Apparatus

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sensors Mode-S transponder

780172

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-HNJ · BOEING 777-300

Hex
780172
Octal
36000562
Decimal
7,864,690
Country
CN
Tail
B-HNJ
Type
B773
No current signal · last broadcast Jul 25, 13:20 UTC
Flights observed
411
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 13:20 UTC

Last known position

Most recent position reported by Mode-S 780172.

Country allocation

The ICAO 24-bit address 780172 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
CPA451 Cathay Pacific 28 2026-07-19
CPA565 - 21 2026-07-02
CPA521 - 20 2026-07-08
CPA520 - 20 2026-07-08
CPA564 - 19 2026-07-02
CPA798 - 17 2026-07-14
CPA719 Cathay Pacific 17 2026-07-25
CPA504 Cathay Pacific 15 2026-07-19
CPA507 - 13 2026-06-26
CPA506 - 12 2026-06-26
CPA718 - 11 2026-07-01
CPA918 - 10 2026-07-06
CPA303 - 10 2026-07-13
CPA919 - 9 2026-07-06
CPA411 - 9 2026-07-03
CPA302 - 9 2026-07-05
CPA797 - 8 2026-06-23
CPA450 Cathay Pacific 8 2026-07-18
CPA361 - 8 2026-07-04
CPA784 - 7 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CPA719 HKG → CGK Jul 25, 13:00 UTCJul 25, 13:20 UTC20m
2026-07-25 CPA719 HKG → CGK Jul 25, 09:10 UTCJul 25, 09:20 UTC10m
2026-07-25 CPA543 HND → HKG Jul 25, 01:50 UTCJul 25, 05:30 UTC3h 40m
2026-07-24 CPA542 HKG → HND Jul 24, 09:35 UTCJul 24, 13:20 UTC3h 45m
2026-07-24 CPA495 TPE → HKG Jul 24, 05:35 UTCJul 24, 07:20 UTC1h 45m
2026-07-24 CPA494 HKG → TPE Jul 24, 02:30 UTCJul 24, 03:40 UTC1h 10m
2026-07-23 CPA742 RUH → HKG Jul 23, 14:05 UTCJul 23, 14:25 UTC20m
2026-07-23 CPA742 RUH → HKG Jul 23, 13:10 UTCJul 23, 13:20 UTC10m
2026-07-23 CPA743 HKG → BAH Jul 23, 10:25 UTCJul 23, 10:35 UTC10m
2026-07-23 CPA743 HKG → BAH Jul 23, 09:10 UTCJul 23, 09:25 UTC15m
2026-07-23 CPA740 HAN → HKG Jul 23, 05:15 UTCJul 23, 05:50 UTC35m
2026-07-23 CPA741 HKG → HAN Jul 23, 01:00 UTCJul 23, 01:15 UTC15m
2026-07-22 CPA784 - Jul 22, 12:35 UTCJul 22, 12:50 UTC15m
2026-07-22 CPA785 HKG → DPS Jul 22, 02:25 UTCJul 22, 10:25 UTC8h 0m
2026-07-21 CPA381 - Jul 21, 07:15 UTCJul 21, 13:25 UTC6h 10m
2026-07-21 CPA543 HND → HKG Jul 21, 01:55 UTCJul 21, 05:35 UTC3h 40m
2026-07-20 CPA542 HKG → HND Jul 20, 09:35 UTCJul 20, 13:25 UTC3h 50m
2026-07-20 CPA740 HAN → HKG Jul 20, 06:20 UTCJul 20, 06:55 UTC35m
2026-07-20 CPA740 HAN → HKG Jul 20, 05:20 UTCJul 20, 05:30 UTC10m
2026-07-20 CPA741 HKG → HAN Jul 20, 02:10 UTCJul 20, 02:25 UTC15m
