Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ACFFE6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N937CK · CESSNA 208 Caravan · operated by SCHUMAN CARRIAGE COMPANY LTD

Hex
ACFFE6
Octal
53177746
Decimal
11,337,702
Country
US
Tail
N937CK
Type
C208
No current signal · last broadcast 1d ago
Flights observed
200
Distinct callsigns
20
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S ACFFE6.

Country allocation

The ICAO 24-bit address ACFFE6 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 20 distinct

Callsign Airline Flights Last seen
FDY455 Southern Airways Express 22 2026-05-31
FDY454 Southern Airways Express 19 2026-05-31
FDY458 Southern Airways Express 15 2026-05-31
FDY405 Southern Airways Express 14 2026-05-22
FDY459 Southern Airways Express 13 2026-05-31
FDY404 Southern Airways Express 13 2026-05-22
FDY452 Southern Airways Express 11 2026-05-30
FDY453 Southern Airways Express 10 2026-05-30
FDY409 Southern Airways Express 10 2026-05-22
FDY408 Southern Airways Express 10 2026-05-21
FDY66 Southern Airways Express 7 2026-05-22
FDY450 Southern Airways Express 7 2026-04-30
FDY436 Southern Airways Express 7 2026-05-17
FDY419 Southern Airways Express 7 2026-05-17
FDY67 Southern Airways Express 5 2026-05-21
FDY449 Southern Airways Express 5 2026-04-30
FDY434 Southern Airways Express 5 2026-05-16
FDY411 Southern Airways Express 4 2026-05-16
FDY8031 Southern Airways Express 2 2026-05-07
FDY432 Southern Airways Express 2 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-01 FDY8071 LNS → DUJ Jun 1, 02:10 UTCJun 1, 02:35 UTC25m
2026-05-31 FDY459 BNA → JBR May 31, 23:15 UTCJun 1, 00:40 UTC1h 25m
2026-05-31 FDY458 JBR → BNA May 31, 21:10 UTCMay 31, 22:30 UTC1h 20m
2026-05-31 FDY455 STL → JBR May 31, 18:50 UTCMay 31, 19:55 UTC1h 5m
2026-05-31 FDY454 JBR → STL May 31, 16:55 UTCMay 31, 18:15 UTC1h 20m
2026-05-30 FDY459 BNA → JBR May 30, 20:55 UTCMay 30, 22:10 UTC1h 15m
2026-05-30 FDY458 JBR → BNA May 30, 18:55 UTCMay 30, 20:20 UTC1h 25m
2026-05-30 FDY453 BNA → JBR May 30, 14:40 UTCMay 30, 16:05 UTC1h 25m
2026-05-30 FDY452 JBR → BNA May 30, 12:45 UTCMay 30, 14:10 UTC1h 25m
2026-05-29 FDY458 JBR → BNA May 29, 21:35 UTCMay 30, 00:30 UTC2h 55m
2026-05-29 FDY455 STL → JBR May 29, 18:50 UTCMay 29, 20:00 UTC1h 10m
2026-05-29 FDY454 JBR → STL May 29, 17:10 UTCMay 29, 18:20 UTC1h 10m
2026-05-29 FDY453 BNA → JBR May 29, 15:15 UTCMay 29, 16:30 UTC1h 15m
2026-05-29 FDY452 JBR → BNA May 29, 12:40 UTCMay 29, 14:00 UTC1h 20m
2026-05-28 FDY458 JBR → BNA May 28, 22:00 UTCMay 29, 01:00 UTC3h 0m
2026-05-28 FDY455 STL → JBR May 28, 19:35 UTCMay 28, 19:50 UTC15m
2026-05-28 FDY455 STL → JBR May 28, 18:40 UTCMay 28, 19:05 UTC25m
2026-05-28 FDY454 JBR → STL May 28, 16:50 UTCMay 28, 18:00 UTC1h 10m
