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sensors Mode-S transponder

780171

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-HNI · BOEING 777-300

Hex
780171
Octal
36000561
Decimal
7,864,689
Country
CN
Tail
B-HNI
Type
B773
Broadcasting now · callsign CPA520 · 31,000 ft
Flights observed
456
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 12:05 UTC

Current position

780171 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 780171 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 29 2026-07-19
CPA450 Cathay Pacific 27 2026-07-23
CPA564 Cathay Pacific 23 2026-07-19
CPA505 - 20 2026-07-23
CPA521 Cathay Pacific 17 2026-07-24
CPA930 - 16 2026-07-09
CPA901 - 15 2026-07-09
CPA918 - 14 2026-07-17
CPA798 - 14 2026-07-18
CPA451 - 14 2026-07-03
CPA520 Cathay Pacific 13 2026-07-24
CPA507 - 10 2026-07-16
CPA431 - 10 2026-07-17
CPA411 - 10 2026-06-19
CPA797 - 9 2026-07-18
CPA718 Cathay Pacific 9 2026-06-01
CPA974 - 8 2026-07-17
CPA919 - 8 2026-07-17
CPA913 - 8 2026-07-17
CPA719 Cathay Pacific 8 2026-05-31

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CPA549 HND → HKG Jul 26, 08:05 UTCJul 26, 11:50 UTC3h 45m
2026-07-25 CPA542 HKG → HND Jul 25, 10:10 UTCJul 25, 13:40 UTC3h 30m
2026-07-25 CPA740 HAN → HKG Jul 25, 05:40 UTCJul 25, 06:10 UTC30m
2026-07-25 CPA740 HAN → HKG Jul 25, 04:45 UTCJul 25, 04:55 UTC10m
2026-07-25 CPA741 HKG → HAN Jul 25, 01:10 UTCJul 25, 01:20 UTC10m
2026-07-24 CPA521 NRT → HKG Jul 24, 09:10 UTCJul 24, 12:55 UTC3h 45m
2026-07-24 CPA520 HKG → NRT Jul 24, 03:35 UTCJul 24, 07:25 UTC3h 50m
2026-07-23 CPA505 NRT → HKG Jul 23, 10:05 UTCJul 23, 13:50 UTC3h 45m
2026-07-23 CPA450 HKG → TPE Jul 23, 06:45 UTCJul 23, 08:10 UTC1h 25m
2026-07-23 CPA450 HKG → TPE Jul 23, 05:15 UTCJul 23, 05:25 UTC10m
2026-07-23 CPA450 HKG → TPE Jul 23, 02:20 UTCJul 23, 03:45 UTC1h 25m
2026-07-22 CPA505 - Jul 22, 10:20 UTCJul 22, 13:55 UTC3h 35m
2026-07-22 CPA450 HKG → TPE Jul 22, 05:20 UTCJul 22, 05:25 UTC5m
2026-07-22 CPA450 HKG → TPE Jul 22, 02:20 UTCJul 22, 03:40 UTC1h 20m
2026-07-21 CPA521 NRT → HKG Jul 21, 09:20 UTCJul 21, 13:10 UTC3h 50m
2026-07-21 CPA520 HKG → NRT Jul 21, 03:40 UTCJul 21, 07:30 UTC3h 50m
2026-07-20 CPA459 KHH → HKG Jul 20, 12:45 UTCJul 20, 13:50 UTC1h 5m
2026-07-20 CPA458 HKG → KHH Jul 20, 10:20 UTCJul 20, 11:20 UTC1h 0m
2026-07-20 CPA754 BKK → HKG Jul 20, 08:05 UTCJul 20, 08:25 UTC20m
2026-07-20 CPA754 BKK → HKG Jul 20, 05:55 UTCJul 20, 06:05 UTC10m
