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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 1h ago
Flights observed
270
Distinct callsigns
18
Country
CA
Last broadcast
1h 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 18 distinct

Callsign Airline Flights Last seen
ACA875 - 26 2026-07-13
ACA6 - 25 2026-07-12
ACA893 - 22 2026-07-09
ACA892 - 22 2026-07-09
ACA874 - 22 2026-07-13
ACA311 - 21 2026-06-30
ACA5 - 20 2026-07-11
ACA871 - 17 2026-07-06
ACA870 - 17 2026-07-06
ACA898 - 15 2026-07-02
ACA304 - 15 2026-07-10
ACA899 - 13 2026-07-03
ACA922 Air Canada 8 2026-04-20
ACA833 Air Canada 8 2026-07-07
ACA832 - 8 2026-07-06
ACA923 Air Canada 7 2026-04-20
ACA314 Air Canada 3 2026-04-15
ACA2311 - 1 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 ACA874 - Jul 13, 23:10 UTCJul 14, 00:25 UTC1h 15m
2026-07-13 ACA874 YUL → CDG Jul 13, 23:10 UTCJul 14, 05:26 UTC6h 16m
2026-07-13 ACA875 - Jul 13, 14:35 UTCJul 13, 15:20 UTC45m
2026-07-13 ACA875 - Jul 13, 08:30 UTCJul 13, 14:30 UTC6h 0m
2026-07-13 ACA875 CDG → YUL Jul 13, 08:26 UTCJul 13, 15:06 UTC6h 40m
2026-07-12 ACA874 - Jul 12, 22:30 UTCJul 13, 04:50 UTC6h 20m
2026-07-12 ACA6 - Jul 12, 08:55 UTCJul 12, 15:30 UTC6h 35m
2026-07-12 ACA6 NRT → YUL Jul 12, 08:52 UTCJul 12, 20:10 UTC11h 18m
2026-07-11 ACA5 YUL → NRT Jul 11, 17:17 UTCJul 12, 05:43 UTC12h 26m
2026-07-11 ACA5 YUL → NRT Jul 11, 17:20 UTCJul 12, 05:50 UTC12h 30m
2026-07-10 ACA304 YVR → YUL Jul 10, 20:50 UTCJul 11, 00:55 UTC4h 5m
2026-07-10 ACA2311 YUL → YVR Jul 10, 13:20 UTCJul 10, 18:10 UTC4h 50m
2026-07-09 ACA893 - Jul 9, 10:05 UTCJul 9, 18:25 UTC8h 20m
2026-07-09 ACA892 YUL → FCO Jul 9, 00:10 UTCJul 9, 07:30 UTC7h 20m
2026-07-08 ACA6 - Jul 8, 08:45 UTCJul 8, 18:30 UTC9h 45m
2026-07-08 ACA6 NRT → YUL Jul 8, 08:45 UTCJul 8, 19:55 UTC11h 10m
2026-07-07 ACA5 YUL → NRT Jul 7, 17:15 UTCJul 8, 05:40 UTC12h 25m
2026-07-07 ACA833 BRU → YUL Jul 7, 07:50 UTCJul 7, 14:40 UTC6h 50m
2026-07-06 ACA832 YUL → BRU Jul 6, 22:50 UTCJul 7, 04:50 UTC6h 0m
2026-07-06 ACA832 YUL → BRU Jul 6, 22:45 UTCJul 7, 04:39 UTC5h 54m
2026-07-06 ACA871 - Jul 6, 12:30 UTCJul 6, 19:30 UTC7h 0m
2026-07-06 ACA870 - Jul 6, 02:20 UTCJul 6, 08:25 UTC6h 5m
2026-07-05 ACA6 NRT → YUL Jul 5, 08:55 UTCJul 5, 09:25 UTC30m
2026-07-05 ACA6 NRT → YUL Jul 5, 08:55 UTCJul 5, 20:39 UTC11h 44m
2026-07-04 ACA5 YUL → NRT Jul 4, 17:15 UTCJul 5, 05:20 UTC12h 5m
2026-07-04 ACA5 YUL → NRT Jul 4, 17:14 UTCJul 5, 05:11 UTC11h 57m
2026-07-04 ACA833 BRU → YUL Jul 4, 14:10 UTCJul 4, 14:55 UTC45m
2026-07-04 ACA833 BRU → YUL Jul 4, 07:50 UTCJul 4, 14:05 UTC6h 15m
2026-07-03 ACA832 YUL → BRU Jul 3, 22:55 UTCJul 4, 04:50 UTC5h 55m
2026-07-03 ACA899 ATH → YUL Jul 3, 09:40 UTCJul 3, 19:05 UTC9h 25m
2026-07-02 ACA898 YUL → ATH Jul 2, 22:40 UTCJul 3, 06:45 UTC8h 5m
2026-07-02 ACA893 FCO → YUL Jul 2, 10:15 UTCJul 2, 18:30 UTC8h 15m
2026-07-02 ACA893 FCO → YUL Jul 2, 10:14 UTCJul 2, 18:14 UTC8h 0m
2026-07-02 ACA892 - Jul 2, 00:20 UTCJul 2, 07:35 UTC7h 15m
2026-07-01 ACA304 - Jul 1, 16:30 UTCJul 1, 20:45 UTC4h 15m
2026-06-30 ACA311 YUL → YVR Jun 30, 21:55 UTCJul 1, 02:35 UTC4h 40m
2026-06-30 ACA899 ATH → YUL Jun 30, 09:45 UTCJun 30, 18:50 UTC9h 5m
2026-06-30 ACA899 ATH → YUL Jun 30, 09:44 UTCJun 30, 18:39 UTC8h 55m
2026-06-29 ACA898 YUL → ATH Jun 29, 22:39 UTCJun 30, 07:15 UTC8h 36m
2026-06-29 ACA898 YUL → ATH Jun 29, 22:39 UTCJun 30, 07:02 UTC8h 23m
2026-06-29 ACA875 CDG → YUL Jun 29, 09:04 UTCJun 29, 15:53 UTC6h 49m
2026-06-28 ACA874 YUL → CDG Jun 28, 22:49 UTCJun 29, 05:00 UTC6h 10m
2026-06-28 ACA893 FCO → YUL Jun 28, 09:55 UTCJun 28, 16:45 UTC6h 50m
2026-06-28 ACA893 FCO → YUL Jun 28, 09:54 UTCJun 28, 17:46 UTC7h 52m
2026-06-28 ACA892 - Jun 28, 00:30 UTCJun 28, 07:40 UTC7h 10m
2026-06-27 ACA6 NRT → YUL Jun 27, 13:44 UTCJun 27, 20:44 UTC7h 0m
2026-06-27 ACA6 NRT → YUL Jun 27, 09:09 UTCJun 27, 09:29 UTC20m
2026-06-26 ACA5 - Jun 26, 17:29 UTCJun 26, 18:04 UTC35m
2026-06-26 ACA5 YUL → NRT Jun 26, 17:29 UTCJun 27, 06:02 UTC12h 33m
2026-06-26 ACA875 - Jun 26, 08:30 UTCJun 26, 15:25 UTC6h 55m

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 1h 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 18 distinct callsigns, including ACA875, ACA6, ACA893, ACA892, ACA874.