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sensors Mode-S transponder

7801A3

ICAO 24-bit transponder address · allocated to China

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

Hex
7801A3
Octal
36000643
Decimal
7,864,739
Country
CN
Tail
B-HYI
Type
A333
Broadcasting now · callsign CPA597 · 40,000 ft
Flights observed
314
Distinct callsigns
20
Country
CN
Last broadcast
1h ago

Current position

7801A3 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 7801A3 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
CPA347 - 15 2026-06-25
CPA654 - 14 2026-07-09
CPA653 - 12 2026-07-09
CPA312 - 12 2026-06-24
CPA776 - 10 2026-06-18
CPA597 - 10 2026-07-14
CPA495 - 10 2026-07-08
CPA413 - 10 2026-07-08
CPA430 - 9 2026-07-08
CPA777 - 8 2026-06-18
CPA494 - 8 2026-07-08
CPA965 - 6 2026-06-28
CPA652 - 6 2026-06-16
CPA566 - 6 2026-07-13
CPA501 Cathay Pacific 6 2026-06-21
CPA407 Cathay Pacific 6 2026-05-22
CPA377 - 6 2026-07-11
CPA964 - 5 2026-06-27
CPA780 Cathay Pacific 5 2026-05-23
CPA701 Cathay Pacific 5 2026-04-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CPA597 - Jul 14, 00:20 UTCJul 14, 00:45 UTC25m
2026-07-13 CPA566 HKG → KIX Jul 13, 19:35 UTCJul 13, 22:55 UTC3h 20m
2026-07-13 CPA989 - Jul 13, 15:15 UTCJul 13, 15:40 UTC25m
2026-07-13 CPA988 - Jul 13, 12:20 UTCJul 13, 12:45 UTC25m
2026-07-13 CPA634 - Jul 13, 08:55 UTCJul 13, 09:10 UTC15m
2026-07-13 CPA633 - Jul 13, 03:40 UTCJul 13, 03:50 UTC10m
2026-07-13 CPA633 - Jul 13, 00:50 UTCJul 13, 01:05 UTC15m
2026-07-12 CPA469 TPE → HKG Jul 12, 14:45 UTCJul 12, 16:05 UTC1h 20m
2026-07-12 CPA464 HKG → TPE Jul 12, 12:05 UTCJul 12, 13:25 UTC1h 20m
2026-07-12 CPA951 - Jul 12, 03:25 UTCJul 12, 09:40 UTC6h 15m
2026-07-12 CPA954 - Jul 12, 02:25 UTCJul 12, 02:40 UTC15m
2026-07-11 CPA377 - Jul 11, 09:35 UTCJul 11, 09:50 UTC15m
2026-07-11 CPA376 - Jul 11, 03:05 UTCJul 11, 09:00 UTC5h 55m
2026-07-10 CPA979 - Jul 10, 13:15 UTCJul 10, 14:00 UTC45m
2026-07-10 CPA978 - Jul 10, 10:30 UTCJul 10, 10:45 UTC15m
2026-07-10 CPA770 - Jul 10, 08:30 UTCJul 10, 08:55 UTC25m
2026-07-10 CPA771 - Jul 10, 02:40 UTCJul 10, 06:40 UTC4h 0m
2026-07-10 CPA771 - Jul 10, 00:55 UTCJul 10, 01:10 UTC15m
2026-07-09 CPA989 - Jul 9, 15:05 UTCJul 9, 15:25 UTC20m
2026-07-09 CPA988 - Jul 9, 12:30 UTCJul 9, 12:45 UTC15m
2026-07-09 CPA654 - Jul 9, 10:35 UTCJul 9, 10:55 UTC20m
2026-07-09 CPA654 - Jul 9, 08:25 UTCJul 9, 08:55 UTC30m
2026-07-09 CPA653 - Jul 9, 06:00 UTCJul 9, 06:40 UTC40m
2026-07-09 CPA653 - Jul 9, 04:20 UTCJul 9, 04:35 UTC15m
2026-07-08 CPA413 ICN → HKG Jul 8, 23:35 UTCJul 9, 02:35 UTC3h 0m
2026-07-08 CPA430 HKG → ICN Jul 8, 10:15 UTCJul 8, 13:20 UTC3h 5m
2026-07-08 CPA495 TPE → HKG Jul 8, 05:25 UTCJul 8, 07:00 UTC1h 35m
2026-07-08 CPA494 HKG → TPE Jul 8, 02:30 UTCJul 8, 03:55 UTC1h 25m
2026-07-07 CPA926 - Jul 7, 14:00 UTCJul 7, 14:20 UTC20m
2026-07-07 CPA925 - Jul 7, 07:35 UTCJul 7, 13:05 UTC5h 30m
2026-07-07 CPA597 KIX → HKG Jul 7, 00:15 UTCJul 7, 03:35 UTC3h 20m
2026-07-06 CPA566 HKG → KIX Jul 6, 18:00 UTCJul 6, 21:25 UTC3h 25m
2026-07-06 CPA331 - Jul 6, 11:25 UTCJul 6, 12:10 UTC45m
2026-07-06 CPA332 - Jul 6, 04:15 UTCJul 6, 04:30 UTC15m
2026-07-05 CPA413 ICN → HKG Jul 5, 23:30 UTCJul 6, 02:30 UTC3h 0m
2026-07-05 CPA430 HKG → ICN Jul 5, 10:55 UTCJul 5, 14:05 UTC3h 10m
2026-07-05 CPA377 - Jul 5, 08:45 UTCJul 5, 09:05 UTC20m
2026-07-05 CPA377 - Jul 5, 07:45 UTCJul 5, 07:55 UTC10m
2026-07-05 CPA376 - Jul 5, 02:45 UTCJul 5, 03:00 UTC15m
2026-07-04 CPA654 - Jul 4, 10:55 UTCJul 4, 11:05 UTC10m
2026-07-04 CPA654 - Jul 4, 08:45 UTCJul 4, 10:05 UTC1h 20m
2026-07-04 CPA653 HKG → BKK Jul 4, 04:15 UTCJul 4, 07:00 UTC2h 45m
2026-07-04 CPA413 ICN → HKG Jul 4, 02:05 UTCJul 4, 02:25 UTC20m
2026-07-03 CPA413 ICN → HKG Jul 3, 23:20 UTCJul 4, 01:30 UTC2h 10m
2026-07-03 CPA430 - Jul 3, 10:40 UTCJul 3, 13:55 UTC3h 15m
2026-07-03 CPA597 - Jul 3, 03:35 UTCJul 3, 03:55 UTC20m
2026-07-03 CPA597 - Jul 3, 00:25 UTCJul 3, 02:55 UTC2h 30m
2026-07-02 CPA566 HKG → KIX Jul 2, 18:05 UTCJul 2, 21:20 UTC3h 15m
2026-07-02 CPA991 - Jul 2, 14:35 UTCJul 2, 15:00 UTC25m
2026-07-02 CPA990 - Jul 2, 10:40 UTCJul 2, 10:55 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-HYI page for operator, model, and routing details .

Mode-S 7801A3 frequently asked

What is Mode-S code 7801A3?
7801A3 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HYI.
Where is Mode-S 7801A3 registered?
Mode-S code 7801A3 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7801A3 broadcasting right now?
Yes. Mode-S 7801A3 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7801A3, octal 36000643, decimal 7,864,739.
What flights does 7801A3 operate?
Mode-S 7801A3 has broadcast 20 distinct callsigns, including CPA347, CPA654, CPA653, CPA312, CPA776.