sensors Mode-S transponder

780A3B

ICAO 24-bit transponder address · allocated to China

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

Hex
780A3B
Octal
36005073
Decimal
7,866,939
Country
CN
Tail
B-KQI
Type
B77W
No current signal · last broadcast 2h ago
Flights observed
105
Distinct callsigns
18
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 780A3B.

Country allocation

The ICAO 24-bit address 780A3B 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 18 distinct

Callsign Airline Flights Last seen
CPA253 Cathay Pacific 13 2026-05-25
CPA251 Cathay Pacific 12 2026-05-15
CPA254 Cathay Pacific 11 2026-05-26
CPA252 Cathay Pacific 9 2026-05-15
CPA234 Cathay Pacific 9 2026-05-22
CPA233 Cathay Pacific 9 2026-05-21
CPA882 Cathay Pacific 6 2026-05-29
CPA881 Cathay Pacific 6 2026-05-28
CPA880 Cathay Pacific 6 2026-05-27
CPA391 Cathay Pacific 5 2026-05-27
CPA831 Cathay Pacific 4 2026-05-12
CPA390 Cathay Pacific 4 2026-05-27
CPA883 Cathay Pacific 3 2026-05-02
CPA830 Cathay Pacific 3 2026-05-12
CPA774 Cathay Pacific 2 2026-04-29
CPA717 Cathay Pacific 1 2026-04-29
CPA139 Cathay Pacific 1 2026-04-22
CPA138 Cathay Pacific 1 2026-04-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CPA882 HKG → LAX May 29, 10:40 UTCMay 29, 22:45 UTC12h 5m
2026-05-28 CPA881 LAX → HKG May 28, 07:35 UTCMay 28, 21:40 UTC14h 5m
2026-05-27 CPA880 HKG → LAX May 27, 16:25 UTCMay 28, 05:05 UTC12h 40m
2026-05-27 CPA391 PEK → HKG May 27, 08:45 UTCMay 27, 09:20 UTC35m
2026-05-27 CPA390 HKG → PEK May 27, 01:19 UTCMay 27, 06:40 UTC5h 20m
2026-05-26 CPA254 LHR → HKG May 26, 09:19 UTCMay 26, 09:59 UTC40m
2026-05-25 CPA254 LHR → HKG May 25, 21:45 UTCMay 26, 02:15 UTC4h 30m
2026-05-25 CPA253 HKG → LHR May 25, 14:05 UTCMay 25, 19:00 UTC4h 55m
2026-05-25 CPA253 HKG → LHR May 25, 05:55 UTCMay 25, 06:10 UTC15m
2026-05-24 CPA881 LAX → HKG May 24, 07:50 UTCMay 24, 21:45 UTC13h 55m
2026-05-23 CPA880 HKG → LAX May 23, 16:25 UTCMay 24, 05:00 UTC12h 35m
2026-05-23 CPA391 PEK → HKG May 23, 01:30 UTCMay 23, 09:00 UTC7h 30m
2026-05-22 CPA234 MXP → HKG May 22, 22:00 UTCMay 22, 22:30 UTC30m
2026-05-22 CPA234 MXP → HKG May 22, 11:05 UTCMay 22, 14:55 UTC3h 50m
2026-05-21 CPA233 HKG → MXP May 21, 22:40 UTCMay 22, 05:50 UTC7h 10m
2026-05-21 CPA233 HKG → MXP May 21, 17:10 UTCMay 21, 17:30 UTC20m
2026-05-21 CPA391 PEK → HKG May 21, 07:00 UTCMay 21, 10:25 UTC3h 25m
2026-05-21 CPA390 HKG → PEK May 21, 04:25 UTCMay 21, 04:35 UTC10m
2026-05-21 CPA390 HKG → PEK May 21, 01:50 UTCMay 21, 02:10 UTC20m
2026-05-19 CPA234 MXP → HKG May 19, 22:05 UTCMay 19, 22:50 UTC45m
