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 2h ago
Flights observed
101
Distinct callsigns
16
Country
CN
Last broadcast
2h ago

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 16 distinct

Callsign Airline Flights Last seen
CPA830 Cathay Pacific 15 2026-05-30
CPA253 Cathay Pacific 12 2026-05-17
CPA251 Cathay Pacific 12 2026-05-25
CPA831 Cathay Pacific 11 2026-05-28
CPA254 Cathay Pacific 9 2026-05-18
CPA252 Cathay Pacific 7 2026-05-25
CPA881 Cathay Pacific 5 2026-05-21
CPA880 Cathay Pacific 5 2026-05-20
CPA391 Cathay Pacific 5 2026-05-22
CPA883 Cathay Pacific 4 2026-05-23
CPA234 Cathay Pacific 4 2026-05-03
CPA882 Cathay Pacific 3 2026-05-22
CPA390 Cathay Pacific 3 2026-05-22
CPA233 Cathay Pacific 3 2026-05-03
CPA421 Cathay Pacific 2 2026-04-30
CPA420 Cathay Pacific 1 2026-04-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CPA830 HKG → JFK May 30, 01:30 UTCMay 30, 02:45 UTC1h 15m
2026-05-28 CPA831 JFK → HKG May 28, 19:10 UTCMay 29, 10:25 UTC15h 15m
2026-05-28 CPA830 HKG → JFK May 28, 01:25 UTCMay 28, 16:45 UTC15h 20m
2026-05-26 CPA831 JFK → HKG May 26, 20:45 UTCMay 27, 12:15 UTC15h 31m
2026-05-26 CPA830 HKG → JFK May 26, 02:44 UTCMay 26, 18:30 UTC15h 45m
2026-05-25 CPA252 LHR → HKG May 25, 23:30 UTCMay 26, 00:09 UTC40m
2026-05-25 CPA252 LHR → HKG May 25, 11:45 UTCMay 25, 14:40 UTC2h 55m
2026-05-25 CPA251 HKG → LHR May 25, 02:10 UTCMay 25, 05:00 UTC2h 50m
2026-05-24 CPA251 HKG → LHR May 24, 15:45 UTCMay 24, 16:05 UTC20m
2026-05-23 CPA883 LAX → HKG May 23, 06:55 UTCMay 23, 21:10 UTC14h 16m
2026-05-22 CPA882 HKG → LAX May 22, 11:05 UTCMay 22, 23:15 UTC12h 10m
2026-05-22 CPA391 PEK → HKG May 22, 08:30 UTCMay 22, 09:10 UTC40m
2026-05-22 CPA390 HKG → PEK May 22, 01:20 UTCMay 22, 01:35 UTC15m
2026-05-21 CPA881 LAX → HKG May 21, 07:55 UTCMay 21, 22:00 UTC14h 5m
2026-05-20 CPA880 HKG → LAX May 20, 16:40 UTCMay 21, 04:55 UTC12h 15m
2026-05-20 CPA391 PEK → HKG May 20, 06:10 UTCMay 20, 09:10 UTC3h 0m
2026-05-20 CPA390 HKG → PEK May 20, 01:45 UTCMay 20, 02:00 UTC15m
2026-05-19 CPA252 LHR → HKG May 19, 11:40 UTCMay 19, 23:55 UTC12h 15m
2026-05-18 CPA251 HKG → LHR May 18, 23:45 UTCMay 19, 04:45 UTC5h 0m
2026-05-18 CPA251 HKG → LHR May 18, 15:15 UTCMay 18, 15:35 UTC20m
2026-05-18 CPA254 LHR → HKG May 18, 09:15 UTCMay 18, 09:40 UTC25m
2026-05-17 CPA254 LHR → HKG May 17, 21:30 UTCMay 18, 02:25 UTC4h 55m
2026-05-17 CPA253 HKG → LHR May 17, 14:10 UTCMay 17, 19:15 UTC5h 5m
2026-05-17 CPA253 HKG → LHR May 17, 05:40 UTCMay 17, 05:55 UTC15m
2026-05-16 CPA883 LAX → HKG May 16, 21:20 UTCMay 16, 21:40 UTC20m
2026-05-16 CPA883 LAX → HKG May 16, 06:55 UTCMay 16, 20:45 UTC13h 50m
2026-05-15 CPA882 HKG → LAX May 15, 12:30 UTCMay 16, 00:35 UTC12h 4m
2026-05-14 CPA831 JFK → HKG May 14, 19:10 UTCMay 15, 10:25 UTC15h 15m
2026-05-14 CPA830 HKG → JFK May 14, 01:50 UTCMay 14, 16:50 UTC15h 0m
2026-05-12 CPA254 LHR → HKG May 12, 21:30 UTCMay 13, 09:25 UTC11h 55m
2026-05-12 CPA253 HKG → LHR May 12, 05:45 UTCMay 12, 15:20 UTC9h 35m
2026-05-11 CPA252 LHR → HKG May 11, 12:00 UTCMay 11, 16:30 UTC4h 30m
2026-05-10 CPA251 HKG → LHR May 10, 20:30 UTCMay 11, 04:45 UTC8h 15m
2026-05-10 CPA251 HKG → LHR May 10, 15:19 UTCMay 10, 15:35 UTC15m
2026-05-09 CPA254 LHR → HKG May 9, 21:45 UTCMay 10, 09:50 UTC12h 5m
2026-05-09 CPA253 HKG → LHR May 9, 14:35 UTCMay 9, 19:40 UTC5h 5m
2026-05-09 CPA253 HKG → LHR May 9, 05:50 UTCMay 9, 06:10 UTC20m
2026-05-07 CPA254 LHR → HKG May 7, 21:55 UTCMay 8, 10:09 UTC12h 14m
2026-05-07 CPA253 HKG → LHR May 7, 14:40 UTCMay 7, 19:35 UTC4h 55m
2026-05-07 CPA253 HKG → LHR May 7, 06:00 UTCMay 7, 06:15 UTC15m
2026-05-06 CPA252 LHR → HKG May 6, 11:35 UTCMay 6, 23:35 UTC11h 59m
2026-05-06 CPA251 HKG → LHR May 6, 00:20 UTCMay 6, 04:55 UTC4h 34m
2026-05-05 CPA251 HKG → LHR May 5, 15:15 UTCMay 5, 15:35 UTC20m
2026-05-04 CPA831 JFK → HKG May 4, 19:15 UTCMay 5, 10:25 UTC15h 10m
2026-05-04 CPA830 HKG → JFK May 4, 01:24 UTCMay 4, 16:00 UTC14h 35m
2026-05-03 CPA234 MXP → HKG May 3, 21:50 UTCMay 3, 22:15 UTC25m
2026-05-03 CPA234 MXP → HKG May 3, 10:55 UTCMay 3, 14:45 UTC3h 50m
2026-05-03 CPA233 HKG → MXP May 3, 01:50 UTCMay 3, 05:55 UTC4h 4m
2026-05-02 CPA233 HKG → MXP May 2, 17:25 UTCMay 2, 17:40 UTC15m
2026-05-01 CPA831 JFK → HKG May 1, 19:05 UTCMay 2, 10:15 UTC15h 10m

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 2h ago.
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 16 distinct callsigns, including CPA830, CPA253, CPA251, CPA831, CPA254.