Apparatus

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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 7d ago
Flights observed
179
Distinct callsigns
20
Country
CN
Last broadcast
7d 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
CPA758 Cathay Pacific 7 2026-05-20
CPA714 Cathay Pacific 6 2026-05-01
CPA673 Cathay Pacific 6 2026-05-09
CPA658 Cathay Pacific 6 2026-05-14
CPA509 Cathay Pacific 6 2026-05-26
CPA759 Cathay Pacific 5 2026-05-20
CPA672 Cathay Pacific 5 2026-05-10
CPA419 Cathay Pacific 5 2026-05-26
CPA418 Cathay Pacific 5 2026-05-26
CPA777 Cathay Pacific 4 2026-05-15
CPA776 Cathay Pacific 4 2026-05-15
CPA722 Cathay Pacific 4 2026-05-02
CPA715 Cathay Pacific 4 2026-05-01
CPA711 Cathay Pacific 4 2026-05-13
CPA421 Cathay Pacific 4 2026-05-11
CPA364 Cathay Pacific 4 2026-05-07
CPA723 Cathay Pacific 3 2026-05-02
CPA524 Cathay Pacific 3 2026-05-25
CPA341 Cathay Pacific 3 2026-05-01
CPA979 Cathay Pacific 2 2026-04-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-26 CPA419 ICN → HKG May 26, 11:34 UTCMay 26, 14:30 UTC2h 55m
2026-05-26 CPA418 HKG → ICN May 26, 06:49 UTCMay 26, 10:10 UTC3h 20m
2026-05-26 CPA509 NRT → HKG May 26, 04:24 UTCMay 26, 04:39 UTC15m
2026-05-26 CPA509 NRT → HKG May 26, 00:49 UTCMay 26, 03:50 UTC3h 0m
2026-05-25 CPA524 HKG → NRT May 25, 18:10 UTCMay 25, 22:10 UTC3h 59m
2026-05-25 CPA724 KUL → HKG May 25, 13:30 UTCMay 25, 13:50 UTC20m
2026-05-25 CPA724 KUL → HKG May 25, 10:20 UTCMay 25, 10:50 UTC30m
2026-05-25 CPA725 HKG → KUL May 25, 08:00 UTCMay 25, 08:45 UTC45m
2026-05-25 CPA725 HKG → KUL May 25, 05:10 UTCMay 25, 05:25 UTC15m
2026-05-24 CPA449 KHH → HKG May 24, 23:45 UTCMay 24, 23:46 UTC1m
2026-05-24 CPA448 HKG → KHH May 24, 14:00 UTCMay 24, 15:00 UTC1h 0m
2026-05-24 CPA443 TPE → HKG May 24, 09:20 UTCMay 24, 09:35 UTC15m
2026-05-24 CPA443 TPE → HKG May 24, 08:15 UTCMay 24, 08:45 UTC30m
2026-05-24 CPA400 HKG → TPE May 24, 05:30 UTCMay 24, 06:50 UTC1h 20m
2026-05-24 CPA413 ICN → HKG May 24, 02:15 UTCMay 24, 02:25 UTC10m
2026-05-23 CPA413 ICN → HKG May 23, 23:25 UTCMay 24, 01:35 UTC2h 10m
2026-05-23 CPA430 HKG → ICN May 23, 10:55 UTCMay 23, 14:10 UTC3h 15m
2026-05-22 CPA419 ICN → HKG May 22, 16:25 UTCMay 22, 16:35 UTC10m
2026-05-22 CPA419 ICN → HKG May 22, 13:35 UTCMay 22, 15:50 UTC2h 15m
2026-05-22 CPA418 HKG → ICN May 22, 09:35 UTCMay 22, 11:55 UTC2h 20m
2026-05-22 CPA418 HKG → ICN May 22, 08:50 UTCMay 22, 09:05 UTC15m
2026-05-22 CPA509 NRT → HKG May 22, 05:00 UTCMay 22, 05:20 UTC20m
2026-05-22 CPA509 NRT → HKG May 22, 01:05 UTCMay 22, 04:20 UTC3h 15m
2026-05-21 CPA524 HKG → NRT May 21, 17:45 UTCMay 21, 21:45 UTC4h 0m
2026-05-20 CPA758 SIN → HKG May 20, 09:45 UTCMay 20, 09:55 UTC10m
2026-05-20 CPA758 SIN → HKG May 20, 06:25 UTCMay 20, 06:55 UTC30m
2026-05-20 CPA759 HKG → SIN May 20, 04:20 UTCMay 20, 04:45 UTC26m
2026-05-20 CPA759 HKG → SIN May 20, 01:25 UTCMay 20, 01:40 UTC15m
2026-05-19 CPA349 SHA → HKG May 19, 07:25 UTCMay 19, 07:40 UTC15m
2026-05-19 CPA342 HKG → SHA May 19, 02:15 UTCMay 19, 02:30 UTC15m
2026-05-18 CPA991 FOC → HKG May 18, 15:25 UTCMay 18, 15:40 UTC15m
2026-05-18 CPA990 HKG → FOC May 18, 11:45 UTCMay 18, 12:00 UTC15m
2026-05-18 CPA335 PEK → HKG May 18, 04:30 UTCMay 18, 07:25 UTC2h 55m
2026-05-17 CPA334 HKG → PEK May 17, 23:50 UTCMay 18, 00:05 UTC15m
2026-05-17 CPA327 SHA → HKG May 17, 16:10 UTCMay 17, 16:35 UTC25m
2026-05-17 CPA328 HKG → SHA May 17, 10:45 UTCMay 17, 11:55 UTC1h 10m
2026-05-17 CPA634 PEN → HKG May 17, 08:35 UTCMay 17, 09:00 UTC25m
2026-05-17 CPA633 HKG → PEN May 17, 00:40 UTCMay 17, 00:55 UTC15m
2026-05-16 CPA419 ICN → HKG May 16, 14:41 UTCMay 16, 15:01 UTC20m
2026-05-16 CPA419 ICN → HKG May 16, 11:51 UTCMay 16, 14:05 UTC2h 15m
2026-05-16 CPA418 HKG → ICN May 16, 08:05 UTCMay 16, 10:31 UTC2h 25m
2026-05-16 CPA418 HKG → ICN May 16, 07:16 UTCMay 16, 07:31 UTC15m
2026-05-16 CPA509 NRT → HKG May 16, 04:35 UTCMay 16, 04:55 UTC20m
2026-05-16 CPA509 NRT → HKG May 16, 00:55 UTCMay 16, 03:55 UTC3h 0m
2026-05-15 CPA524 HKG → NRT May 15, 18:05 UTCMay 15, 21:55 UTC3h 50m
2026-05-15 CPA776 CGK → HKG May 15, 13:00 UTCMay 15, 13:10 UTC10m
2026-05-15 CPA776 CGK → HKG May 15, 10:35 UTCMay 15, 11:00 UTC25m
2026-05-15 CPA777 HKG → CGK May 15, 03:10 UTCMay 15, 03:30 UTC20m
2026-05-14 CPA658 SIN → HKG May 14, 05:20 UTCMay 14, 05:40 UTC20m
2026-05-14 CPA658 SIN → HKG May 14, 02:10 UTCMay 14, 02:30 UTC20m

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 7d ago.
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 CPA758, CPA714, CPA673, CPA658, CPA509.