Apparatus

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sensors Mode-S transponder

780A3C

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-KQJ · BOEING 777-300ER

Hex
780A3C
Octal
36005074
Decimal
7,866,940
Country
CN
Tail
B-KQJ
Type
B77W
No current signal · last broadcast 10h ago
Flights observed
181
Distinct callsigns
19
Country
CN
Last broadcast
10h ago

Last known position

Most recent position reported by Mode-S 780A3C.

Country allocation

The ICAO 24-bit address 780A3C falls within the block assigned to China (CN) by ICAO Annex 10, Volume III. Every aircraft registered in China 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 19 distinct

Callsign Airline Flights Last seen
CPA831 - 18 2026-07-14
CPA830 - 18 2026-07-13
CPA253 - 18 2026-07-10
CPA251 - 17 2026-07-08
CPA880 - 15 2026-07-11
CPA881 - 14 2026-07-12
CPA391 - 12 2026-07-08
CPA254 - 12 2026-07-11
CPA252 - 11 2026-07-09
CPA234 Cathay Pacific 11 2026-06-02
CPA233 Cathay Pacific 10 2026-06-02
CPA390 - 8 2026-07-08
CPA104 - 4 2026-06-29
CPA743 - 3 2026-06-28
CPA742 - 2 2026-06-28
CPA289 Cathay Pacific 2 2026-07-07
CPA288 Cathay Pacific 2 2026-07-07
CPA254D Cathay Pacific 2 2026-05-13
CPA105 Cathay Pacific 2 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CPA831 - Jul 14, 01:40 UTCJul 14, 10:50 UTC9h 10m
2026-07-13 CPA831 - Jul 13, 19:20 UTCJul 13, 20:45 UTC1h 25m
2026-07-13 CPA830 - Jul 13, 01:35 UTCJul 13, 17:05 UTC15h 30m
2026-07-12 CPA881 - Jul 12, 09:10 UTCJul 12, 22:40 UTC13h 30m
2026-07-11 CPA880 - Jul 11, 17:15 UTCJul 12, 05:30 UTC12h 15m
2026-07-11 CPA880 - Jul 11, 16:25 UTCJul 11, 16:40 UTC15m
2026-07-11 CPA254 - Jul 11, 08:35 UTCJul 11, 09:10 UTC35m
2026-07-10 CPA254 - Jul 10, 21:50 UTCJul 11, 00:35 UTC2h 45m
2026-07-10 CPA253 - Jul 10, 13:45 UTCJul 10, 19:30 UTC5h 45m
2026-07-10 CPA253 - Jul 10, 05:40 UTCJul 10, 05:55 UTC15m
2026-07-09 CPA252 LHR → HKG Jul 9, 11:35 UTCJul 9, 23:00 UTC11h 25m
2026-07-08 CPA251 HKG → LHR Jul 8, 15:10 UTCJul 9, 04:20 UTC13h 10m
2026-07-08 CPA391 - Jul 8, 08:45 UTCJul 8, 09:40 UTC55m
2026-07-08 CPA391 - Jul 8, 06:20 UTCJul 8, 06:35 UTC15m
2026-07-08 CPA390 - Jul 8, 01:25 UTCJul 8, 01:40 UTC15m
2026-07-07 CPA288 FRA → HKG Jul 7, 22:20 UTCJul 7, 22:55 UTC35m
2026-07-07 CPA288 FRA → HKG Jul 7, 12:00 UTCJul 7, 15:35 UTC3h 35m
2026-07-07 CPA289 HKG → FRA Jul 7, 01:35 UTCJul 7, 06:00 UTC4h 25m
2026-07-06 CPA289 HKG → FRA Jul 6, 17:20 UTCJul 6, 17:35 UTC15m
2026-07-05 CPA831 - Jul 5, 19:50 UTCJul 6, 11:25 UTC15h 35m
2026-07-05 CPA830 HKG → JFK Jul 5, 01:35 UTCJul 5, 16:50 UTC15h 15m
