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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
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
389
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 21:30 UTC

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
CPA658 Cathay Pacific 13 2026-07-25
CPA711 Cathay Pacific 12 2026-07-24
CPA673 Cathay Pacific 12 2026-06-22
CPA750 Cathay Pacific 10 2026-07-21
CPA419 - 10 2026-07-12
CPA758 Cathay Pacific 9 2026-07-23
CPA418 - 9 2026-07-12
CPA777 - 8 2026-07-13
CPA725 - 8 2026-07-09
CPA724 - 8 2026-07-09
CPA722 - 8 2026-07-05
CPA705 Cathay Pacific 8 2026-07-21
CPA672 - 8 2026-06-23
CPA509 - 8 2026-06-26
CPA776 - 7 2026-07-13
CPA759 Cathay Pacific 7 2026-07-23
CPA723 - 7 2026-07-05
CPA413 - 7 2026-07-17
CPA342 Cathay Pacific 7 2026-07-24
CPA714 Cathay Pacific 6 2026-05-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CPA524 HKG → NRT Jul 26, 17:35 UTCJul 26, 21:30 UTC3h 55m
2026-07-26 CPA569 KIX → HKG Jul 26, 14:50 UTCJul 26, 15:00 UTC10m
2026-07-26 CPA569 KIX → HKG Jul 26, 11:25 UTCJul 26, 14:10 UTC2h 45m
2026-07-25 CPA502 HKG → KIX Jul 25, 10:25 UTCJul 25, 13:40 UTC3h 15m
2026-07-25 CPA658 SIN → HKG Jul 25, 05:25 UTCJul 25, 05:40 UTC15m
2026-07-25 CPA658 SIN → HKG Jul 25, 02:05 UTCJul 25, 02:30 UTC25m
2026-07-24 CPA711 HKG → SIN Jul 24, 12:15 UTCJul 24, 12:40 UTC25m
2026-07-24 CPA711 HKG → SIN Jul 24, 09:25 UTCJul 24, 09:40 UTC15m
2026-07-24 CPA349 SHA → HKG Jul 24, 07:30 UTCJul 24, 07:45 UTC15m
2026-07-24 CPA342 HKG → SHA Jul 24, 01:55 UTCJul 24, 02:35 UTC40m
2026-07-23 CPA327 SHA → HKG Jul 23, 11:30 UTCJul 23, 17:05 UTC5h 35m
2026-07-23 CPA758 SIN → HKG Jul 23, 09:20 UTCJul 23, 09:35 UTC15m
2026-07-23 CPA758 SIN → HKG Jul 23, 06:05 UTCJul 23, 06:25 UTC20m
2026-07-23 CPA759 HKG → SIN Jul 23, 04:10 UTCJul 23, 04:20 UTC10m
2026-07-23 CPA759 HKG → SIN Jul 23, 01:10 UTCJul 23, 01:20 UTC10m
2026-07-22 CPA473 TPE → HKG Jul 22, 11:20 UTCJul 22, 12:45 UTC1h 25m
2026-07-22 CPA658 SIN → HKG Jul 22, 02:05 UTCJul 22, 02:25 UTC20m
2026-07-21 CPA711 HKG → SIN Jul 21, 12:30 UTCJul 21, 12:40 UTC10m
2026-07-21 CPA711 HKG → SIN Jul 21, 09:20 UTCJul 21, 09:40 UTC20m
2026-07-21 CPA750 BKK → HKG Jul 21, 06:30 UTCJul 21, 06:50 UTC20m
2026-07-21 CPA750 BKK → HKG Jul 21, 04:20 UTCJul 21, 04:50 UTC30m
2026-07-21 CPA705 HKG → BKK Jul 21, 02:10 UTCJul 21, 02:35 UTC25m
2026-07-21 CPA705 HKG → BKK Jul 21, 00:20 UTCJul 21, 00:35 UTC15m
2026-07-20 CPA377 PVG → HKG Jul 20, 02:55 UTCJul 20, 08:55 UTC6h 0m
2026-07-20 CPA612 CMB → HKG Jul 20, 00:30 UTCJul 20, 00:55 UTC25m
2026-07-19 CPA611 - Jul 19, 15:10 UTCJul 19, 22:35 UTC7h 25m
2026-07-19 CPA611 - Jul 19, 13:15 UTCJul 19, 13:30 UTC15m
2026-07-19 CPA539 NGO → HKG Jul 19, 08:05 UTCJul 19, 11:30 UTC3h 25m
2026-07-19 CPA536 HKG → NGO Jul 19, 03:00 UTCJul 19, 06:25 UTC3h 25m
2026-07-19 CPA612 CMB → HKG Jul 19, 00:25 UTCJul 19, 00:45 UTC20m
2026-07-18 CPA611 - Jul 18, 15:00 UTCJul 18, 22:25 UTC7h 25m
2026-07-18 CPA611 - Jul 18, 13:00 UTCJul 18, 13:15 UTC15m
2026-07-18 CPA654 - Jul 18, 10:40 UTCJul 18, 11:00 UTC20m
2026-07-18 CPA654 - Jul 18, 08:25 UTCJul 18, 08:40 UTC15m
2026-07-18 CPA653 - Jul 18, 06:30 UTCJul 18, 06:40 UTC10m
2026-07-18 CPA653 - Jul 18, 04:25 UTCJul 18, 04:40 UTC15m
2026-07-17 CPA413 ICN → HKG Jul 17, 23:35 UTCJul 18, 02:25 UTC2h 50m
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

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?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
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 CPA658, CPA711, CPA673, CPA750, CPA419.