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 Jun 8, 12:50 UTC
Flights observed
246
Distinct callsigns
20
Country
CN
Last broadcast
Jun 8, 12:50 UTC

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 24 2026-06-03
CPA564 Cathay Pacific 20 2026-06-03
CPA450 Cathay Pacific 10 2026-05-28
CPA411 Cathay Pacific 10 2026-05-06
CPA798 Cathay Pacific 9 2026-06-04
CPA797 Cathay Pacific 9 2026-06-04
CPA718 Cathay Pacific 9 2026-05-18
CPA505 Cathay Pacific 9 2026-05-31
CPA719 Cathay Pacific 8 2026-05-17
CPA520 Cathay Pacific 7 2026-05-14
CPA974 Cathay Pacific 6 2026-05-30
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
CPA913 Cathay Pacific 5 2026-05-30
CPA543 Cathay Pacific 5 2026-06-08
CPA542 Cathay Pacific 5 2026-06-07
CPA973 Cathay Pacific 4 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-08 CPA459 KHH → HKG Jun 8, 12:10 UTCJun 8, 12:40 UTC30m
2026-06-08 CPA459 KHH → HKG Jun 8, 11:25 UTCJun 8, 11:35 UTC10m
2026-06-08 CPA458 HKG → KHH Jun 8, 09:50 UTCJun 8, 10:10 UTC20m
2026-06-08 CPA458 HKG → KHH Jun 8, 09:05 UTCJun 8, 09:20 UTC15m
2026-06-08 CPA543 HND → HKG Jun 8, 05:25 UTCJun 8, 05:40 UTC15m
2026-06-08 CPA543 HND → HKG Jun 8, 01:45 UTCJun 8, 04:45 UTC3h 0m
2026-06-07 CPA542 HKG → HND Jun 7, 09:35 UTCJun 7, 12:20 UTC2h 45m
2026-06-07 CPA542 HKG → HND Jun 7, 08:45 UTCJun 7, 09:00 UTC15m
2026-06-07 CPA973 XMN → HKG Jun 7, 05:25 UTCJun 7, 05:40 UTC15m
2026-06-07 CPA970 HKG → XMN Jun 7, 02:00 UTCJun 7, 02:10 UTC10m
2026-06-05 CPA973 XMN → HKG Jun 5, 06:45 UTCJun 5, 06:55 UTC10m
2026-06-05 CPA970 HKG → XMN Jun 5, 02:00 UTCJun 5, 02:10 UTC10m
2026-06-04 CPA798 CGK → HKG Jun 4, 21:55 UTCJun 4, 22:20 UTC25m
2026-06-04 CPA798 CGK → HKG Jun 4, 18:00 UTCJun 4, 19:20 UTC1h 20m
2026-06-04 CPA797 HKG → CGK Jun 4, 12:05 UTCJun 4, 12:15 UTC10m
2026-06-04 CPA930 MNL → HKG Jun 4, 06:25 UTCJun 4, 06:45 UTC20m
2026-06-04 CPA930 MNL → HKG Jun 4, 05:00 UTCJun 4, 05:25 UTC25m
2026-06-04 CPA901 HKG → MNL Jun 4, 01:20 UTCJun 4, 03:15 UTC1h 55m
2026-06-03 CPA565 TPE → HKG Jun 3, 12:30 UTCJun 3, 12:40 UTC10m
2026-06-03 CPA565 TPE → HKG Jun 3, 11:30 UTCJun 3, 11:55 UTC25m
2026-06-03 CPA565 TPE → HKG Jun 3, 09:45 UTCJun 3, 10:05 UTC20m
2026-06-03 CPA565 TPE → HKG Jun 3, 07:45 UTCJun 3, 08:15 UTC30m
2026-06-03 CPA564 HKG → TPE Jun 3, 03:45 UTCJun 3, 06:05 UTC2h 20m
2026-06-03 CPA564 HKG → TPE Jun 3, 00:35 UTCJun 3, 02:00 UTC1h 25m
2026-06-02 CPA742 RUH → HKG Jun 2, 13:20 UTCJun 2, 13:50 UTC30m
2026-06-02 CPA742 RUH → HKG Jun 2, 12:20 UTCJun 2, 12:35 UTC15m
2026-06-02 CPA743 HKG → BAH Jun 2, 10:05 UTCJun 2, 10:30 UTC25m
2026-06-02 CPA743 HKG → BAH Jun 2, 09:10 UTCJun 2, 09:25 UTC15m
2026-06-02 CPA930 MNL → HKG Jun 2, 06:20 UTCJun 2, 06:35 UTC15m
2026-06-02 CPA930 MNL → HKG Jun 2, 05:00 UTCJun 2, 05:25 UTC25m
2026-06-02 CPA901 HKG → MNL Jun 2, 01:40 UTCJun 2, 03:15 UTC1h 35m
2026-06-01 CPA565 TPE → HKG Jun 1, 13:00 UTCJun 1, 13:10 UTC10m
2026-06-01 CPA565 TPE → HKG Jun 1, 11:55 UTCJun 1, 12:20 UTC25m
2026-06-01 CPA565 TPE → HKG Jun 1, 09:55 UTCJun 1, 10:15 UTC20m
2026-06-01 CPA565 TPE → HKG Jun 1, 07:55 UTCJun 1, 08:30 UTC35m
2026-06-01 CPA564 HKG → TPE Jun 1, 04:55 UTCJun 1, 05:45 UTC50m
2026-06-01 CPA564 HKG → TPE Jun 1, 03:30 UTCJun 1, 03:45 UTC15m
2026-06-01 CPA564 HKG → TPE Jun 1, 01:25 UTCJun 1, 01:50 UTC25m
2026-06-01 CPA564 HKG → TPE Jun 1, 00:35 UTCJun 1, 00:50 UTC15m
2026-05-31 CPA505 NRT → HKG May 31, 10:10 UTCMay 31, 14:10 UTC4h 0m
2026-05-30 CPA974 MNL → HKG May 30, 23:45 UTCMay 31, 00:10 UTC25m
2026-05-30 CPA974 MNL → HKG May 30, 22:30 UTCMay 30, 23:00 UTC30m
2026-05-30 CPA913 HKG → MNL May 30, 13:05 UTCMay 30, 15:05 UTC2h 0m
2026-05-30 CPA543 HND → HKG May 30, 01:55 UTCMay 30, 05:45 UTC3h 50m
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

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 Jun 8, 12:50 UTC.
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, CPA798.