Apparatus

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sensors Mode-S transponder

78023D

ICAO 24-bit transponder address · allocated to China

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

Hex
78023D
Octal
36001075
Decimal
7,864,893
Country
CN
Tail
B-KPQ
Type
B77W
No current signal · last broadcast Jul 26, 20:20 UTC
Flights observed
206
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 20:20 UTC

Last known position

Most recent position reported by Mode-S 78023D.

Country allocation

The ICAO 24-bit address 78023D 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 20 distinct

Callsign Airline Flights Last seen
CPA830 Cathay Pacific 32 2026-07-25
CPA831 Cathay Pacific 27 2026-07-26
CPA251 - 22 2026-07-12
CPA881 Cathay Pacific 20 2026-07-23
CPA880 Cathay Pacific 17 2026-07-22
CPA253 - 14 2026-07-16
CPA252 - 14 2026-07-13
CPA391 Cathay Pacific 12 2026-07-24
CPA254 - 11 2026-07-17
CPA390 Cathay Pacific 10 2026-07-24
CPA883 Cathay Pacific 4 2026-05-23
CPA234 Cathay Pacific 4 2026-05-03
CPA882 Cathay Pacific 3 2026-05-22
CPA683 Cathay Pacific 3 2026-07-24
CPA233 Cathay Pacific 3 2026-05-03
CPA696 Cathay Pacific 2 2026-07-24
CPA654 - 2 2026-07-05
CPA421 Cathay Pacific 2 2026-04-30
CPA653 - 1 2026-07-05
CPA420 Cathay Pacific 1 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CPA831 JFK → HKG Jul 26, 19:15 UTCJul 26, 20:20 UTC1h 5m
2026-07-25 CPA830 HKG → JFK Jul 25, 03:40 UTCJul 25, 19:00 UTC15h 20m
2026-07-24 CPA696 BOM → HKG Jul 24, 23:40 UTCJul 25, 00:00 UTC20m
2026-07-24 CPA696 BOM → HKG Jul 24, 20:20 UTCJul 24, 22:05 UTC1h 45m
2026-07-24 CPA683 HKG → BOM Jul 24, 16:40 UTCJul 24, 17:05 UTC25m
2026-07-24 CPA683 HKG → BOM Jul 24, 14:15 UTCJul 24, 15:20 UTC1h 5m
2026-07-24 CPA683 HKG → BOM Jul 24, 11:45 UTCJul 24, 11:55 UTC10m
2026-07-24 CPA391 PEK → HKG Jul 24, 06:40 UTCJul 24, 09:35 UTC2h 55m
2026-07-24 CPA390 HKG → PEK Jul 24, 01:15 UTCJul 24, 01:35 UTC20m
2026-07-23 CPA881 LAX → HKG Jul 23, 08:30 UTCJul 23, 22:05 UTC13h 35m
2026-07-22 CPA880 HKG → LAX Jul 22, 16:25 UTCJul 23, 05:30 UTC13h 5m
2026-07-22 CPA390 HKG → PEK Jul 22, 01:35 UTCJul 22, 01:45 UTC10m
2026-07-21 CPA831 JFK → HKG Jul 21, 11:55 UTCJul 21, 12:30 UTC35m
2026-07-20 CPA831 JFK → HKG Jul 20, 20:45 UTCJul 21, 09:50 UTC13h 4m
2026-07-20 CPA830 HKG → JFK Jul 20, 02:30 UTCJul 20, 17:55 UTC15h 25m
2026-07-18 CPA831 JFK → HKG Jul 18, 21:25 UTCJul 19, 12:55 UTC15h 30m
2026-07-18 CPA830 HKG → JFK Jul 18, 01:45 UTCJul 18, 17:45 UTC16h 1m
2026-07-17 CPA254 - Jul 17, 09:45 UTCJul 17, 10:30 UTC45m