2026-07-20 CPA755 HKG → BKK Jul 20, 04:05 UTCJul 20, 04:20 UTC15m
2026-07-20 CPA755 HKG → BKK Jul 20, 02:10 UTCJul 20, 02:20 UTC10m
2026-07-19 CPA565 TPE → HKG Jul 19, 11:55 UTCJul 19, 13:25 UTC1h 30m
2026-07-19 CPA565 TPE → HKG Jul 19, 09:50 UTCJul 19, 10:20 UTC30m
2026-07-19 CPA565 TPE → HKG Jul 19, 07:50 UTCJul 19, 08:30 UTC40m
2026-07-19 CPA564 HKG → TPE Jul 19, 03:25 UTCJul 19, 05:45 UTC2h 20m
2026-07-19 CPA564 HKG → TPE Jul 19, 00:30 UTCJul 19, 02:00 UTC1h 30m
2026-07-18 CPA798 - Jul 18, 21:25 UTCJul 18, 21:45 UTC20m
2026-07-18 CPA798 - Jul 18, 19:15 UTCJul 18, 19:40 UTC25m
2026-07-18 CPA797 - Jul 18, 15:30 UTCJul 18, 15:40 UTC10m
2026-07-18 CPA797 - Jul 18, 11:40 UTCJul 18, 11:50 UTC10m
2026-07-18 CPA754 - Jul 18, 08:40 UTCJul 18, 09:05 UTC25m
2026-07-18 CPA754 - Jul 18, 06:25 UTCJul 18, 06:35 UTC10m
2026-07-18 CPA755 HKG → BKK Jul 18, 04:20 UTCJul 18, 04:30 UTC10m
2026-07-18 CPA755 HKG → BKK Jul 18, 02:25 UTCJul 18, 02:35 UTC10m
2026-07-17 CPA974 MNL → HKG Jul 17, 21:44 UTCJul 17, 23:30 UTC1h 45m
2026-07-17 CPA913 - Jul 17, 15:15 UTCJul 17, 17:05 UTC1h 50m
2026-07-17 CPA918 - Jul 17, 11:00 UTCJul 17, 12:45 UTC1h 45m
2026-07-17 CPA919 HKG → MNL Jul 17, 06:45 UTCJul 17, 08:25 UTC1h 40m
2026-07-17 CPA431 KHH → HKG Jul 17, 03:59 UTCJul 17, 05:04 UTC1h 5m
2026-07-17 CPA432 HKG → KHH Jul 17, 01:09 UTCJul 17, 02:15 UTC1h 5m
2026-07-16 CPA507 KIX → HKG Jul 16, 12:14 UTCJul 16, 15:30 UTC3h 15m
2026-07-16 CPA506 HKG → KIX Jul 16, 07:25 UTCJul 16, 10:40 UTC3h 15m
2026-07-16 CPA543 - Jul 16, 05:00 UTCJul 16, 05:20 UTC20m
2026-07-16 CPA543 - Jul 16, 01:30 UTCJul 16, 04:25 UTC2h 55m
2026-07-15 CPA542 HKG → HND Jul 15, 10:00 UTCJul 15, 13:55 UTC3h 55m
2026-07-15 CPA766 - Jul 15, 06:45 UTCJul 15, 07:10 UTC25m
2026-07-15 CPA767 - Jul 15, 00:55 UTCJul 15, 01:05 UTC10m
2026-07-14 CPA764 - Jul 14, 13:55 UTCJul 14, 14:15 UTC20m
2026-07-14 CPA769 - Jul 14, 07:55 UTCJul 14, 08:10 UTC15m

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

Mode-S 780171 frequently asked

What is Mode-S code 780171?
780171 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HNI.
Where is Mode-S 780171 registered?
Mode-S code 780171 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780171 broadcasting right now?
Yes. Mode-S 780171 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780171, octal 36000561, decimal 7,864,689.
What flights does 780171 operate?
Mode-S 780171 has broadcast 20 distinct callsigns, including CPA565, CPA450, CPA564, CPA505, CPA521.