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sensors Mode-S transponder

7801B6

ICAO 24-bit transponder address · allocated to China

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

Hex
7801B6
Octal
36000666
Decimal
7,864,758
Country
CN
Tail
B-HLW
Type
A333
Transponder active on ground
Flights observed
353
Distinct callsigns
20
Country
CN
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 7801B6.

Country allocation

The ICAO 24-bit address 7801B6 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
CPA673 Cathay Pacific 12 2026-06-22
CPA658 - 10 2026-07-08
CPA419 - 10 2026-07-12
CPA418 - 9 2026-07-12
CPA777 - 8 2026-07-13
CPA750 - 8 2026-07-17
CPA725 - 8 2026-07-09
CPA724 - 8 2026-07-09
CPA722 - 8 2026-07-05
CPA711 - 8 2026-07-07
CPA672 - 8 2026-06-23
CPA509 - 8 2026-06-26
CPA776 - 7 2026-07-13
CPA758 Cathay Pacific 7 2026-05-20
CPA723 - 7 2026-07-05
CPA413 - 7 2026-07-17
CPA714 Cathay Pacific 6 2026-05-01
CPA710 - 6 2026-07-09
CPA705 - 6 2026-07-17
CPA364 - 6 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 CPA413 - Jul 17, 23:35 UTCJul 18, 01:30 UTC1h 55m
2026-07-17 CPA430 HKG → ICN Jul 17, 11:20 UTCJul 17, 14:30 UTC3h 10m
2026-07-17 CPA750 - Jul 17, 07:55 UTCJul 17, 08:15 UTC20m
2026-07-17 CPA750 - Jul 17, 05:45 UTCJul 17, 06:05 UTC20m
2026-07-17 CPA705 - Jul 17, 03:39 UTCJul 17, 03:50 UTC10m
2026-07-17 CPA705 - Jul 17, 01:35 UTCJul 17, 01:49 UTC15m
2026-07-16 CPA473 TPE → HKG Jul 16, 12:30 UTCJul 16, 13:49 UTC1h 20m
2026-07-16 CPA472 - Jul 16, 09:35 UTCJul 16, 11:05 UTC1h 30m
2026-07-16 CPA750 - Jul 16, 07:00 UTCJul 16, 07:15 UTC15m
2026-07-16 CPA750 - Jul 16, 04:30 UTCJul 16, 04:50 UTC20m
2026-07-16 CPA705 - Jul 16, 02:35 UTCJul 16, 03:00 UTC25m
2026-07-16 CPA705 - Jul 16, 00:30 UTCJul 16, 00:45 UTC15m
2026-07-15 CPA360 HKG → HKG Jul 15, 07:05 UTCJul 15, 13:20 UTC6h 15m
2026-07-14 CPA364 - Jul 14, 10:10 UTCJul 15, 04:20 UTC18h 9m
2026-07-14 CPA342 - Jul 14, 02:25 UTCJul 14, 08:20 UTC5h 55m
2026-07-13 CPA662 - Jul 13, 23:40 UTCJul 14, 00:00 UTC20m
2026-07-13 CPA662 - Jul 13, 20:40 UTCJul 13, 21:55 UTC1h 15m
2026-07-13 CPA667 - Jul 13, 17:05 UTCJul 13, 18:40 UTC1h 35m
2026-07-13 CPA667 - Jul 13, 15:15 UTCJul 13, 15:30 UTC15m
2026-07-13 CPA776 - Jul 13, 07:45 UTCJul 13, 09:20 UTC1h 35m
2026-07-13 CPA777 - Jul 13, 05:35 UTCJul 13, 05:50 UTC15m
2026-07-13 CPA777 - Jul 13, 01:40 UTCJul 13, 01:50 UTC10m
2026-07-12 CPA419 - Jul 12, 11:25 UTCJul 12, 14:25 UTC3h 0m
2026-07-12 CPA418 HKG → ICN Jul 12, 06:50 UTCJul 12, 10:01 UTC3h 10m
2026-07-12 CPA624 - Jul 12, 01:15 UTCJul 12, 01:35 UTC20m
2026-07-11 CPA624 - Jul 11, 23:05 UTCJul 11, 23:25 UTC20m
2026-07-11 CPA624 - Jul 11, 20:00 UTCJul 11, 20:20 UTC20m
2026-07-11 CPA623 - Jul 11, 15:10 UTCJul 11, 16:25 UTC1h 15m
2026-07-11 CPA623 - Jul 11, 13:05 UTCJul 11, 13:20 UTC15m
2026-07-11 CPA335 - Jul 11, 04:35 UTCJul 11, 07:35 UTC3h 0m
2026-07-10 CPA334 - Jul 10, 23:40 UTCJul 10, 23:55 UTC15m
2026-07-09 CPA724 - Jul 9, 13:25 UTCJul 9, 13:40 UTC15m
2026-07-09 CPA724 - Jul 9, 10:05 UTCJul 9, 10:30 UTC25m
2026-07-09 CPA725 - Jul 9, 08:05 UTCJul 9, 08:35 UTC30m
2026-07-09 CPA725 - Jul 9, 05:20 UTCJul 9, 05:35 UTC15m
2026-07-09 CPA710 - Jul 9, 02:45 UTCJul 9, 03:00 UTC15m
2026-07-08 CPA710 - Jul 8, 23:30 UTCJul 8, 23:55 UTC25m
2026-07-08 CPA659 - Jul 8, 21:10 UTCJul 8, 21:20 UTC10m
2026-07-08 CPA659 - Jul 8, 18:10 UTCJul 8, 18:25 UTC15m
2026-07-08 CPA636 - Jul 8, 16:05 UTCJul 8, 16:20 UTC15m
2026-07-08 CPA636 - Jul 8, 12:45 UTCJul 8, 13:15 UTC30m
2026-07-08 CPA635 - Jul 8, 10:25 UTCJul 8, 10:45 UTC20m
2026-07-08 CPA635 - Jul 8, 07:25 UTCJul 8, 07:40 UTC15m
2026-07-08 CPA658 - Jul 8, 05:20 UTCJul 8, 05:40 UTC20m
2026-07-08 CPA658 - Jul 8, 02:15 UTCJul 8, 02:40 UTC25m
2026-07-07 CPA711 - Jul 7, 12:20 UTCJul 7, 12:40 UTC20m
2026-07-07 CPA711 - Jul 7, 09:25 UTCJul 7, 09:45 UTC20m
2026-07-07 CPA347 - Jul 7, 05:00 UTCJul 7, 05:30 UTC30m
2026-07-07 CPA347 - Jul 7, 02:25 UTCJul 7, 02:40 UTC15m
2026-07-06 CPA312 - Jul 6, 09:15 UTCJul 6, 09:30 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-HLW page for operator, model, and routing details .

Mode-S 7801B6 frequently asked

What is Mode-S code 7801B6?
7801B6 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HLW.
Where is Mode-S 7801B6 registered?
Mode-S code 7801B6 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7801B6 broadcasting right now?
Mode-S 7801B6 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 7801B6, octal 36000666, decimal 7,864,758.
What flights does 7801B6 operate?
Mode-S 7801B6 has broadcast 20 distinct callsigns, including CPA673, CPA658, CPA419, CPA418, CPA777.