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sensors Mode-S transponder

7801AD

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-HYJ · AIRBUS A-330-300

Hex
7801AD
Octal
36000655
Decimal
7,864,749
Country
CN
Tail
B-HYJ
Type
A333
No current signal · last broadcast Jul 26, 15:25 UTC
Flights observed
339
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:25 UTC

Last known position

Most recent position reported by Mode-S 7801AD.

Country allocation

The ICAO 24-bit address 7801AD 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
CPA413 Cathay Pacific 11 2026-07-05
CPA364 - 10 2026-06-18
CPA597 Cathay Pacific 9 2026-07-20
CPA501 Cathay Pacific 9 2026-07-20
CPA393 - 9 2026-07-06
CPA365 Cathay Pacific 9 2026-07-24
CPA500 Cathay Pacific 7 2026-07-20
CPA430 Cathay Pacific 7 2026-07-25
CPA419 Cathay Pacific 7 2026-07-26
CPA392 - 7 2026-07-06
CPA912 - 6 2026-07-17
CPA780 Cathay Pacific 6 2026-07-23
CPA750 - 6 2026-07-02
CPA705 - 6 2026-07-02
CPA377 - 6 2026-07-01
CPA376 - 6 2026-07-18
CPA347 Cathay Pacific 6 2026-05-27
CPA331 - 6 2026-07-17
CPA725 - 5 2026-06-27
CPA654 - 5 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CPA419 ICN → HKG Jul 26, 14:55 UTCJul 26, 15:05 UTC10m
2026-07-26 CPA419 ICN → HKG Jul 26, 11:50 UTCJul 26, 14:15 UTC2h 25m
2026-07-25 CPA430 HKG → ICN Jul 25, 11:00 UTCJul 25, 14:15 UTC3h 15m
2026-07-24 CPA365 PVG → HKG Jul 24, 09:55 UTCJul 25, 04:55 UTC19h 0m
2026-07-24 CPA766 SGN → HKG Jul 24, 06:40 UTCJul 24, 07:00 UTC20m
2026-07-24 CPA767 HKG → SGN Jul 24, 00:50 UTCJul 24, 01:05 UTC15m
2026-07-23 CPA636 SIN → HKG Jul 23, 15:40 UTCJul 23, 15:55 UTC15m
2026-07-23 CPA636 SIN → HKG Jul 23, 12:30 UTCJul 23, 12:55 UTC25m
2026-07-23 CPA635 HKG → SIN Jul 23, 10:15 UTCJul 23, 10:40 UTC25m
2026-07-23 CPA635 HKG → SIN Jul 23, 07:35 UTCJul 23, 07:40 UTC5m
2026-07-23 CPA780 SUB → HKG Jul 23, 05:20 UTCJul 23, 05:35 UTC15m
2026-07-23 CPA780 SUB → HKG Jul 23, 02:55 UTCJul 23, 03:25 UTC30m
2026-07-22 CPA431 KHH → HKG Jul 22, 03:50 UTCJul 22, 05:05 UTC1h 15m
2026-07-22 CPA432 HKG → KHH Jul 22, 01:20 UTCJul 22, 02:25 UTC1h 5m
2026-07-21 CPA634 - Jul 21, 08:40 UTCJul 21, 08:55 UTC15m
2026-07-21 CPA633 HKG → PEN Jul 21, 00:35 UTCJul 21, 00:50 UTC15m
2026-07-20 CPA501 NRT → HKG Jul 20, 13:15 UTCJul 20, 17:05 UTC3h 50m
2026-07-20 CPA500 HKG → NRT Jul 20, 07:30 UTCJul 20, 11:30 UTC4h 0m
2026-07-20 CPA597 KIX → HKG Jul 20, 03:30 UTCJul 20, 03:40 UTC10m
