jun 5, 08:30 UTCJun 5, 09:35 UTC1h 5m
2026-06-05 CFS4284 AFW → MAF Jun 5, 04:00 UTCJun 5, 05:00 UTC1h 0m
2026-06-05 CFS4757 MAF → AFW Jun 5, 02:40 UTCJun 5, 03:10 UTC30m
2026-06-04 CFS8757 LBB → MAF Jun 4, 13:10 UTCJun 4, 13:40 UTC30m
2026-06-04 CFS8284 AFW → LBB Jun 4, 08:35 UTCJun 4, 09:30 UTC55m
2026-06-04 CFS7284 LBB → AFW Jun 4, 03:05 UTCJun 4, 04:10 UTC1h 5m
2026-06-04 CFS7757 MAF → LBB Jun 4, 00:40 UTCJun 4, 01:10 UTC30m
2026-06-03 CFS8757 LBB → MAF Jun 3, 13:55 UTCJun 3, 14:20 UTC25m
2026-06-03 CFS8284 AFW → LBB Jun 3, 08:20 UTCJun 3, 09:35 UTC1h 15m
2026-06-03 CFS7284 LBB → AFW Jun 3, 03:15 UTCJun 3, 04:20 UTC1h 5m
2026-06-03 CFS7757 MAF → LBB Jun 3, 00:40 UTCJun 3, 01:05 UTC25m
2026-06-02 CFS8757 LBB → MAF Jun 2, 13:45 UTCJun 2, 14:10 UTC25m
2026-06-02 CFS8284 AFW → LBB Jun 2, 08:55 UTCJun 2, 09:50 UTC55m
2026-06-02 CFS7284 LBB → AFW Jun 2, 02:55 UTCJun 2, 03:50 UTC55m
2026-06-02 CFS7757 MAF → LBB Jun 2, 00:45 UTCJun 2, 01:10 UTC25m
2026-05-29 CFS8757 LBB → MAF May 29, 13:20 UTCMay 29, 13:55 UTC35m
2026-05-29 CFS8284 AFW → LBB May 29, 09:00 UTCMay 29, 10:00 UTC1h 0m
2026-05-29 CFS7284 LBB → AFW May 29, 03:05 UTCMay 29, 04:00 UTC55m
2026-05-29 CFS7757 MAF → LBB May 29, 00:40 UTCMay 29, 01:05 UTC25m
2026-05-28 CFS8757 LBB → MAF May 28, 13:10 UTCMay 28, 13:40 UTC30m

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 N805FX page for operator, model, and routing details .

Mode-S AAF503 frequently asked

What is Mode-S code AAF503?
AAF503 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N805FX.
Where is Mode-S AAF503 registered?
Mode-S code AAF503 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 AAF503 broadcasting right now?
No active broadcast right now. Last signal was 20d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAF503, octal 52572403, decimal 11,203,843.
What flights does AAF503 operate?
Mode-S AAF503 has broadcast 7 distinct callsigns, including CFS8284, CFS8757, CFS7757, CFS7284, CFS4757.