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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
Broadcasting now · callsign CPA654 · 4,800 ft
Flights observed
359
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Current position

7801B9 is currently broadcasting. Map zoomed to live position.

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
CPA653 - 21 2026-07-14
CPA654 - 19 2026-07-14
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
CPA776 Cathay Pacific 7 2026-05-30
CPA723 - 7 2026-07-13
CPA502 Cathay Pacific 7 2026-06-12
CPA501 - 7 2026-07-12
CPA407 - 7 2026-07-02
CPA365 - 7 2026-07-04
CPA347 - 7 2026-06-30
CPA964 - 6 2026-07-13
CPA780 - 6 2026-06-14
CPA777 Cathay Pacific 6 2026-05-30
CPA725 - 6 2026-07-10
CPA724 - 6 2026-07-10
CPA722 - 6 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-14 CPA653 - Jul 14, 04:20 UTCJul 14, 04:30 UTC10m
2026-07-13 CPA964 - Jul 13, 12:40 UTCJul 14, 02:15 UTC13h 35m
2026-07-13 CPA722 - Jul 13, 08:50 UTCJul 13, 09:15 UTC25m
2026-07-13 CPA722 - Jul 13, 05:35 UTCJul 13, 06:10 UTC35m
2026-07-13 CPA723 - Jul 13, 03:10 UTCJul 13, 03:50 UTC40m
2026-07-13 CPA723 - Jul 13, 00:35 UTCJul 13, 00:45 UTC10m
2026-07-12 CPA501 NRT → HKG Jul 12, 13:35 UTCJul 12, 17:15 UTC3h 40m
2026-07-12 CPA500 HKG → NRT Jul 12, 07:50 UTCJul 12, 12:05 UTC4h 15m
2026-07-12 CPA658 - Jul 12, 05:05 UTCJul 12, 05:25 UTC20m
2026-07-12 CPA658 - Jul 12, 01:55 UTCJul 12, 02:20 UTC25m
2026-07-11 CPA711 - Jul 11, 12:05 UTCJul 11, 12:35 UTC30m
2026-07-11 CPA711 - Jul 11, 09:20 UTCJul 11, 09:35 UTC15m
2026-07-11 CPA750 - Jul 11, 06:50 UTCJul 11, 07:05 UTC15m
2026-07-11 CPA750 - Jul 11, 04:40 UTCJul 11, 05:01 UTC20m
2026-07-11 CPA705 - Jul 11, 02:35 UTCJul 11, 03:10 UTC35m
2026-07-11 CPA705 - Jul 11, 00:45 UTCJul 11, 01:00 UTC15m
2026-07-10 CPA724 - Jul 10, 13:15 UTCJul 10, 13:30 UTC15m
2026-07-10 CPA724 - Jul 10, 10:05 UTCJul 10, 10:35 UTC30m
2026-07-10 CPA725 - Jul 10, 07:35 UTCJul 10, 08:15 UTC40m
2026-07-10 CPA725 - Jul 10, 04:55 UTCJul 10, 05:15 UTC20m
2026-07-09 CPA413 - Jul 9, 23:10 UTCJul 10, 02:20 UTC3h 10m
2026-07-09 CPA430 HKG → ICN Jul 9, 10:10 UTCJul 9, 13:20 UTC3h 10m
2026-07-09 CPA770 - Jul 9, 08:30 UTCJul 9, 08:45 UTC15m
2026-07-09 CPA771 - Jul 9, 02:40 UTCJul 9, 06:45 UTC4h 5m
2026-07-09 CPA771 - Jul 9, 00:55 UTCJul 9, 01:10 UTC15m
2026-07-08 CPA501 NRT → HKG Jul 8, 13:40 UTCJul 8, 17:35 UTC3h 55m
2026-07-08 CPA500 HKG → NRT Jul 8, 08:20 UTCJul 8, 12:20 UTC4h 0m
2026-07-08 CPA700 - Jul 8, 03:00 UTCJul 8, 03:10 UTC10m
2026-07-08 CPA700 - Jul 8, 00:40 UTCJul 8, 01:10 UTC30m
2026-07-07 CPA617 HKG → BKK Jul 7, 14:45 UTCJul 7, 17:15 UTC2h 30m
2026-07-07 CPA951 HKG → HKG Jul 7, 04:15 UTCJul 7, 11:25 UTC7h 10m
2026-07-06 CPA449 KHH → HKG Jul 6, 23:35 UTCJul 7, 00:45 UTC1h 10m
2026-07-06 CPA448 HKG → KHH Jul 6, 14:20 UTCJul 6, 15:25 UTC1h 5m
2026-07-06 CPA634 - Jul 6, 08:35 UTCJul 6, 08:50 UTC15m
2026-07-06 CPA634 - Jul 6, 05:25 UTCJul 6, 05:35 UTC10m
2026-07-06 CPA633 - Jul 6, 03:50 UTCJul 6, 04:05 UTC15m
2026-07-06 CPA633 - Jul 6, 01:00 UTCJul 6, 01:15 UTC15m
2026-07-05 CPA979 - Jul 5, 13:35 UTCJul 5, 13:45 UTC10m
2026-07-05 CPA978 - Jul 5, 10:10 UTCJul 5, 10:25 UTC15m
2026-07-05 CPA770 - Jul 5, 08:05 UTCJul 5, 08:20 UTC15m
2026-07-05 CPA771 - Jul 5, 01:30 UTCJul 5, 07:30 UTC6h 0m
2026-07-05 CPA771 - Jul 5, 00:30 UTCJul 5, 00:45 UTC15m
2026-07-04 CPA337 PEK → HKG Jul 4, 12:30 UTCJul 4, 15:25 UTC2h 55m
2026-07-04 CPA336 - Jul 4, 10:35 UTCJul 4, 10:45 UTC10m
2026-07-04 CPA336 - Jul 4, 08:00 UTCJul 4, 08:20 UTC20m
2026-07-04 CPA365 - Jul 4, 04:25 UTCJul 4, 05:10 UTC45m
2026-07-03 CPA365 - Jul 3, 11:40 UTCJul 4, 03:40 UTC16h 0m
2026-07-03 CPA364 - Jul 3, 10:25 UTCJul 3, 10:40 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-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?
Yes. Mode-S 7801B9 is currently airborne.
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 CPA653, CPA654, CPA419, CPA418, CPA597.