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
171
Distinct callsigns
20
Country
CN
Last broadcast
2h 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
CPA364 Cathay Pacific 8 2026-05-02
CPA501 Cathay Pacific 6 2026-05-27
CPA347 Cathay Pacific 6 2026-05-27
CPA500 Cathay Pacific 5 2026-05-27
CPA419 Cathay Pacific 5 2026-05-14
CPA413 Cathay Pacific 5 2026-05-18
CPA393 Cathay Pacific 5 2026-04-30
CPA392 Cathay Pacific 5 2026-04-30
CPA365 Cathay Pacific 5 2026-05-08
CPA912 Cathay Pacific 4 2026-05-08
CPA495 Cathay Pacific 4 2026-05-15
CPA418 Cathay Pacific 4 2026-05-14
CPA312 Cathay Pacific 4 2026-05-26
CPA725 Cathay Pacific 3 2026-05-04
CPA629 Cathay Pacific 3 2026-05-29
CPA430 Cathay Pacific 3 2026-05-17
CPA369 Cathay Pacific 3 2026-04-25
CPA906 Cathay Pacific 2 2026-05-14
CPA782 Cathay Pacific 2 2026-05-18
CPA780 Cathay Pacific 2 2026-05-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CPA629 HKG → SUB May 29, 07:05 UTCMay 30, 03:25 UTC20h 20m
2026-05-28 CPA327 SHA → HKG May 28, 10:50 UTCMay 28, 16:50 UTC6h 0m
2026-05-28 CPA634 PEN → HKG May 28, 08:25 UTCMay 28, 08:40 UTC15m
2026-05-28 CPA633 HKG → PEN May 28, 00:35 UTCMay 28, 00:50 UTC15m
2026-05-27 CPA501 NRT → HKG May 27, 17:00 UTCMay 27, 17:15 UTC15m
2026-05-27 CPA501 NRT → HKG May 27, 13:25 UTCMay 27, 16:25 UTC3h 0m
2026-05-27 CPA500 HKG → NRT May 27, 07:40 UTCMay 27, 11:40 UTC4h 0m
2026-05-27 CPA347 PEK → HKG May 27, 04:49 UTCMay 27, 05:29 UTC40m
2026-05-27 CPA347 PEK → HKG May 27, 02:19 UTCMay 27, 02:44 UTC25m
2026-05-26 CPA312 HKG → PEK May 26, 10:34 UTCMay 26, 10:50 UTC15m
2026-05-26 CPA377 PVG → HKG May 26, 03:35 UTCMay 26, 08:45 UTC5h 10m
2026-05-26 CPA376 HKG → PVG May 26, 02:35 UTCMay 26, 02:55 UTC20m
2026-05-24 CPA501 NRT → HKG May 24, 13:15 UTCMay 24, 17:20 UTC4h 5m
2026-05-24 CPA500 HKG → NRT May 24, 07:40 UTCMay 24, 11:30 UTC3h 50m
2026-05-24 CPA740 HAN → HKG May 24, 05:10 UTCMay 24, 05:45 UTC35m
2026-05-24 CPA741 HKG → HAN May 24, 01:05 UTCMay 24, 01:20 UTC15m
2026-05-23 CPA469 TPE → HKG May 23, 15:30 UTCMay 23, 15:45 UTC15m
2026-05-23 CPA469 TPE → HKG May 23, 14:30 UTCMay 23, 14:55 UTC25m
2026-05-23 CPA464 HKG → TPE May 23, 11:55 UTCMay 23, 13:25 UTC1h 30m
2026-05-23 CPA443 TPE → HKG May 23, 08:20 UTCMay 23, 09:40 UTC1h 20m
2026-05-23 CPA400 HKG → TPE May 23, 05:30 UTCMay 23, 07:05 UTC1h 35m
2026-05-23 CPA622 PEN → HKG May 23, 02:55 UTCMay 23, 03:15 UTC20m
2026-05-22 CPA621 HKG → PEN May 22, 07:45 UTCMay 22, 08:05 UTC20m
2026-05-22 CPA347 PEK → HKG May 22, 05:05 UTCMay 22, 05:40 UTC35m
2026-05-22 CPA347 PEK → HKG May 22, 02:30 UTCMay 22, 02:55 UTC25m
2026-05-21 CPA312 HKG → PEK May 21, 11:55 UTCMay 21, 12:05 UTC10m
2026-05-21 CPA312 HKG → PEK May 21, 09:25 UTCMay 21, 09:40 UTC15m
2026-05-20 CPA989 CAN → HKG May 20, 15:10 UTCMay 20, 15:40 UTC30m
2026-05-20 CPA988 HKG → CAN May 20, 12:25 UTCMay 20, 12:45 UTC20m
2026-05-20 CPA443 TPE → HKG May 20, 08:10 UTCMay 20, 09:30 UTC1h 20m
2026-05-20 CPA400 HKG → TPE May 20, 05:20 UTCMay 20, 06:45 UTC1h 25m
2026-05-19 CPA449 KHH → HKG May 19, 23:35 UTCMay 20, 00:35 UTC1h 0m
2026-05-19 CPA448 HKG → KHH May 19, 13:55 UTCMay 19, 14:55 UTC1h 0m
2026-05-18 CPA782 DPS → HKG May 18, 15:35 UTCMay 18, 16:05 UTC30m
2026-05-18 CPA782 DPS → HKG May 18, 06:55 UTCMay 18, 13:35 UTC6h 40m
2026-05-18 CPA783 HKG → DPS May 18, 04:55 UTCMay 18, 05:10 UTC15m
2026-05-18 CPA413 ICN → HKG May 18, 01:55 UTCMay 18, 02:15 UTC20m
2026-05-17 CPA413 ICN → HKG May 17, 23:15 UTCMay 18, 01:20 UTC2h 5m
2026-05-17 CPA430 HKG → ICN May 17, 10:05 UTCMay 17, 13:15 UTC3h 10m
2026-05-16 CPA961 HGH → HKG May 16, 10:05 UTCMay 16, 10:25 UTC20m
2026-05-16 CPA960 HKG → HGH May 16, 04:35 UTCMay 16, 04:50 UTC15m
2026-05-15 CPA991 FOC → HKG May 15, 16:35 UTCMay 15, 16:55 UTC20m
2026-05-15 CPA990 HKG → FOC May 15, 13:05 UTCMay 15, 13:20 UTC15m
2026-05-15 CPA495 TPE → HKG May 15, 10:50 UTCMay 15, 11:15 UTC25m
2026-05-15 CPA495 TPE → HKG May 15, 09:45 UTCMay 15, 10:15 UTC30m
2026-05-15 CPA494 HKG → TPE May 15, 07:15 UTCMay 15, 07:45 UTC30m
2026-05-15 CPA494 HKG → TPE May 15, 06:30 UTCMay 15, 06:45 UTC15m
2026-05-14 CPA419 ICN → HKG May 14, 11:10 UTCMay 14, 14:25 UTC3h 15m
2026-05-14 CPA418 HKG → ICN May 14, 06:45 UTCMay 14, 09:50 UTC3h 5m
2026-05-14 CPA906 MNL → HKG May 14, 04:40 UTCMay 14, 05:00 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-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 CPA364, CPA501, CPA347, CPA500, CPA419.