Apparatus

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sensors Mode-S transponder

780173

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-HNK · BOEING 777-300

Hex
780173
Octal
36000563
Decimal
7,864,691
Country
CN
Tail
B-HNK
Type
B773
No current signal · last broadcast 13h ago
Flights observed
202
Distinct callsigns
20
Country
CN
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S 780173.

Country allocation

The ICAO 24-bit address 780173 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
CPA565 Cathay Pacific 16 2026-05-20
CPA564 Cathay Pacific 14 2026-05-20
CPA450 Cathay Pacific 10 2026-05-28
CPA411 Cathay Pacific 10 2026-05-06
CPA718 Cathay Pacific 9 2026-05-18
CPA797 Cathay Pacific 8 2026-05-15
CPA719 Cathay Pacific 8 2026-05-17
CPA505 Cathay Pacific 8 2026-05-28
CPA798 Cathay Pacific 7 2026-05-15
CPA520 Cathay Pacific 7 2026-05-14
CPA918 Cathay Pacific 6 2026-05-26
CPA521 Cathay Pacific 6 2026-05-14
CPA507 Cathay Pacific 6 2026-05-27
CPA410 Cathay Pacific 6 2026-05-06
CPA919 Cathay Pacific 5 2026-05-26
CPA974 Cathay Pacific 4 2026-05-13
CPA913 Cathay Pacific 4 2026-05-13
CPA506 Cathay Pacific 4 2026-05-27
CPA451 Cathay Pacific 4 2026-05-09
CPA431 Cathay Pacific 4 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CPA542 HKG → HND May 29, 08:55 UTCMay 29, 12:25 UTC3h 30m
2026-05-29 CPA431 KHH → HKG May 29, 04:45 UTCMay 29, 05:50 UTC1h 5m
2026-05-29 CPA432 HKG → KHH May 29, 00:55 UTCMay 29, 02:00 UTC1h 5m
2026-05-28 CPA505 NRT → HKG May 28, 13:40 UTCMay 28, 13:55 UTC15m
2026-05-28 CPA505 NRT → HKG May 28, 10:05 UTCMay 28, 13:05 UTC3h 0m
2026-05-28 CPA450 HKG → TPE May 28, 06:50 UTCMay 28, 08:10 UTC1h 20m
2026-05-28 CPA450 HKG → TPE May 28, 05:20 UTCMay 28, 05:35 UTC15m
2026-05-28 CPA450 HKG → TPE May 28, 02:15 UTCMay 28, 03:40 UTC1h 25m
2026-05-27 CPA507 KIX → HKG May 27, 11:50 UTCMay 27, 12:05 UTC15m
2026-05-27 CPA507 KIX → HKG May 27, 09:00 UTCMay 27, 11:15 UTC2h 15m
2026-05-27 CPA506 HKG → KIX May 27, 02:49 UTCMay 27, 05:59 UTC3h 10m
2026-05-26 CPA918 MNL → HKG May 26, 09:59 UTCMay 26, 11:39 UTC1h 40m
2026-05-26 CPA919 HKG → MNL May 26, 06:29 UTCMay 26, 08:15 UTC1h 45m
2026-05-24 CPA906 MNL → HKG May 24, 03:10 UTCMay 24, 04:45 UTC1h 35m
2026-05-23 CPA907 HKG → MNL May 23, 23:35 UTCMay 24, 01:20 UTC1h 45m
2026-05-23 CPA918 MNL → HKG May 23, 10:35 UTCMay 23, 12:20 UTC1h 45m
2026-05-23 CPA919 HKG → MNL May 23, 06:50 UTCMay 23, 08:25 UTC1h 35m
2026-05-23 CPA303 PVG → HKG May 23, 01:35 UTCMay 23, 01:45 UTC10m
2026-05-22 CPA303 PVG → HKG May 22, 15:05 UTCMay 23, 00:45 UTC9h 40m
2026-05-22 CPA302 HKG → PVG May 22, 14:15 UTCMay 22, 14:25 UTC10m