2026-07-16 CPA254 - Jul 16, 22:35 UTCJul 17, 02:50 UTC4h 15m
2026-07-16 CPA253 - Jul 16, 14:29 UTCJul 16, 19:50 UTC5h 20m
2026-07-16 CPA253 - Jul 16, 05:55 UTCJul 16, 06:15 UTC20m
2026-07-15 CPA881 - Jul 15, 08:35 UTCJul 15, 22:10 UTC13h 35m
2026-07-14 CPA880 HKG → LAX Jul 14, 16:40 UTCJul 15, 06:00 UTC13h 19m
2026-07-14 CPA391 - Jul 14, 06:05 UTCJul 14, 09:10 UTC3h 5m
2026-07-14 CPA390 - Jul 14, 01:40 UTCJul 14, 01:55 UTC15m
2026-07-13 CPA252 - Jul 13, 23:15 UTCJul 13, 23:35 UTC20m
2026-07-13 CPA252 - Jul 13, 12:05 UTCJul 13, 15:00 UTC2h 55m
2026-07-12 CPA251 - Jul 12, 23:30 UTCJul 13, 04:35 UTC5h 5m
2026-07-12 CPA251 - Jul 12, 15:20 UTCJul 12, 15:35 UTC15m
2026-07-11 CPA252 - Jul 11, 22:50 UTCJul 11, 23:20 UTC30m
2026-07-11 CPA252 - Jul 11, 11:45 UTCJul 11, 14:40 UTC2h 55m
2026-07-10 CPA251 - Jul 10, 20:25 UTCJul 11, 04:50 UTC8h 25m
2026-07-10 CPA251 - Jul 10, 15:25 UTCJul 10, 15:45 UTC20m
2026-07-10 CPA391 - Jul 10, 06:30 UTCJul 10, 09:20 UTC2h 50m
2026-07-10 CPA390 - Jul 10, 01:30 UTCJul 10, 01:45 UTC15m
2026-07-09 CPA881 - Jul 9, 08:50 UTCJul 9, 22:55 UTC14h 5m
2026-07-08 CPA880 - Jul 8, 16:45 UTCJul 9, 05:35 UTC12h 50m
2026-07-07 CPA831 JFK → HKG Jul 7, 21:10 UTCJul 8, 12:20 UTC15h 10m
2026-07-07 CPA830 HKG → JFK Jul 7, 02:50 UTCJul 7, 18:35 UTC15h 45m
2026-07-06 CPA252 LHR → HKG Jul 6, 11:35 UTCJul 6, 23:15 UTC11h 40m
2026-07-05 CPA251 HKG → LHR Jul 5, 23:20 UTCJul 6, 04:35 UTC5h 15m
2026-07-05 CPA251 HKG → LHR Jul 5, 15:10 UTCJul 5, 15:25 UTC15m
2026-07-05 CPA654 - Jul 5, 10:25 UTCJul 5, 10:45 UTC20m
2026-07-05 CPA654 - Jul 5, 08:15 UTCJul 5, 09:05 UTC50m
2026-07-05 CPA653 - Jul 5, 04:15 UTCJul 5, 06:35 UTC2h 20m
2026-07-04 CPA881 LAX → HKG Jul 4, 08:45 UTCJul 4, 22:40 UTC13h 55m
2026-07-03 CPA880 HKG → LAX Jul 3, 16:30 UTCJul 4, 05:00 UTC12h 30m
2026-07-02 CPA831 JFK → HKG Jul 2, 19:35 UTCJul 3, 11:05 UTC15h 30m
2026-07-02 CPA830 HKG → JFK Jul 2, 02:20 UTCJul 2, 16:55 UTC14h 35m
2026-07-02 CPA830 HKG → JFK Jul 2, 01:30 UTCJul 2, 01:50 UTC20m

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

Mode-S 78023D frequently asked

What is Mode-S code 78023D?
78023D is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-KPQ.
Where is Mode-S 78023D registered?
Mode-S code 78023D is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 78023D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 78023D, octal 36001075, decimal 7,864,893.
What flights does 78023D operate?
Mode-S 78023D has broadcast 20 distinct callsigns, including CPA830, CPA831, CPA251, CPA881, CPA880.