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sensors Mode-S transponder

7801B9

ICAO 24-bit transponder address · allocated to China

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

Hex
7801B9
Octal
36000671
Decimal
7,864,761
Country
CN
Tail
B-HYQ
Type
A333
No current signal · last broadcast Jul 26, 12:50 UTC
Flights observed
407
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 12:50 UTC

Last known position

Most recent position reported by Mode-S 7801B9.

Country allocation

The ICAO 24-bit address 7801B9 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
CPA654 Cathay Pacific 24 2026-07-21
CPA653 Cathay Pacific 24 2026-07-21
CPA419 Cathay Pacific 14 2026-06-30
CPA418 - 12 2026-06-30
CPA597 - 11 2026-07-01
CPA503 - 10 2026-06-13
CPA629 - 9 2026-06-13
CPA501 Cathay Pacific 8 2026-07-23
CPA365 - 8 2026-07-17
CPA964 Cathay Pacific 7 2026-07-20
CPA776 Cathay Pacific 7 2026-05-30
CPA723 - 7 2026-07-13
CPA502 Cathay Pacific 7 2026-06-12
CPA500 Cathay Pacific 7 2026-07-23
CPA407 - 7 2026-07-02
CPA347 - 7 2026-06-30
CPA780 - 6 2026-06-14
CPA777 Cathay Pacific 6 2026-05-30
CPA725 - 6 2026-07-10
CPA724 - 6 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CPA369 PVG → HKG Jul 26, 12:20 UTCJul 26, 12:35 UTC15m
2026-07-26 CPA369 PVG → HKG Jul 26, 10:50 UTCJul 26, 11:45 UTC55m
2026-07-25 CPA369 PVG → HKG Jul 25, 12:20 UTCJul 26, 11:45 UTC23h 26m
2026-07-25 CPA364 HKG → PVG Jul 25, 11:25 UTCJul 25, 12:45 UTC1h 20m
2026-07-25 CPA461 TPE → HKG Jul 25, 05:20 UTCJul 25, 06:35 UTC1h 15m
2026-07-25 CPA466 HKG → TPE Jul 25, 02:15 UTCJul 25, 03:40 UTC1h 25m
2026-07-23 CPA501 NRT → HKG Jul 23, 13:30 UTCJul 23, 17:40 UTC4h 10m
2026-07-23 CPA500 HKG → NRT Jul 23, 07:45 UTCJul 23, 11:45 UTC4h 0m
2026-07-23 CPA700 BKK → HKG Jul 23, 03:00 UTCJul 23, 03:15 UTC15m
2026-07-23 CPA700 BKK → HKG Jul 23, 00:50 UTCJul 23, 01:20 UTC30m
2026-07-22 CPA617 - Jul 22, 16:35 UTCJul 22, 17:15 UTC40m
2026-07-22 CPA617 - Jul 22, 14:50 UTCJul 22, 15:05 UTC15m
2026-07-22 CPA946 HKG → XIY Jul 22, 03:50 UTCJul 22, 04:10 UTC20m
2026-07-22 CPA912 MNL → HKG Jul 22, 00:30 UTCJul 22, 02:05 UTC1h 35m
2026-07-21 CPA939 - Jul 21, 14:30 UTCJul 21, 16:10 UTC1h 40m
2026-07-21 CPA654 BKK → HKG Jul 21, 10:25 UTCJul 21, 10:30 UTC5m
2026-07-21 CPA654 BKK → HKG Jul 21, 08:15 UTCJul 21, 09:50 UTC1h 35m
2026-07-21 CPA653 HKG → BKK Jul 21, 04:20 UTCJul 21, 06:40 UTC2h 20m
2026-07-20 CPA964 HKG → HGH Jul 20, 12:45 UTCJul 21, 02:00 UTC13h 14m
