Apparatus

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sensors Mode-S transponder

C023BB

ICAO 24-bit transponder address · allocated to Canada

Currently assigned to C-FNNU · BOEING 777-300ER · operated by Air Canada

Hex
C023BB
Octal
60021673
Decimal
12,592,059
Country
CA
Tail
C-FNNU
Type
B77W
No current signal · last broadcast 2h ago
Flights observed
146
Distinct callsigns
15
Country
CA
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S C023BB.

Country allocation

The ICAO 24-bit address C023BB 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 15 distinct

Callsign Airline Flights Last seen
ACA892 Air Canada 16 2026-05-30
ACA875 Air Canada 16 2026-05-27
ACA893 Air Canada 14 2026-05-24
ACA311 Air Canada 14 2026-05-29
ACA874 Air Canada 12 2026-05-26
ACA6 Air Canada 11 2026-05-28
ACA870 Air Canada 10 2026-05-26
ACA5 Air Canada 10 2026-05-27
ACA871 Air Canada 9 2026-05-26
ACA922 Air Canada 8 2026-04-20
ACA304 Air Canada 8 2026-05-29
ACA923 Air Canada 7 2026-04-20
ACA899 Air Canada 4 2026-05-19
ACA898 Air Canada 4 2026-05-18
ACA314 Air Canada 3 2026-04-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 ACA892 YUL → FCO May 30, 00:05 UTCMay 30, 07:26 UTC7h 21m
2026-05-30 ACA892 YUL → FCO May 30, 00:05 UTCMay 30, 00:45 UTC40m
2026-05-29 ACA304 YVR → YUL May 29, 16:40 UTCMay 29, 21:00 UTC4h 20m
2026-05-29 ACA311 YUL → YVR May 29, 00:00 UTCMay 29, 04:40 UTC4h 40m
2026-05-28 ACA6 NRT → YUL May 28, 09:15 UTCMay 28, 20:45 UTC11h 30m
2026-05-28 ACA6 NRT → YUL May 28, 09:11 UTCMay 28, 20:46 UTC11h 35m
2026-05-27 ACA5 YUL → NRT May 27, 17:45 UTCMay 28, 06:45 UTC13h 0m
2026-05-27 ACA875 CDG → YUL May 27, 08:20 UTCMay 27, 15:00 UTC6h 40m
2026-05-26 ACA874 YUL → CDG May 26, 22:50 UTCMay 27, 05:19 UTC6h 30m
2026-05-26 ACA871 CDG → YUL May 26, 12:30 UTCMay 26, 19:05 UTC6h 35m
2026-05-26 ACA870 YUL → CDG May 26, 01:49 UTCMay 26, 08:04 UTC6h 15m
2026-05-25 ACA304 YVR → YUL May 25, 16:30 UTCMay 25, 20:40 UTC4h 9m
2026-05-24 ACA311 YUL → YVR May 24, 23:00 UTCMay 25, 03:10 UTC4h 10m
2026-05-24 ACA893 FCO → YUL May 24, 10:00 UTCMay 24, 17:55 UTC7h 55m
2026-05-24 ACA892 YUL → FCO May 24, 00:10 UTCMay 24, 06:35 UTC6h 25m
2026-05-23 ACA892 YUL → FCO May 23, 23:15 UTCMay 24, 00:05 UTC50m
2026-05-23 ACA6 NRT → YUL May 23, 09:00 UTCMay 23, 20:30 UTC11h 31m
2026-05-22 ACA5 YUL → NRT May 22, 17:20 UTCMay 23, 05:40 UTC12h 19m
2026-05-22 ACA5 YUL → NRT May 22, 17:17 UTCMay 23, 05:32 UTC12h 15m
2026-05-22 ACA875 CDG → YUL May 22, 07:45 UTCMay 22, 14:30 UTC6h 45m
2026-05-22 ACA875 CDG → YUL May 22, 07:44 UTCMay 22, 14:15 UTC6h 31m
