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sensors Mode-S transponder

C021A4

ICAO 24-bit transponder address · allocated to Canada

Currently assigned to C-FMTF · CESSNA 172 Skyhawk · operated by Calgary Flying Club

Hex
C021A4
Octal
60020644
Decimal
12,591,524
Country
CA
Tail
C-FMTF
Type
C172
No current signal · last broadcast 13d ago
Flights observed
200
Distinct callsigns
1
Country
CA
Last broadcast
13d ago

Last known position

Most recent position reported by Mode-S C021A4.

Country allocation

The ICAO 24-bit address C021A4 falls within the block assigned to Canada (CA) by ICAO Annex 10, Volume III. Every aircraft registered in Canada 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 1 distinct

Callsign Airline Flights Last seen
CFMTF - 200 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CFMTF - Jul 26, 16:45 UTCJul 26, 17:50 UTC1h 5m
2026-07-26 CFMTF - Jul 26, 14:55 UTCJul 26, 15:50 UTC55m
2026-07-25 CFMTF - Jul 25, 18:00 UTCJul 25, 19:00 UTC1h 0m
2026-07-25 CFMTF - Jul 25, 14:30 UTCJul 25, 15:35 UTC1h 5m
2026-07-24 CFMTF - Jul 24, 21:30 UTCJul 24, 22:40 UTC1h 10m
2026-07-23 CFMTF - Jul 23, 18:05 UTCJul 23, 19:15 UTC1h 10m
2026-07-23 CFMTF - Jul 23, 15:10 UTCJul 23, 16:05 UTC55m
2026-07-22 CFMTF - Jul 22, 23:40 UTCJul 23, 00:45 UTC1h 5m
2026-07-22 CFMTF - Jul 22, 17:00 UTCJul 22, 17:45 UTC45m
2026-07-22 CFMTF - Jul 22, 14:00 UTCJul 22, 15:40 UTC1h 40m
2026-07-21 CFMTF - Jul 21, 17:35 UTCJul 21, 18:15 UTC40m
2026-07-20 CFMTF - Jul 20, 20:55 UTCJul 20, 22:05 UTC1h 10m
2026-07-20 CFMTF - Jul 20, 19:05 UTCJul 20, 20:15 UTC1h 10m
2026-07-20 CFMTF - Jul 20, 16:55 UTCJul 20, 17:50 UTC55m
2026-07-20 CFMTF - Jul 20, 13:45 UTCJul 20, 14:55 UTC1h 10m
2026-07-19 CFMTF - Jul 19, 21:45 UTCJul 19, 22:40 UTC55m
2026-07-19 CFMTF - Jul 19, 19:00 UTCJul 19, 20:00 UTC1h 0m
2026-07-19 CFMTF - Jul 19, 16:50 UTCJul 19, 17:45 UTC55m
2026-07-19 CFMTF - Jul 19, 14:40 UTCJul 19, 15:40 UTC1h 0m
2026-07-18 CFMTF - Jul 18, 23:30 UTCJul 19, 00:25 UTC55m
2026-07-18 CFMTF - Jul 18, 21:50 UTCJul 18, 22:35 UTC45m
2026-07-18 CFMTF - Jul 18, 18:40 UTCJul 18, 20:30 UTC1h 50m
2026-07-18 CFMTF - Jul 18, 17:20 UTCJul 18, 18:00 UTC40m
2026-07-17 CFMTF - Jul 17, 22:10 UTCJul 17, 22:40 UTC30m
2026-07-17 CFMTF - Jul 17, 16:49 UTCJul 17, 18:19 UTC1h 30m
2026-07-16 CFMTF - Jul 16, 22:30 UTCJul 16, 22:55 UTC25m
2026-07-16 CFMTF - Jul 16, 19:50 UTCJul 16, 21:19 UTC1h 30m
2026-07-15 CFMTF - Jul 15, 18:55 UTCJul 15, 20:00 UTC1h 5m
2026-07-14 CFMTF - Jul 14, 21:05 UTCJul 14, 22:05 UTC1h 0m
2026-07-14 CFMTF - Jul 14, 13:45 UTCJul 14, 15:05 UTC1h 20m
2026-07-13 CFMTF - Jul 13, 23:15 UTCJul 14, 00:15 UTC1h 0m
2026-07-13 CFMTF - Jul 13, 21:45 UTCJul 13, 22:25 UTC40m
2026-07-13 CFMTF - Jul 13, 19:25 UTCJul 13, 20:20 UTC55m
2026-07-13 CFMTF - Jul 13, 17:10 UTCJul 13, 18:00 UTC50m
2026-07-13 CFMTF - Jul 13, 14:00 UTCJul 13, 15:00 UTC1h 0m
2026-07-12 CFMTF - Jul 12, 14:45 UTCJul 12, 15:50 UTC1h 5m
2026-07-11 CFMTF - Jul 11, 16:50 UTCJul 11, 17:40 UTC50m
2026-07-11 CFMTF - Jul 11, 14:35 UTCJul 11, 15:30 UTC55m
2026-07-10 CFMTF - Jul 10, 22:00 UTCJul 10, 23:30 UTC1h 30m
2026-07-10 CFMTF - Jul 10, 17:05 UTCJul 10, 18:05 UTC1h 0m
2026-07-10 CFMTF - Jul 10, 15:05 UTCJul 10, 16:00 UTC55m
2026-07-09 CFMTF - Jul 9, 17:05 UTCJul 9, 18:15 UTC1h 10m
2026-07-09 CFMTF - Jul 9, 14:40 UTCJul 9, 15:40 UTC1h 0m
2026-07-08 CFMTF - Jul 8, 19:00 UTCJul 8, 20:10 UTC1h 10m
2026-07-08 CFMTF - Jul 8, 17:05 UTCJul 8, 18:10 UTC1h 5m
2026-07-08 CFMTF - Jul 8, 14:45 UTCJul 8, 15:55 UTC1h 10m
2026-07-08 CFMTF - Jul 8, 04:25 UTCJul 8, 05:20 UTC55m
2026-07-08 CFMTF - Jul 8, 00:00 UTCJul 8, 03:20 UTC3h 20m
2026-07-07 CFMTF - Jul 7, 17:05 UTCJul 7, 18:00 UTC55m
2026-07-07 CFMTF - Jul 7, 14:55 UTCJul 7, 16:00 UTC1h 5m

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 C-FMTF page for operator, model, and routing details .

Mode-S C021A4 frequently asked

What is Mode-S code C021A4?
C021A4 is an ICAO 24-bit transponder address. Allocated to Canada. Assigned to C-FMTF.
Where is Mode-S C021A4 registered?
Mode-S code C021A4 is allocated to Canada (CA). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is C021A4 broadcasting right now?
No active broadcast right now. Last signal was 13d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex C021A4, octal 60020644, decimal 12,591,524.
What flights does C021A4 operate?
Mode-S C021A4 has broadcast 1 distinct callsign, including CFMTF.