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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 Jul 26, 11:20 UTC
Flights observed
246
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 11:20 UTC

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 Cathay Pacific 18 2026-07-24
CPA565 - 13 2026-06-30
CPA798 Cathay Pacific 10 2026-07-23
CPA719 - 10 2026-07-16
CPA564 - 9 2026-06-30
CPA450 Cathay Pacific 9 2026-07-19
CPA797 Cathay Pacific 8 2026-07-25
CPA740 - 8 2026-07-16
CPA718 Cathay Pacific 8 2026-07-26
CPA974 Cathay Pacific 7 2026-07-21
CPA918 - 7 2026-06-25
CPA504 Cathay Pacific 7 2026-07-24
CPA930 Cathay Pacific 6 2026-07-25
CPA919 - 6 2026-06-25
CPA913 Cathay Pacific 6 2026-07-21
CPA505 - 6 2026-07-19
CPA973 - 5 2026-07-08
CPA970 - 5 2026-07-08
CPA785 Cathay Pacific 5 2026-07-18
CPA741 - 5 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CPA718 CGK → HKG Jul 26, 10:50 UTCJul 26, 11:05 UTC15m
2026-07-26 CPA718 CGK → HKG Jul 26, 06:40 UTCJul 26, 08:05 UTC1h 25m
2026-07-25 CPA797 HKG → CGK Jul 25, 15:50 UTCJul 25, 16:05 UTC15m
2026-07-25 CPA797 HKG → CGK Jul 25, 12:05 UTCJul 25, 12:15 UTC10m
2026-07-25 CPA930 MNL → HKG Jul 25, 08:50 UTCJul 25, 08:55 UTC5m
2026-07-25 CPA930 MNL → HKG Jul 25, 06:40 UTCJul 25, 07:05 UTC25m
2026-07-25 CPA901 HKG → MNL Jul 25, 03:15 UTCJul 25, 05:10 UTC1h 55m
2026-07-24 CPA451 TPE → HKG Jul 24, 12:45 UTCJul 24, 14:00 UTC1h 15m
2026-07-24 CPA451 TPE → HKG Jul 24, 07:40 UTCJul 24, 10:50 UTC3h 10m
2026-07-24 CPA504 HKG → NRT Jul 24, 02:00 UTCJul 24, 05:55 UTC3h 55m
2026-07-23 CPA798 CGK → HKG Jul 23, 21:45 UTCJul 23, 22:00 UTC15m
2026-07-23 CPA798 CGK → HKG Jul 23, 17:40 UTCJul 23, 18:55 UTC1h 15m
2026-07-23 CPA797 HKG → CGK Jul 23, 15:45 UTCJul 23, 16:00 UTC15m
2026-07-23 CPA797 HKG → CGK Jul 23, 11:50 UTCJul 23, 12:05 UTC15m
2026-07-23 CPA766 SGN → HKG Jul 23, 06:25 UTCJul 23, 06:45 UTC20m
2026-07-23 CPA767 HKG → SGN Jul 23, 00:50 UTCJul 23, 01:05 UTC15m
2026-07-22 CPA451 TPE → HKG Jul 22, 11:45 UTCJul 22, 12:55 UTC1h 10m
2026-07-22 CPA504 HKG → NRT Jul 22, 01:25 UTCJul 22, 05:15 UTC3h 50m
2026-07-21 CPA974 MNL → HKG Jul 21, 21:50 UTCJul 21, 23:25 UTC1h 35m
2026-07-21 CPA913 HKG → MNL Jul 21, 12:50 UTCJul 21, 14:35 UTC1h 45m
2026-07-21 CPA421 TPE → HKG Jul 21, 09:00 UTCJul 21, 10:10 UTC1h 10m
2026-07-21 CPA420 HKG → TPE Jul 21, 06:15 UTCJul 21, 07:40 UTC1h 25m
2026-07-20 CPA361 PVG → HKG Jul 20, 12:05 UTCJul 21, 03:00 UTC14h 54m
2026-07-20 CPA411 ICN → HKG Jul 20, 07:00 UTCJul 20, 10:00 UTC3h 0m
2026-07-20 CPA410 HKG → ICN Jul 20, 02:15 UTCJul 20, 05:20 UTC3h 5m
2026-07-19 CPA505 NRT → HKG Jul 19, 10:20 UTCJul 19, 14:05 UTC3h 45m
2026-07-19 CPA450 HKG → TPE Jul 19, 05:40 UTCJul 19, 08:30 UTC2h 50m
2026-07-19 CPA450 HKG → TPE Jul 19, 02:45 UTCJul 19, 04:15 UTC1h 30m
2026-07-18 CPA784 - Jul 18, 12:40 UTCJul 18, 13:10 UTC30m
2026-07-18 CPA785 HKG → DPS Jul 18, 02:40 UTCJul 18, 10:50 UTC8h 11m
2026-07-17 CPA798 - Jul 17, 22:20 UTCJul 17, 22:29 UTC10m
2026-07-17 CPA798 - Jul 17, 18:10 UTCJul 17, 19:40 UTC1h 30m
2026-07-17 CPA797 - Jul 17, 16:04 UTCJul 17, 16:15 UTC10m
2026-07-17 CPA797 - Jul 17, 12:15 UTCJul 17, 12:30 UTC15m
2026-07-17 CPA411 ICN → HKG Jul 17, 07:14 UTCJul 17, 10:15 UTC3h 0m
2026-07-17 CPA410 HKG → ICN Jul 17, 02:25 UTCJul 17, 05:30 UTC3h 5m
2026-07-16 CPA798 - Jul 16, 21:45 UTCJul 16, 22:05 UTC20m
2026-07-16 CPA798 - Jul 16, 17:35 UTCJul 16, 18:59 UTC1h 25m
2026-07-16 CPA719 - Jul 16, 13:00 UTCJul 16, 13:15 UTC15m
2026-07-16 CPA719 - Jul 16, 09:00 UTCJul 16, 09:15 UTC15m
2026-07-16 CPA740 - Jul 16, 06:00 UTCJul 16, 06:55 UTC55m
2026-07-16 CPA740 - Jul 16, 04:55 UTCJul 16, 05:05 UTC10m
2026-07-16 CPA741 - Jul 16, 01:35 UTCJul 16, 01:50 UTC15m
2026-07-15 CPA784 - Jul 15, 12:55 UTCJul 15, 13:05 UTC10m
2026-07-15 CPA785 - Jul 15, 02:30 UTCJul 15, 11:50 UTC9h 20m
2026-07-14 CPA974 - Jul 14, 23:35 UTCJul 14, 23:50 UTC15m
2026-07-14 CPA974 - Jul 14, 22:10 UTCJul 14, 22:45 UTC34m
2026-07-14 CPA913 HKG → MNL Jul 14, 13:05 UTCJul 14, 14:45 UTC1h 40m
2026-07-14 CPA421 - Jul 14, 10:00 UTCJul 14, 11:15 UTC1h 15m
2026-07-14 CPA420 HKG → TPE Jul 14, 06:25 UTCJul 14, 07:50 UTC1h 25m

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 Jul 26, 11:20 UTC.
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, CPA798, CPA719, CPA564.