2026-05-22 CPA918 MNL → HKG May 22, 12:05 UTCMay 22, 12:25 UTC20m
2026-05-22 CPA918 MNL → HKG May 22, 10:30 UTCMay 22, 10:55 UTC25m
2026-05-22 CPA919 HKG → MNL May 22, 06:55 UTCMay 22, 08:35 UTC1h 40m
2026-05-22 CPA431 KHH → HKG May 22, 04:35 UTCMay 22, 04:45 UTC10m
2026-05-22 CPA431 KHH → HKG May 22, 03:45 UTCMay 22, 04:05 UTC20m
2026-05-22 CPA432 HKG → KHH May 22, 01:20 UTCMay 22, 02:25 UTC1h 5m
2026-05-21 CPA505 NRT → HKG May 21, 13:45 UTCMay 21, 14:00 UTC15m
2026-05-21 CPA505 NRT → HKG May 21, 09:55 UTCMay 21, 13:10 UTC3h 15m
2026-05-21 CPA450 HKG → TPE May 21, 05:15 UTCMay 21, 07:55 UTC2h 40m
2026-05-21 CPA450 HKG → TPE May 21, 02:25 UTCMay 21, 03:45 UTC1h 20m
2026-05-20 CPA565 TPE → HKG May 20, 12:30 UTCMay 20, 12:50 UTC20m
2026-05-20 CPA565 TPE → HKG May 20, 11:25 UTCMay 20, 11:50 UTC25m
2026-05-20 CPA565 TPE → HKG May 20, 09:35 UTCMay 20, 10:00 UTC25m
2026-05-20 CPA565 TPE → HKG May 20, 07:40 UTCMay 20, 08:10 UTC30m
2026-05-20 CPA564 HKG → TPE May 20, 03:30 UTCMay 20, 05:35 UTC2h 6m
2026-05-20 CPA564 HKG → TPE May 20, 00:35 UTCMay 20, 02:00 UTC1h 25m
2026-05-19 CPA505 NRT → HKG May 19, 14:00 UTCMay 19, 14:15 UTC15m
2026-05-19 CPA505 NRT → HKG May 19, 10:25 UTCMay 19, 13:20 UTC2h 55m
2026-05-19 CPA450 HKG → TPE May 19, 07:20 UTCMay 19, 08:35 UTC1h 15m
2026-05-19 CPA450 HKG → TPE May 19, 05:45 UTCMay 19, 06:00 UTC15m
2026-05-19 CPA450 HKG → TPE May 19, 02:55 UTCMay 19, 04:15 UTC1h 20m
2026-05-18 CPA902 MNL → HKG May 18, 13:05 UTCMay 18, 14:45 UTC1h 40m
2026-05-18 CPA903 HKG → MNL May 18, 10:05 UTCMay 18, 10:35 UTC30m
2026-05-18 CPA903 HKG → MNL May 18, 09:05 UTCMay 18, 09:15 UTC10m
2026-05-18 CPA718 CGK → HKG May 18, 02:55 UTCMay 18, 03:20 UTC25m
2026-05-18 CPA718 CGK → HKG May 18, 01:10 UTCMay 18, 01:20 UTC10m
2026-05-17 CPA719 HKG → CGK May 17, 08:15 UTCMay 17, 08:30 UTC15m
2026-05-17 CPA543 HND → HKG May 17, 05:15 UTCMay 17, 05:35 UTC20m
2026-05-17 CPA543 HND → HKG May 17, 01:50 UTCMay 17, 04:35 UTC2h 45m
2026-05-16 CPA542 HKG → HND May 16, 09:45 UTCMay 16, 12:50 UTC3h 5m

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-HNK page for operator, model, and routing details .

Mode-S 780173 frequently asked

What is Mode-S code 780173?
780173 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HNK.
Where is Mode-S 780173 registered?
Mode-S code 780173 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780173 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780173, octal 36000563, decimal 7,864,691.
What flights does 780173 operate?
Mode-S 780173 has broadcast 20 distinct callsigns, including CPA565, CPA564, CPA450, CPA411, CPA718.