Apparatus

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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
Transponder active on ground
Flights observed
305
Distinct callsigns
20
Country
CN
Last broadcast
39m ago

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
CPA393 - 9 2026-07-06
CPA501 Cathay Pacific 8 2026-06-14
CPA365 - 8 2026-06-18
CPA392 - 7 2026-07-06
CPA750 - 6 2026-07-02
CPA705 - 6 2026-07-02
CPA597 - 6 2026-06-26
CPA500 - 6 2026-06-14
CPA430 - 6 2026-07-04
CPA377 - 6 2026-07-01
CPA347 Cathay Pacific 6 2026-05-27
CPA912 - 5 2026-06-29
CPA725 - 5 2026-06-27
CPA654 - 5 2026-06-29
CPA653 - 5 2026-06-29
CPA539 - 5 2026-07-08
CPA419 Cathay Pacific 5 2026-05-14
CPA376 - 5 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CPA566 - Jul 14, 18:20 UTCJul 14, 21:15 UTC2h 55m
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
2026-07-07 CPA633 - Jul 7, 01:50 UTCJul 7, 02:05 UTC15m
2026-07-06 CPA393 - Jul 6, 12:05 UTCJul 6, 15:10 UTC3h 5m
2026-07-06 CPA392 - Jul 6, 06:10 UTCJul 6, 06:25 UTC15m
2026-07-06 CPA407 TPE → HKG Jul 6, 00:10 UTCJul 6, 01:25 UTC1h 15m
2026-07-05 CPA408 HKG → TPE Jul 5, 15:05 UTCJul 5, 16:30 UTC1h 25m
2026-07-05 CPA961 - Jul 5, 09:35 UTCJul 5, 09:50 UTC15m
2026-07-05 CPA960 - Jul 5, 04:35 UTCJul 5, 04:50 UTC15m
2026-07-05 CPA413 ICN → HKG Jul 5, 02:20 UTCJul 5, 02:30 UTC10m
2026-07-04 CPA413 ICN → HKG Jul 4, 23:30 UTCJul 5, 01:45 UTC2h 15m
2026-07-04 CPA430 HKG → ICN Jul 4, 10:40 UTCJul 4, 13:40 UTC3h 0m
2026-07-04 CPA995 - Jul 4, 04:20 UTCJul 4, 05:10 UTC50m
2026-07-04 CPA914 - Jul 4, 01:05 UTCJul 4, 01:20 UTC15m
2026-07-02 CPA750 - Jul 2, 07:05 UTCJul 2, 07:10 UTC5m
2026-07-02 CPA750 - Jul 2, 04:50 UTCJul 2, 06:15 UTC1h 25m
2026-07-02 CPA705 - Jul 2, 03:10 UTCJul 2, 03:25 UTC15m
2026-07-02 CPA705 - Jul 2, 01:05 UTCJul 2, 02:10 UTC1h 5m
2026-07-01 CPA377 - Jul 1, 08:40 UTCJul 1, 09:00 UTC20m
2026-07-01 CPA377 - Jul 1, 04:00 UTCJul 1, 08:00 UTC4h 0m
2026-07-01 CPA376 - Jul 1, 02:55 UTCJul 1, 03:10 UTC15m
2026-06-30 CPA704 BKK → HKG Jun 30, 14:40 UTCJun 30, 14:45 UTC5m
2026-06-30 CPA704 BKK → HKG Jun 30, 12:25 UTCJun 30, 14:05 UTC1h 40m
2026-06-30 CPA701 - Jun 30, 09:40 UTCJun 30, 11:05 UTC1h 25m
2026-06-30 CPA701 - Jun 30, 08:45 UTCJun 30, 09:05 UTC20m
2026-06-30 CPA766 - Jun 30, 06:15 UTCJun 30, 06:35 UTC20m
2026-06-30 CPA767 - Jun 30, 00:45 UTCJun 30, 00:55 UTC10m
2026-06-29 CPA654 - Jun 29, 10:50 UTCJun 29, 10:55 UTC5m
2026-06-29 CPA654 - Jun 29, 08:39 UTCJun 29, 10:04 UTC1h 25m
2026-06-29 CPA653 HKG → BKK Jun 29, 04:50 UTCJun 29, 07:05 UTC2h 15m
2026-06-29 CPA912 - Jun 29, 00:24 UTCJun 29, 02:05 UTC1h 40m
2026-06-28 CPA939 HKG → MNL Jun 28, 14:34 UTCJun 28, 16:19 UTC1h 45m
2026-06-28 CPA776 - Jun 28, 12:25 UTCJun 28, 12:39 UTC15m
2026-06-28 CPA776 - Jun 28, 08:05 UTCJun 28, 09:39 UTC1h 35m
2026-06-28 CPA777 - Jun 28, 06:05 UTCJun 28, 06:20 UTC15m
2026-06-28 CPA777 - Jun 28, 02:05 UTCJun 28, 02:20 UTC15m

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?
Mode-S 7801AD is currently broadcasting from the ground.
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, CPA393, CPA501, CPA365.