2026-07-20 CPA597 KIX → HKG Jul 20, 00:20 UTCJul 20, 02:55 UTC2h 35m
2026-07-19 CPA566 HKG → KIX Jul 19, 18:15 UTCJul 19, 21:35 UTC3h 20m
2026-07-19 CPA469 TPE → HKG Jul 19, 14:30 UTCJul 19, 15:45 UTC1h 15m
2026-07-19 CPA464 HKG → TPE Jul 19, 11:55 UTCJul 19, 13:20 UTC1h 25m
2026-07-19 CPA951 HKG → HKG Jul 19, 02:30 UTCJul 19, 09:50 UTC7h 20m
2026-07-18 CPA376 HKG → HKG Jul 18, 03:15 UTCJul 18, 09:35 UTC6h 20m
2026-07-17 CPA331 - Jul 17, 09:50 UTCJul 17, 12:45 UTC2h 55m
2026-07-17 CPA332 - Jul 17, 04:35 UTCJul 17, 04:54 UTC20m
2026-07-17 CPA912 - Jul 17, 00:10 UTCJul 17, 01:59 UTC1h 50m
2026-07-16 CPA939 - Jul 16, 15:55 UTCJul 16, 17:45 UTC1h 50m
2026-07-16 CPA957 - Jul 16, 12:49 UTCJul 16, 13:15 UTC25m
2026-07-16 CPA952 - Jul 16, 07:40 UTCJul 16, 07:55 UTC15m
2026-07-16 CPA983 - Jul 16, 04:05 UTCJul 16, 04:45 UTC40m
2026-07-16 CPA982 - Jul 16, 01:05 UTCJul 16, 01:20 UTC15m
2026-07-15 CPA597 - Jul 15, 00:15 UTCJul 15, 03:35 UTC3h 20m
2026-07-14 CPA566 HKG → KIX Jul 14, 18:20 UTCJul 14, 21:45 UTC3h 25m
2026-07-14 CPA459 KHH → HKG Jul 14, 12:10 UTCJul 14, 13:30 UTC1h 20m
2026-07-14 CPA458 HKG → KHH Jul 14, 09:40 UTCJul 14, 10:45 UTC1h 5m
2026-07-14 CPA608 - Jul 14, 07:25 UTCJul 14, 07:45 UTC20m
2026-07-14 CPA607 - Jul 14, 01:35 UTCJul 14, 01:50 UTC15m
2026-07-10 CPA376 - Jul 10, 03:15 UTCJul 10, 09:05 UTC5h 50m
2026-07-09 CPA331 - Jul 9, 11:35 UTCJul 9, 12:10 UTC35m
2026-07-09 CPA331 - Jul 9, 09:20 UTCJul 9, 09:35 UTC15m
2026-07-09 CPA332 - Jul 9, 07:00 UTCJul 9, 07:10 UTC10m
2026-07-09 CPA332 - Jul 9, 04:20 UTCJul 9, 04:35 UTC15m
2026-07-08 CPA539 - Jul 8, 10:55 UTCJul 8, 11:15 UTC20m
2026-07-08 CPA539 - Jul 8, 07:50 UTCJul 8, 10:25 UTC2h 35m
2026-07-08 CPA536 - Jul 8, 02:40 UTCJul 8, 06:00 UTC3h 20m
2026-07-07 CPA634 - Jul 7, 09:50 UTCJul 7, 10:05 UTC15m
2026-07-07 CPA634 - Jul 7, 06:30 UTCJul 7, 06:40 UTC10m
2026-07-07 CPA633 - Jul 7, 04:45 UTCJul 7, 04:55 UTC10m

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

Mode-S 7801AD frequently asked

What is Mode-S code 7801AD?
7801AD is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HYJ.
Where is Mode-S 7801AD registered?
Mode-S code 7801AD is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7801AD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7801AD, octal 36000655, decimal 7,864,749.
What flights does 7801AD operate?
Mode-S 7801AD has broadcast 20 distinct callsigns, including CPA413, CPA364, CPA597, CPA501, CPA393.