2026-05-21 ACA874 YUL → CDG May 21, 22:30 UTCMay 22, 04:20 UTC5h 50m
2026-05-21 ACA893 FCO → YUL May 21, 09:50 UTCMay 21, 17:50 UTC8h 0m
2026-05-20 ACA892 YUL → FCO May 20, 23:35 UTCMay 21, 00:35 UTC1h 0m
2026-05-20 ACA892 YUL → FCO May 20, 23:35 UTCMay 21, 06:45 UTC7h 10m
2026-05-20 ACA304 YVR → YUL May 20, 16:25 UTCMay 20, 20:30 UTC4h 5m
2026-05-19 ACA311 YUL → YVR May 19, 22:30 UTCMay 20, 03:20 UTC4h 50m
2026-05-19 ACA311 YUL → YVR May 19, 22:29 UTCMay 20, 03:09 UTC4h 40m
2026-05-19 ACA899 ATH → YUL May 19, 09:30 UTCMay 19, 18:50 UTC9h 20m
2026-05-18 ACA898 YUL → ATH May 18, 22:20 UTCMay 19, 06:45 UTC8h 25m
2026-05-18 ACA893 FCO → YUL May 18, 10:40 UTCMay 18, 18:40 UTC7h 59m
2026-05-18 ACA892 YUL → FCO May 18, 00:25 UTCMay 18, 06:45 UTC6h 20m
2026-05-18 ACA892 YUL → FCO May 18, 00:22 UTCMay 18, 07:12 UTC6h 50m
2026-05-17 ACA871 CDG → YUL May 17, 12:45 UTCMay 17, 18:45 UTC6h 0m
2026-05-17 ACA871 CDG → YUL May 17, 12:41 UTCMay 17, 19:21 UTC6h 40m
2026-05-17 ACA870 YUL → CDG May 17, 01:55 UTCMay 17, 08:05 UTC6h 10m
2026-05-17 ACA870 YUL → CDG May 17, 01:51 UTCMay 17, 07:53 UTC6h 2m
2026-05-16 ACA6 NRT → YUL May 16, 09:31 UTCMay 16, 21:05 UTC11h 34m
2026-05-15 ACA5 YUL → NRT May 15, 17:50 UTCMay 16, 06:16 UTC12h 26m
2026-05-15 ACA875 CDG → YUL May 15, 07:35 UTCMay 15, 14:30 UTC6h 55m
2026-05-14 ACA874 YUL → CDG May 14, 22:45 UTCMay 14, 23:15 UTC30m
2026-05-14 ACA874 YUL → CDG May 14, 22:43 UTCMay 15, 04:39 UTC5h 56m
2026-05-14 ACA893 FCO → YUL May 14, 10:05 UTCMay 14, 18:10 UTC8h 5m
2026-05-13 ACA892 YUL → FCO May 13, 23:50 UTCMay 14, 07:20 UTC7h 30m
2026-05-13 ACA6 NRT → YUL May 13, 09:10 UTCMay 13, 20:50 UTC11h 40m
2026-05-12 ACA5 YUL → NRT May 12, 17:20 UTCMay 13, 06:25 UTC13h 5m
2026-05-12 ACA875 CDG → YUL May 12, 07:40 UTCMay 12, 08:30 UTC50m
2026-05-12 ACA875 CDG → YUL May 12, 07:39 UTCMay 12, 14:27 UTC6h 48m
2026-05-12 ACA874 YUL → CDG May 12, 03:05 UTCMay 12, 04:45 UTC1h 40m
2026-05-11 ACA893 FCO → YUL May 11, 09:50 UTCMay 11, 17:55 UTC8h 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-FNNU page for operator, model, and routing details .

Mode-S C023BB frequently asked

What is Mode-S code C023BB?
C023BB is an ICAO 24-bit transponder address. Allocated to Canada. Assigned to C-FNNU.
Where is Mode-S C023BB registered?
Mode-S code C023BB is allocated to Canada (CA). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is C023BB 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 C023BB, octal 60021673, decimal 12,592,059.
What flights does C023BB operate?
Mode-S C023BB has broadcast 15 distinct callsigns, including ACA892, ACA875, ACA893, ACA311, ACA874.