2026-07-20 CPA930 MNL → HKG Jul 20, 08:10 UTCJul 20, 09:45 UTC1h 35m
2026-07-20 CPA901 HKG → MNL Jul 20, 04:20 UTCJul 20, 06:05 UTC1h 45m
2026-07-19 CPA974 - Jul 19, 23:10 UTCJul 19, 23:30 UTC20m
2026-07-19 CPA974 - Jul 19, 21:45 UTCJul 19, 22:15 UTC30m
2026-07-19 CPA913 HKG → MNL Jul 19, 13:00 UTCJul 19, 14:45 UTC1h 45m
2026-07-19 CPA443 TPE → HKG Jul 19, 08:15 UTCJul 19, 09:40 UTC1h 25m
2026-07-19 CPA400 HKG → TPE Jul 19, 05:30 UTCJul 19, 06:55 UTC1h 25m
2026-07-19 CPA622 - Jul 19, 02:30 UTCJul 19, 02:55 UTC25m
2026-07-18 CPA621 - Jul 18, 13:10 UTCJul 18, 13:25 UTC15m
2026-07-18 CPA621 - Jul 18, 10:15 UTCJul 18, 10:30 UTC15m
2026-07-18 CPA423 - Jul 18, 07:15 UTCJul 18, 08:20 UTC1h 5m
2026-07-18 CPA424 HKG → KHH Jul 18, 04:40 UTCJul 18, 05:50 UTC1h 10m
2026-07-17 CPA345 - Jul 17, 23:45 UTCJul 18, 02:50 UTC3h 6m
2026-07-17 CPA344 HKG → PEK Jul 17, 11:25 UTCJul 17, 11:50 UTC25m
2026-07-17 CPA365 - Jul 17, 05:20 UTCJul 17, 05:30 UTC10m
2026-07-16 CPA364 - Jul 16, 11:40 UTCJul 17, 04:49 UTC17h 10m
2026-07-16 CPA608 - Jul 16, 07:15 UTCJul 16, 07:35 UTC20m
2026-07-16 CPA607 - Jul 16, 01:35 UTCJul 16, 01:50 UTC15m
2026-07-15 CPA714 - Jul 15, 21:35 UTCJul 15, 22:00 UTC25m
2026-07-15 CPA714 - Jul 15, 18:15 UTCJul 15, 18:50 UTC35m
2026-07-15 CPA715 - Jul 15, 16:10 UTCJul 15, 16:40 UTC30m
2026-07-15 CPA715 - Jul 15, 13:30 UTCJul 15, 13:45 UTC15m
2026-07-15 CPA654 - Jul 15, 10:35 UTCJul 15, 10:55 UTC20m
2026-07-15 CPA654 - Jul 15, 08:25 UTCJul 15, 08:40 UTC15m
2026-07-15 CPA653 - Jul 15, 06:45 UTCJul 15, 06:55 UTC10m
2026-07-15 CPA653 - Jul 15, 04:35 UTCJul 15, 04:45 UTC10m
2026-07-14 CPA989 - Jul 14, 15:10 UTCJul 14, 15:50 UTC40m
2026-07-14 CPA988 - Jul 14, 12:50 UTCJul 14, 13:05 UTC15m
2026-07-14 CPA654 - Jul 14, 10:30 UTCJul 14, 10:55 UTC25m
2026-07-14 CPA654 - Jul 14, 08:25 UTCJul 14, 08:40 UTC15m
2026-07-14 CPA653 - Jul 14, 06:20 UTCJul 14, 06:55 UTC35m

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

Mode-S 7801B9 frequently asked

What is Mode-S code 7801B9?
7801B9 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HYQ.
Where is Mode-S 7801B9 registered?
Mode-S code 7801B9 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7801B9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7801B9, octal 36000671, decimal 7,864,761.
What flights does 7801B9 operate?
Mode-S 7801B9 has broadcast 20 distinct callsigns, including CPA654, CPA653, CPA419, CPA418, CPA597.