2026-07-04 CPA254 - Jul 4, 09:40 UTCJul 4, 10:25 UTC45m
2026-07-03 CPA254 - Jul 3, 22:30 UTCJul 4, 02:40 UTC4h 10m
2026-07-03 CPA253 HKG → LHR Jul 3, 15:10 UTCJul 3, 20:20 UTC5h 10m
2026-07-03 CPA253 HKG → LHR Jul 3, 06:55 UTCJul 3, 07:10 UTC15m
2026-07-01 CPA831 JFK → HKG Jul 1, 19:20 UTCJul 2, 10:35 UTC15h 15m
2026-07-01 CPA830 HKG → JFK Jul 1, 01:20 UTCJul 1, 16:45 UTC15h 25m
2026-06-30 CPA881 LAX → HKG Jun 30, 08:30 UTCJun 30, 22:15 UTC13h 45m
2026-06-29 CPA880 HKG → LAX Jun 29, 16:29 UTCJun 30, 04:50 UTC12h 21m
2026-06-29 CPA104 - Jun 29, 13:14 UTCJun 29, 13:34 UTC20m
2026-06-29 CPA104 - Jun 29, 04:45 UTCJun 29, 12:24 UTC7h 40m
2026-06-28 CPA105 HKG → MEL Jun 28, 18:19 UTCJun 29, 02:35 UTC8h 15m
2026-06-28 CPA742 - Jun 28, 14:50 UTCJun 28, 16:25 UTC1h 35m
2026-06-28 CPA743 - Jun 28, 09:39 UTCJun 28, 11:45 UTC2h 5m
2026-06-27 CPA881 LAX → HKG Jun 27, 08:44 UTCJun 27, 22:35 UTC13h 50m
2026-06-26 CPA880 HKG → LAX Jun 26, 16:20 UTCJun 27, 04:34 UTC12h 15m
2026-06-26 CPA831 - Jun 26, 10:05 UTCJun 26, 10:25 UTC20m
2026-06-25 CPA831 - Jun 25, 19:20 UTCJun 26, 08:00 UTC12h 40m
2026-06-25 CPA830 HKG → JFK Jun 25, 01:24 UTCJun 25, 16:29 UTC15h 5m
2026-06-24 CPA881 LAX → HKG Jun 24, 08:45 UTCJun 24, 22:55 UTC14h 10m
2026-06-23 CPA880 HKG → LAX Jun 23, 16:20 UTCJun 24, 04:24 UTC12h 5m
2026-06-22 CPA252 LHR → HKG Jun 22, 11:54 UTCJun 22, 23:35 UTC11h 40m
2026-06-21 CPA251 HKG → LHR Jun 21, 23:50 UTCJun 22, 04:54 UTC5h 5m
2026-06-21 CPA251 HKG → LHR Jun 21, 15:19 UTCJun 21, 15:34 UTC15m
2026-06-20 CPA831 JFK → HKG Jun 20, 19:24 UTCJun 21, 10:49 UTC15h 25m
2026-06-20 CPA830 HKG → JFK Jun 20, 02:35 UTCJun 20, 16:55 UTC14h 20m
2026-06-20 CPA830 HKG → JFK Jun 20, 01:44 UTCJun 20, 02:00 UTC15m
2026-06-19 CPA104 - Jun 19, 13:59 UTCJun 19, 14:24 UTC25m
2026-06-19 CPA104 - Jun 19, 05:45 UTCJun 19, 13:14 UTC7h 30m
2026-06-18 CPA105 HKG → MEL Jun 18, 19:15 UTCJun 19, 03:24 UTC8h 9m

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 B-KQJ page for operator, model, and routing details .

Mode-S 780A3C frequently asked

What is Mode-S code 780A3C?
780A3C is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-KQJ.
Where is Mode-S 780A3C registered?
Mode-S code 780A3C is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780A3C broadcasting right now?
No active broadcast right now. Last signal was 10h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780A3C, octal 36005074, decimal 7,866,940.
What flights does 780A3C operate?
Mode-S 780A3C has broadcast 19 distinct callsigns, including CPA831, CPA830, CPA253, CPA251, CPA880.