2026-05-27 FDY459 BNA → JBR May 27, 23:35 UTCMay 28, 00:50 UTC1h 15m
2026-05-27 FDY458 JBR → BNA May 27, 21:45 UTCMay 27, 22:55 UTC1h 10m
2026-05-27 FDY455 STL → JBR May 27, 18:55 UTCMay 27, 20:05 UTC1h 10m
2026-05-27 FDY454 JBR → STL May 27, 17:40 UTCMay 27, 18:05 UTC25m
2026-05-27 FDY454 JBR → STL May 27, 16:50 UTCMay 27, 17:10 UTC20m
2026-05-27 FDY452 JBR → BNA May 27, 13:10 UTCMay 27, 16:10 UTC3h 0m
2026-05-26 FDY455 STL → JBR May 26, 19:05 UTCMay 26, 20:29 UTC1h 25m
2026-05-26 FDY454 JBR → STL May 26, 17:20 UTCMay 26, 18:34 UTC1h 15m
2026-05-26 FDY453 BNA → JBR May 26, 15:09 UTCMay 26, 16:40 UTC1h 30m
2026-05-26 FDY452 JBR → BNA May 26, 12:45 UTCMay 26, 14:24 UTC1h 40m
2026-05-26 FDY459 BNA → JBR May 26, 00:00 UTCMay 26, 01:14 UTC1h 15m
2026-05-25 FDY458 JBR → BNA May 25, 21:35 UTCMay 25, 23:00 UTC1h 25m
2026-05-25 FDY455 STL → JBR May 25, 19:59 UTCMay 25, 20:09 UTC10m
2026-05-25 FDY455 STL → JBR May 25, 19:05 UTCMay 25, 19:25 UTC20m
2026-05-25 FDY454 JBR → STL May 25, 16:50 UTCMay 25, 18:05 UTC1h 15m
2026-05-25 FDY453 BNA → JBR May 25, 14:45 UTCMay 25, 16:00 UTC1h 15m
2026-05-25 FDY452 JBR → BNA May 25, 12:35 UTCMay 25, 14:00 UTC1h 25m
2026-05-24 FDY459 BNA → JBR May 24, 23:25 UTCMay 24, 23:46 UTC21m
2026-05-24 FDY455 STL → JBR May 24, 19:15 UTCMay 24, 21:45 UTC2h 30m
2026-05-24 FDY454 JBR → STL May 24, 17:55 UTCMay 24, 18:15 UTC20m
2026-05-24 FDY454 JBR → STL May 24, 17:00 UTCMay 24, 17:20 UTC20m
2026-05-23 FDY459 BNA → JBR May 23, 20:35 UTCMay 23, 21:55 UTC1h 20m
2026-05-23 FDY458 JBR → BNA May 23, 18:15 UTCMay 23, 19:35 UTC1h 20m
2026-05-23 FDY453 BNA → JBR May 23, 14:50 UTCMay 23, 16:10 UTC1h 20m
2026-05-23 FDY452 JBR → BNA May 23, 12:45 UTCMay 23, 14:05 UTC1h 20m
2026-05-23 FDY8052 LNS → LAF May 23, 01:25 UTCMay 23, 01:50 UTC25m
2026-05-22 FDY66 HRO → MEM May 22, 17:35 UTCMay 22, 18:10 UTC35m
2026-05-22 FDY405 DFW → HRO May 22, 13:55 UTCMay 22, 15:35 UTC1h 40m
2026-05-22 FDY404 HRO → DFW May 22, 11:15 UTCMay 22, 13:00 UTC1h 45m
2026-05-22 FDY409 DFW → HRO May 22, 00:40 UTCMay 22, 02:20 UTC1h 40m
2026-05-21 FDY408 HRO → DFW May 21, 22:00 UTCMay 21, 23:40 UTC1h 40m
2026-05-21 FDY67 MEM → HRO May 21, 18:50 UTCMay 21, 19:20 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 N937CK page for operator, model, and routing details .

Mode-S ACFFE6 frequently asked

What is Mode-S code ACFFE6?
ACFFE6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N937CK.
Where is Mode-S ACFFE6 registered?
Mode-S code ACFFE6 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 ACFFE6 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ACFFE6, octal 53177746, decimal 11,337,702.
What flights does ACFFE6 operate?
Mode-S ACFFE6 has broadcast 20 distinct callsigns, including FDY455, FDY454, FDY458, FDY405, FDY459.