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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 Jul 26, 18:00 UTC
Flights observed
299
Distinct callsigns
18
Country
CA
Last broadcast
Jul 26, 18:00 UTC

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 - 29 2026-07-15
ACA6 Air Canada 27 2026-07-25
ACA893 Air Canada 25 2026-07-26
ACA892 Air Canada 24 2026-07-25
ACA311 Air Canada 24 2026-07-21
ACA874 - 23 2026-07-14
ACA5 Air Canada 23 2026-07-24
ACA871 Air Canada 19 2026-07-20
ACA870 Air Canada 18 2026-07-20
ACA304 Air Canada 17 2026-07-22
ACA898 - 16 2026-07-15
ACA899 - 14 2026-07-16
ACA833 Air Canada 11 2026-07-24
ACA832 Air Canada 10 2026-07-23
ACA922 Air Canada 8 2026-04-20
ACA923 Air Canada 7 2026-04-20
ACA314 Air Canada 3 2026-04-15
ACA2311 - 1 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ACA893 FCO → YUL Jul 26, 10:00 UTCJul 26, 18:00 UTC8h 0m
2026-07-26 ACA893 FCO → YUL Jul 26, 09:58 UTCJul 26, 17:40 UTC7h 42m
2026-07-25 ACA892 YUL → FCO Jul 25, 23:45 UTCJul 26, 06:55 UTC7h 11m
2026-07-25 ACA6 NRT → YUL Jul 25, 09:00 UTCJul 25, 20:25 UTC11h 25m
2026-07-24 ACA5 YUL → NRT Jul 24, 17:20 UTCJul 25, 06:20 UTC13h 0m
2026-07-24 ACA833 BRU → YUL Jul 24, 08:00 UTCJul 24, 14:45 UTC6h 45m
2026-07-23 ACA832 YUL → BRU Jul 23, 23:30 UTCJul 24, 05:30 UTC6h 0m
2026-07-23 ACA893 FCO → YUL Jul 23, 10:30 UTCJul 23, 18:25 UTC7h 55m
2026-07-23 ACA892 YUL → FCO Jul 23, 00:05 UTCJul 23, 07:10 UTC7h 5m
2026-07-22 ACA304 YVR → YUL Jul 22, 16:20 UTCJul 22, 20:25 UTC4h 5m
2026-07-21 ACA311 YUL → YVR Jul 21, 22:05 UTCJul 22, 02:50 UTC4h 45m
2026-07-20 ACA871 CDG → YUL Jul 20, 13:15 UTCJul 20, 19:50 UTC6h 35m
2026-07-20 ACA871 CDG → YUL Jul 20, 13:11 UTCJul 20, 19:35 UTC6h 24m
2026-07-20 ACA870 YUL → CDG Jul 20, 02:20 UTCJul 20, 08:30 UTC6h 10m
2026-07-19 ACA6 - Jul 19, 09:25 UTCJul 19, 20:50 UTC11h 25m
2026-07-18 ACA5 - Jul 18, 17:15 UTCJul 18, 17:50 UTC35m
2026-07-18 ACA5 YUL → NRT Jul 18, 17:15 UTCJul 19, 05:46 UTC12h 31m
2026-07-18 ACA833 BRU → YUL Jul 18, 07:50 UTCJul 18, 08:45 UTC55m
2026-07-18 ACA833 BRU → YUL Jul 18, 07:49 UTCJul 18, 14:18 UTC6h 29m
2026-07-17 ACA832 YUL → BRU Jul 17, 23:14 UTCJul 18, 05:40 UTC6h 26m
2026-07-17 ACA304 YVR → YUL Jul 17, 16:15 UTCJul 17, 20:10 UTC3h 55m
2026-07-16 ACA311 - Jul 16, 22:05 UTCJul 16, 22:45 UTC40m
2026-07-16 ACA311 YUL → YVR Jul 16, 22:04 UTCJul 17, 02:47 UTC4h 43m
2026-07-16 ACA899 ATH → YUL Jul 16, 09:40 UTCJul 16, 19:14 UTC9h 35m
2026-07-15 ACA898 YUL → ATH Jul 15, 22:35 UTCJul 16, 07:05 UTC8h 30m
2026-07-15 ACA875 - Jul 15, 08:25 UTCJul 15, 10:00 UTC1h 35m
2026-07-15 ACA875 CDG → YUL Jul 15, 08:24 UTCJul 15, 15:06 UTC6h 42m
2026-07-14 ACA874 YUL → CDG Jul 14, 22:25 UTCJul 15, 04:35 UTC6h 9m
2026-07-14 ACA875 - Jul 14, 08:55 UTCJul 14, 15:35 UTC6h 40m
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

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 Jul 26, 18:00 UTC.
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, ACA311.