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
Broadcasting now · callsign CPA251 · 36,000 ft
Flights observed
204
Distinct callsigns
19
Country
CN
Last broadcast
Jul 26, 22:40 UTC

Current position

780A3C is currently broadcasting. Map zoomed to live position.

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
CPA253 - 22 2026-07-20
CPA831 Cathay Pacific 20 2026-07-22
CPA830 Cathay Pacific 20 2026-07-22
CPA880 Cathay Pacific 18 2026-07-25
CPA881 Cathay Pacific 17 2026-07-26
CPA251 - 17 2026-07-08
CPA254 Cathay Pacific 16 2026-07-21
CPA391 Cathay Pacific 15 2026-07-25
CPA252 - 11 2026-07-09
CPA234 Cathay Pacific 11 2026-06-02
CPA390 Cathay Pacific 10 2026-07-25
CPA233 Cathay Pacific 10 2026-06-02
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
2026-07-26 CPA881 LAX → HKG Jul 26, 08:40 UTCJul 26, 22:30 UTC13h 50m
2026-07-25 CPA880 HKG → LAX Jul 25, 16:35 UTCJul 26, 05:30 UTC12h 55m
2026-07-25 CPA391 PEK → HKG Jul 25, 10:50 UTCJul 25, 11:00 UTC10m
2026-07-25 CPA391 PEK → HKG Jul 25, 09:25 UTCJul 25, 09:35 UTC10m
2026-07-25 CPA391 PEK → HKG Jul 25, 06:30 UTCJul 25, 06:50 UTC20m
2026-07-25 CPA390 HKG → PEK Jul 25, 03:55 UTCJul 25, 04:25 UTC30m
2026-07-25 CPA390 HKG → PEK Jul 25, 02:00 UTCJul 25, 02:15 UTC15m
2026-07-24 CPA881 LAX → HKG Jul 24, 08:40 UTCJul 24, 22:00 UTC13h 20m
2026-07-23 CPA880 HKG → LAX Jul 23, 16:50 UTCJul 24, 05:50 UTC13h 0m
2026-07-22 CPA831 JFK → HKG Jul 22, 19:10 UTCJul 23, 10:30 UTC15h 20m
2026-07-22 CPA830 HKG → JFK Jul 22, 01:30 UTCJul 22, 16:30 UTC15h 0m
2026-07-21 CPA254 LHR → HKG Jul 21, 08:55 UTCJul 21, 09:30 UTC35m
2026-07-20 CPA254 LHR → HKG Jul 20, 21:55 UTCJul 21, 02:05 UTC4h 9m
2026-07-20 CPA253 - Jul 20, 14:30 UTCJul 20, 19:40 UTC5h 10m
2026-07-20 CPA253 - Jul 20, 05:45 UTCJul 20, 06:00 UTC15m
2026-07-19 CPA881 - Jul 19, 10:55 UTCJul 20, 00:20 UTC13h 25m
2026-07-18 CPA880 - Jul 18, 16:35 UTCJul 19, 05:40 UTC13h 5m
2026-07-17 CPA831 JFK → HKG Jul 17, 19:35 UTCJul 18, 11:10 UTC15h 36m
2026-07-17 CPA830 HKG → JFK Jul 17, 01:55 UTCJul 17, 17:25 UTC15h 30m
2026-07-16 CPA254 - Jul 16, 08:55 UTCJul 16, 09:35 UTC40m
2026-07-15 CPA254 - Jul 15, 21:50 UTCJul 16, 02:00 UTC4h 10m
2026-07-15 CPA253 - Jul 15, 14:35 UTCJul 15, 19:35 UTC5h 0m
2026-07-15 CPA253 - Jul 15, 06:35 UTCJul 15, 06:50 UTC15m
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

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?
Yes. Mode-S 780A3C is currently airborne.
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 CPA253, CPA831, CPA830, CPA880, CPA881.