Apparatus

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sensors Mode-S transponder

7801B0

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-HNN · BOEING 777-300

Hex
7801B0
Octal
36000660
Decimal
7,864,752
Country
CN
Tail
B-HNN
Type
B773
No current signal · last broadcast 32m ago
Flights observed
197
Distinct callsigns
20
Country
CN
Last broadcast
32m ago

Last known position

Most recent position reported by Mode-S 7801B0.

Country allocation

The ICAO 24-bit address 7801B0 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 - 15 2026-06-28
CPA565 - 13 2026-06-30
CPA564 - 9 2026-06-30
CPA719 - 8 2026-07-08
CPA918 - 7 2026-06-25
CPA450 Cathay Pacific 7 2026-04-16
CPA919 - 6 2026-06-25
CPA740 - 6 2026-07-05
CPA718 - 6 2026-07-09
CPA973 - 5 2026-07-08
CPA970 - 5 2026-07-08
CPA505 Cathay Pacific 5 2026-04-16
CPA504 - 5 2026-06-28
CPA974 Cathay Pacific 4 2026-04-23
CPA948 Cathay Pacific 4 2026-04-25
CPA930 - 4 2026-07-12
CPA913 Cathay Pacific 4 2026-04-23
CPA798 - 4 2026-07-04
CPA741 - 4 2026-07-05
CPA589 Cathay Pacific 4 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CPA420 HKG → TPE Jul 14, 06:25 UTCJul 14, 07:50 UTC1h 25m
2026-07-13 CPA361 HKG → HKG Jul 13, 11:45 UTCJul 14, 02:55 UTC15h 10m
2026-07-13 CPA411 - Jul 13, 06:40 UTCJul 13, 09:50 UTC3h 10m
2026-07-13 CPA410 HKG → ICN Jul 13, 01:55 UTCJul 13, 05:05 UTC3h 10m
2026-07-12 CPA979 - Jul 12, 13:30 UTCJul 12, 14:10 UTC40m
2026-07-12 CPA978 - Jul 12, 10:15 UTCJul 12, 10:30 UTC15m
2026-07-12 CPA930 - Jul 12, 07:01 UTCJul 12, 07:15 UTC15m
2026-07-12 CPA930 - Jul 12, 05:40 UTCJul 12, 06:10 UTC30m
2026-07-12 CPA901 - Jul 12, 03:05 UTCJul 12, 03:40 UTC35m
2026-07-12 CPA901 - Jul 12, 01:55 UTCJul 12, 02:15 UTC20m
2026-07-11 CPA930 - Jul 11, 06:20 UTCJul 11, 06:35 UTC15m
2026-07-11 CPA930 - Jul 11, 04:55 UTCJul 11, 05:20 UTC25m
2026-07-11 CPA901 HKG → MNL Jul 11, 01:30 UTCJul 11, 03:15 UTC1h 45m
2026-07-10 CPA521 NRT → HKG Jul 10, 10:00 UTCJul 10, 13:50 UTC3h 50m
2026-07-10 CPA520 HKG → NRT Jul 10, 04:15 UTCJul 10, 08:05 UTC3h 50m
2026-07-09 CPA507 - Jul 9, 12:20 UTCJul 9, 15:30 UTC3h 10m
2026-07-09 CPA506 HKG → KIX Jul 9, 07:25 UTCJul 9, 10:40 UTC3h 15m
2026-07-09 CPA718 - Jul 9, 05:15 UTCJul 9, 05:30 UTC15m
2026-07-09 CPA718 - Jul 9, 03:00 UTCJul 9, 03:25 UTC25m
2026-07-08 CPA719 - Jul 8, 12:50 UTCJul 8, 13:00 UTC10m
2026-07-08 CPA719 - Jul 8, 08:55 UTCJul 8, 09:10 UTC15m
2026-07-08 CPA973 - Jul 8, 05:30 UTCJul 8, 06:20 UTC50m
2026-07-08 CPA970 - Jul 8, 02:10 UTCJul 8, 02:25 UTC15m
2026-07-07 CPA381 - Jul 7, 07:15 UTCJul 7, 13:55 UTC6h 40m
2026-07-07 CPA543 HND → HKG Jul 7, 01:40 UTCJul 7, 05:15 UTC3h 35m
2026-07-06 CPA542 HKG → HND Jul 6, 08:45 UTCJul 6, 12:20 UTC3h 35m
2026-07-06 CPA718 - Jul 6, 05:30 UTCJul 6, 05:50 UTC20m
2026-07-06 CPA718 - Jul 6, 03:05 UTCJul 6, 03:30 UTC25m
2026-07-05 CPA719 - Jul 5, 12:00 UTCJul 5, 12:15 UTC15m
2026-07-05 CPA719 - Jul 5, 08:10 UTCJul 5, 08:20 UTC10m
2026-07-05 CPA740 - Jul 5, 05:25 UTCJul 5, 06:05 UTC40m
2026-07-05 CPA740 - Jul 5, 04:25 UTCJul 5, 04:35 UTC10m
2026-07-05 CPA741 - Jul 5, 01:15 UTCJul 5, 01:30 UTC15m
2026-07-04 CPA798 - Jul 4, 22:15 UTCJul 4, 22:30 UTC15m
2026-07-04 CPA798 - Jul 4, 19:55 UTCJul 4, 20:25 UTC30m
2026-07-04 CPA797 - Jul 4, 15:45 UTCJul 4, 16:00 UTC15m
2026-07-04 CPA797 - Jul 4, 12:00 UTCJul 4, 12:15 UTC15m
2026-07-04 CPA973 - Jul 4, 05:45 UTCJul 4, 06:05 UTC20m
2026-07-04 CPA970 - Jul 4, 02:00 UTCJul 4, 02:15 UTC15m
2026-07-03 CPA784 - Jul 3, 12:35 UTCJul 3, 12:55 UTC20m
2026-07-03 CPA785 - Jul 3, 02:55 UTCJul 3, 10:50 UTC7h 55m
2026-07-02 CPA521 - Jul 2, 13:45 UTCJul 2, 14:05 UTC20m
2026-07-02 CPA521 - Jul 2, 10:05 UTCJul 2, 13:05 UTC3h 0m
2026-07-02 CPA520 - Jul 2, 04:35 UTCJul 2, 07:30 UTC2h 55m
2026-07-02 CPA520 - Jul 2, 03:40 UTCJul 2, 04:00 UTC20m
2026-07-02 CPA303 - Jul 2, 01:15 UTCJul 2, 01:30 UTC15m
2026-07-01 CPA303 - Jul 1, 15:30 UTCJul 2, 00:30 UTC9h 0m
2026-07-01 CPA302 - Jul 1, 14:30 UTCJul 1, 14:40 UTC10m
2026-07-01 CPA459 - Jul 1, 11:40 UTCJul 1, 12:50 UTC1h 10m
2026-07-01 CPA458 HKG → KHH Jul 1, 09:15 UTCJul 1, 10:20 UTC1h 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-HNN page for operator, model, and routing details .

Mode-S 7801B0 frequently asked

What is Mode-S code 7801B0?
7801B0 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HNN.
Where is Mode-S 7801B0 registered?
Mode-S code 7801B0 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7801B0 broadcasting right now?
No active broadcast right now. Last signal was 32m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7801B0, octal 36000660, decimal 7,864,752.
What flights does 7801B0 operate?
Mode-S 7801B0 has broadcast 20 distinct callsigns, including CPA451, CPA565, CPA564, CPA719, CPA918.