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 21h ago
Flights observed
108
Distinct callsigns
6
Country
US
Last broadcast
21h 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 6 distinct

Callsign Airline Flights Last seen
CFS8284 Empire Airlines 29 2026-05-29
CFS8757 Empire Airlines 27 2026-05-29
CFS7284 Empire Airlines 26 2026-05-29
CFS7757 Empire Airlines 24 2026-05-29
CFS4757 Empire Airlines 1 2026-04-23
CFS4284 Empire Airlines 1 2026-04-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-05-28 CFS8284 AFW → LBB May 28, 08:55 UTCMay 28, 10:00 UTC1h 5m
2026-05-28 CFS7284 LBB → AFW May 28, 03:10 UTCMay 28, 04:05 UTC55m
2026-05-28 CFS7757 MAF → LBB May 28, 00:45 UTCMay 28, 01:15 UTC30m
2026-05-27 CFS8757 LBB → MAF May 27, 13:40 UTCMay 27, 14:05 UTC25m
2026-05-27 CFS8284 AFW → LBB May 27, 09:45 UTCMay 27, 10:45 UTC1h 0m
2026-05-27 CFS7284 LBB → AFW May 27, 03:09 UTCMay 27, 04:19 UTC1h 10m
2026-05-27 CFS7757 MAF → LBB May 27, 00:25 UTCMay 27, 00:44 UTC20m
2026-05-22 CFS8757 LBB → MAF May 22, 12:45 UTCMay 22, 13:10 UTC25m
2026-05-22 CFS8284 AFW → LBB May 22, 08:20 UTCMay 22, 09:20 UTC1h 0m
2026-05-22 CFS7284 LBB → AFW May 22, 02:55 UTCMay 22, 03:55 UTC1h 0m
2026-05-22 CFS7757 MAF → LBB May 22, 00:35 UTCMay 22, 01:05 UTC30m
2026-05-21 CFS8757 LBB → MAF May 21, 12:45 UTCMay 21, 13:15 UTC30m
2026-05-21 CFS8284 AFW → LBB May 21, 08:30 UTCMay 21, 09:30 UTC1h 0m
2026-05-21 CFS7284 LBB → AFW May 21, 02:55 UTCMay 21, 03:55 UTC1h 0m
2026-05-21 CFS7757 MAF → LBB May 21, 00:30 UTCMay 21, 01:00 UTC30m
2026-05-20 CFS8757 LBB → MAF May 20, 13:10 UTCMay 20, 13:40 UTC30m
2026-05-20 CFS8284 AFW → LBB May 20, 08:35 UTCMay 20, 09:35 UTC1h 0m
2026-05-20 CFS7284 LBB → AFW May 20, 03:10 UTCMay 20, 04:10 UTC1h 0m
2026-05-20 CFS7757 MAF → LBB May 20, 00:45 UTCMay 20, 01:10 UTC25m
2026-05-19 CFS8757 LBB → MAF May 19, 13:20 UTCMay 19, 13:45 UTC25m
2026-05-19 CFS8284 AFW → LBB May 19, 08:40 UTCMay 19, 09:40 UTC1h 0m
2026-05-19 CFS7284 LBB → AFW May 19, 02:55 UTCMay 19, 03:55 UTC1h 0m
2026-05-19 CFS7757 MAF → LBB May 19, 00:40 UTCMay 19, 01:05 UTC25m
2026-05-15 CFS8757 LBB → MAF May 15, 15:25 UTCMay 15, 16:00 UTC35m
2026-05-15 CFS8284 AFW → LBB May 15, 08:20 UTCMay 15, 09:20 UTC1h 0m
2026-05-15 CFS7284 LBB → AFW May 15, 02:55 UTCMay 15, 03:50 UTC55m
2026-05-15 CFS7757 MAF → LBB May 15, 00:45 UTCMay 15, 01:15 UTC30m
2026-05-14 CFS8757 LBB → MAF May 14, 12:35 UTCMay 14, 13:01 UTC25m
2026-05-14 CFS8284 AFW → LBB May 14, 08:35 UTCMay 14, 09:35 UTC1h 0m
2026-05-14 CFS7284 LBB → AFW May 14, 03:00 UTCMay 14, 03:55 UTC55m
2026-05-14 CFS7757 MAF → LBB May 14, 00:35 UTCMay 14, 01:05 UTC30m
2026-05-13 CFS8757 LBB → MAF May 13, 12:55 UTCMay 13, 13:20 UTC25m
2026-05-13 CFS8284 AFW → LBB May 13, 08:30 UTCMay 13, 09:25 UTC55m
2026-05-13 CFS7284 LBB → AFW May 13, 03:05 UTCMay 13, 04:00 UTC55m
2026-05-13 CFS7757 MAF → LBB May 13, 00:40 UTCMay 13, 01:10 UTC30m
2026-05-12 CFS8757 LBB → MAF May 12, 13:20 UTCMay 12, 13:45 UTC25m
2026-05-12 CFS8284 AFW → LBB May 12, 08:30 UTCMay 12, 09:30 UTC1h 0m
2026-05-12 CFS7284 LBB → AFW May 12, 02:50 UTCMay 12, 03:50 UTC1h 0m
2026-05-08 CFS8757 LBB → MAF May 8, 13:15 UTCMay 8, 13:45 UTC30m
2026-05-08 CFS8284 AFW → LBB May 8, 08:59 UTCMay 8, 10:09 UTC1h 10m
2026-05-08 CFS7284 LBB → AFW May 8, 03:04 UTCMay 8, 04:04 UTC1h 0m
2026-05-08 CFS7757 MAF → LBB May 8, 00:44 UTCMay 8, 01:04 UTC20m
2026-05-07 CFS8757 LBB → MAF May 7, 13:05 UTCMay 7, 13:35 UTC30m
2026-05-07 CFS8284 AFW → LBB May 7, 08:35 UTCMay 7, 09:40 UTC1h 5m
2026-05-07 CFS7284 LBB → AFW May 7, 03:10 UTCMay 7, 04:05 UTC55m

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 21h 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 6 distinct callsigns, including CFS8284, CFS8757, CFS7284, CFS7757, CFS4757.