2026-05-19 CPA234 MXP → HKG May 19, 11:10 UTCMay 19, 14:50 UTC3h 40m
2026-05-19 CPA233 HKG → MXP May 19, 01:50 UTCMay 19, 05:55 UTC4h 5m
2026-05-18 CPA233 HKG → MXP May 18, 17:20 UTCMay 18, 17:40 UTC20m
2026-05-17 CPA881 LAX → HKG May 17, 07:45 UTCMay 17, 21:45 UTC14h 0m
2026-05-16 CPA880 HKG → LAX May 16, 16:35 UTCMay 17, 05:00 UTC12h 25m
2026-05-16 CPA391 PEK → HKG May 16, 01:15 UTCMay 16, 09:16 UTC8h 1m
2026-05-15 CPA252 LHR → HKG May 15, 11:40 UTCMay 15, 23:25 UTC11h 44m
2026-05-15 CPA251 HKG → LHR May 15, 03:20 UTCMay 15, 05:35 UTC2h 15m
2026-05-14 CPA251 HKG → LHR May 14, 16:20 UTCMay 14, 16:35 UTC15m
2026-05-12 CPA831 JFK → HKG May 12, 19:10 UTCMay 12, 20:35 UTC1h 25m
2026-05-12 CPA830 HKG → JFK May 12, 03:00 UTCMay 12, 16:15 UTC13h 15m
2026-05-11 CPA881 LAX → HKG May 11, 07:35 UTCMay 11, 21:55 UTC14h 20m
2026-05-10 CPA880 HKG → LAX May 10, 16:20 UTCMay 11, 04:10 UTC11h 50m
2026-05-10 CPA831 JFK → HKG May 10, 10:10 UTCMay 10, 10:40 UTC30m
2026-05-09 CPA831 JFK → HKG May 9, 19:30 UTCMay 10, 06:30 UTC11h 0m
2026-05-09 CPA830 HKG → JFK May 9, 01:25 UTCMay 9, 16:15 UTC14h 50m
2026-05-08 CPA881 LAX → HKG May 8, 07:39 UTCMay 8, 22:35 UTC14h 55m
2026-05-07 CPA880 HKG → LAX May 7, 16:40 UTCMay 8, 05:00 UTC12h 19m
2026-05-06 CPA254 LHR → HKG May 6, 21:40 UTCMay 7, 09:50 UTC12h 10m
2026-05-06 CPA253 HKG → LHR May 6, 14:15 UTCMay 6, 19:30 UTC5h 14m
2026-05-06 CPA253 HKG → LHR May 6, 05:50 UTCMay 6, 06:05 UTC15m
2026-05-05 CPA252 LHR → HKG May 5, 23:15 UTCMay 5, 23:45 UTC30m
2026-05-05 CPA252 LHR → HKG May 5, 11:45 UTCMay 5, 16:20 UTC4h 35m
2026-05-04 CPA251 HKG → LHR May 4, 23:55 UTCMay 5, 04:50 UTC4h 55m
2026-05-04 CPA251 HKG → LHR May 4, 15:15 UTCMay 4, 15:35 UTC20m
2026-05-04 CPA254 LHR → HKG May 4, 09:40 UTCMay 4, 10:05 UTC25m
2026-05-03 CPA254 LHR → HKG May 3, 21:54 UTCMay 4, 00:50 UTC2h 55m
2026-05-03 CPA253 HKG → LHR May 3, 14:20 UTCMay 3, 19:10 UTC4h 50m
2026-05-03 CPA253 HKG → LHR May 3, 06:05 UTCMay 3, 06:15 UTC10m
2026-05-02 CPA883 LAX → HKG May 2, 06:55 UTCMay 2, 21:40 UTC14h 45m

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-KQI page for operator, model, and routing details .

Mode-S 780A3B frequently asked

What is Mode-S code 780A3B?
780A3B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-KQI.
Where is Mode-S 780A3B registered?
Mode-S code 780A3B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780A3B 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 780A3B, octal 36005073, decimal 7,866,939.
What flights does 780A3B operate?
Mode-S 780A3B has broadcast 18 distinct callsigns, including CPA253, CPA251, CPA254, CPA252, CPA234.