2026-07-19 CPA451 TPE → HKG Jul 19, 12:35 UTCJul 19, 13:50 UTC1h 15m
2026-07-19 CPA451 TPE → HKG Jul 19, 10:05 UTCJul 19, 10:35 UTC30m
2026-07-19 CPA451 TPE → HKG Jul 19, 07:40 UTCJul 19, 08:55 UTC1h 15m
2026-07-19 CPA504 HKG → NRT Jul 19, 02:00 UTCJul 19, 05:55 UTC3h 55m
2026-07-18 CPA505 - Jul 18, 11:20 UTCJul 18, 14:50 UTC3h 30m
2026-07-18 CPA450 HKG → TPE Jul 18, 08:00 UTCJul 18, 09:30 UTC1h 30m
2026-07-18 CPA450 HKG → TPE Jul 18, 06:30 UTCJul 18, 06:40 UTC10m
2026-07-18 CPA450 HKG → TPE Jul 18, 03:10 UTCJul 18, 04:40 UTC1h 30m
2026-07-17 CPA369D - Jul 17, 08:35 UTCJul 17, 08:45 UTC10m
2026-07-17 CPA369D - Jul 17, 07:20 UTCJul 17, 07:55 UTC35m
2026-07-15 CPA362 - Jul 15, 12:40 UTCJul 15, 13:50 UTC1h 10m
2026-07-14 CPA798 - Jul 14, 21:40 UTCJul 14, 21:55 UTC15m
2026-07-14 CPA798 - Jul 14, 17:35 UTCJul 14, 18:55 UTC1h 20m
2026-07-14 CPA719 - Jul 14, 12:05 UTCJul 14, 12:15 UTC10m
2026-07-14 CPA719 - Jul 14, 08:15 UTCJul 14, 08:25 UTC10m
2026-07-13 CPA303 - Jul 13, 14:20 UTCJul 14, 01:35 UTC11h 15m
2026-07-13 CPA369 HKG → HKG Jul 13, 06:15 UTCJul 13, 12:25 UTC6h 10m
2026-07-08 CPA521 NRT → HKG Jul 8, 08:45 UTCJul 8, 12:30 UTC3h 45m
2026-07-08 CPA520 HKG → NRT Jul 8, 03:10 UTCJul 8, 07:05 UTC3h 55m
2026-07-07 CPA521 - Jul 7, 09:45 UTCJul 7, 13:35 UTC3h 50m
2026-07-07 CPA520 HKG → NRT Jul 7, 04:10 UTCJul 7, 08:05 UTC3h 55m
2026-07-06 CPA303 - Jul 6, 13:55 UTCJul 7, 01:40 UTC11h 45m
2026-07-06 CPA918 - Jul 6, 11:40 UTCJul 6, 11:55 UTC15m
2026-07-06 CPA918 - Jul 6, 10:15 UTCJul 6, 11:05 UTC50m
2026-07-06 CPA919 HKG → MNL Jul 6, 06:20 UTCJul 6, 08:00 UTC1h 40m
2026-07-05 CPA303 - Jul 5, 14:35 UTCJul 6, 02:05 UTC11h 30m
2026-07-05 CPA302 - Jul 5, 13:30 UTCJul 5, 13:45 UTC15m
2026-07-05 CPA918 MNL → HKG Jul 5, 09:55 UTCJul 5, 11:40 UTC1h 45m
2026-07-05 CPA919 HKG → MNL Jul 5, 06:25 UTCJul 5, 08:20 UTC1h 55m
2026-07-05 CPA303 - Jul 5, 01:35 UTCJul 5, 01:45 UTC10m

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

Mode-S 780172 frequently asked

What is Mode-S code 780172?
780172 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HNJ.
Where is Mode-S 780172 registered?
Mode-S code 780172 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780172 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 13:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780172, octal 36000562, decimal 7,864,690.
What flights does 780172 operate?
Mode-S 780172 has broadcast 20 distinct callsigns, including CPA451, CPA565, CPA521, CPA520, CPA564.