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 Apr 26, 13:55 UTC
Flights observed
68
Distinct callsigns
20
Country
CN
Last broadcast
Apr 26, 13:55 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
CPA450 Cathay Pacific 7 2026-04-16
CPA505 Cathay Pacific 5 2026-04-16
CPA974 Cathay Pacific 4 2026-04-23
CPA948 Cathay Pacific 4 2026-04-25
CPA913 Cathay Pacific 4 2026-04-23
CPA589 Cathay Pacific 4 2026-04-20
CPA451 Cathay Pacific 4 2026-04-26
CPA921 Cathay Pacific 3 2026-04-25
CPA588 Cathay Pacific 3 2026-04-20
CPA973 Cathay Pacific 2 2026-04-24
CPA970 Cathay Pacific 2 2026-04-24
CPA919 Cathay Pacific 2 2026-04-17
CPA918 Cathay Pacific 2 2026-04-17
CPA507 - 2 2026-04-14
CPA469 Cathay Pacific 2 2026-04-19
CPA411 Cathay Pacific 2 2026-04-21
CPA410 Cathay Pacific 2 2026-04-21
CPA979 - 1 2026-04-15
CPA978 Cathay Pacific 1 2026-04-15
CPA907 Cathay Pacific 1 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-04-26 CPA451 TPE → HKG Apr 26, 13:20 UTCApr 26, 13:40 UTC20m
2026-04-26 CPA451 TPE → HKG Apr 26, 12:15 UTCApr 26, 12:45 UTC30m
2026-04-26 CPA451 TPE → HKG Apr 26, 10:20 UTCApr 26, 10:50 UTC30m
2026-04-26 CPA451 TPE → HKG Apr 26, 07:30 UTCApr 26, 08:55 UTC1h 25m
2026-04-26 CPA504 HKG → NRT Apr 26, 02:00 UTCApr 26, 05:35 UTC3h 35m
2026-04-25 CPA902 MNL → HKG Apr 25, 13:15 UTCApr 25, 15:00 UTC1h 45m
2026-04-25 CPA903 HKG → MNL Apr 25, 09:35 UTCApr 25, 11:20 UTC1h 45m
2026-04-25 CPA948 CEB → HKG Apr 25, 06:50 UTCApr 25, 07:05 UTC15m
2026-04-25 CPA948 CEB → HKG Apr 25, 01:50 UTCApr 25, 06:20 UTC4h 30m
2026-04-25 CPA921 HKG → CEB Apr 25, 00:45 UTCApr 25, 01:05 UTC20m
2026-04-24 CPA764 SGN → HKG Apr 24, 13:55 UTCApr 24, 14:05 UTC10m
2026-04-24 CPA769 HKG → SGN Apr 24, 08:25 UTCApr 24, 08:40 UTC15m
2026-04-24 CPA973 XMN → HKG Apr 24, 05:50 UTCApr 24, 06:15 UTC25m
2026-04-24 CPA970 HKG → XMN Apr 24, 02:05 UTCApr 24, 02:15 UTC10m
2026-04-23 CPA974 MNL → HKG Apr 23, 23:25 UTCApr 23, 23:40 UTC15m
2026-04-23 CPA974 MNL → HKG Apr 23, 22:00 UTCApr 23, 22:45 UTC45m
2026-04-23 CPA913 HKG → MNL Apr 23, 13:10 UTCApr 23, 14:45 UTC1h 35m
2026-04-23 CPA543 HND → HKG Apr 23, 02:30 UTCApr 23, 06:35 UTC4h 5m
2026-04-22 CPA542 HKG → HND Apr 22, 08:45 UTCApr 22, 12:20 UTC3h 35m
2026-04-22 CPA361 PVG → HKG Apr 22, 02:45 UTCApr 22, 03:00 UTC15m
2026-04-21 CPA362 HKG → PVG Apr 21, 12:15 UTCApr 22, 02:05 UTC13h 50m
2026-04-21 CPA411 ICN → HKG Apr 21, 09:25 UTCApr 21, 09:35 UTC10m
2026-04-21 CPA411 ICN → HKG Apr 21, 06:30 UTCApr 21, 08:45 UTC2h 15m
2026-04-21 CPA410 HKG → ICN Apr 21, 02:35 UTCApr 21, 04:40 UTC2h 5m
2026-04-21 CPA410 HKG → ICN Apr 21, 01:45 UTCApr 21, 02:05 UTC20m
2026-04-20 CPA974 MNL → HKG Apr 20, 21:50 UTCApr 20, 23:25 UTC1h 35m
2026-04-20 CPA913 HKG → MNL Apr 20, 14:20 UTCApr 20, 15:00 UTC40m
2026-04-20 CPA913 HKG → MNL Apr 20, 13:20 UTCApr 20, 13:35 UTC15m
2026-04-20 CPA589 FUK → HKG Apr 20, 09:45 UTCApr 20, 11:15 UTC1h 30m
2026-04-20 CPA588 HKG → FUK Apr 20, 03:15 UTCApr 20, 04:35 UTC1h 20m
2026-04-19 CPA469 TPE → HKG Apr 19, 15:25 UTCApr 19, 15:45 UTC20m
2026-04-19 CPA469 TPE → HKG Apr 19, 14:20 UTCApr 19, 14:50 UTC30m
2026-04-19 CPA464 HKG → TPE Apr 19, 11:55 UTCApr 19, 12:55 UTC1h 0m
2026-04-19 CPA973 XMN → HKG Apr 19, 05:25 UTCApr 19, 05:45 UTC20m
2026-04-19 CPA970 HKG → XMN Apr 19, 01:50 UTCApr 19, 02:00 UTC10m
2026-04-18 CPA974 MNL → HKG Apr 18, 22:20 UTCApr 19, 00:00 UTC1h 40m
2026-04-18 CPA913 HKG → MNL Apr 18, 13:00 UTCApr 18, 14:40 UTC1h 40m
2026-04-18 CPA589 FUK → HKG Apr 18, 11:00 UTCApr 18, 11:15 UTC15m
2026-04-18 CPA589 FUK → HKG Apr 18, 09:40 UTCApr 18, 10:20 UTC40m
2026-04-18 CPA589 FUK → HKG Apr 18, 08:10 UTCApr 18, 08:20 UTC10m
2026-04-18 CPA588 HKG → FUK Apr 18, 04:45 UTCApr 18, 05:05 UTC20m
2026-04-18 CPA588 HKG → FUK Apr 18, 03:45 UTCApr 18, 05:05 UTC1h 20m
2026-04-17 CPA918 MNL → HKG Apr 17, 11:25 UTCApr 17, 11:50 UTC25m
2026-04-17 CPA918 MNL → HKG Apr 17, 10:00 UTCApr 17, 11:05 UTC1h 5m
2026-04-17 CPA919 HKG → MNL Apr 17, 07:20 UTCApr 17, 08:10 UTC50m
2026-04-17 CPA919 HKG → MNL Apr 17, 06:35 UTCApr 17, 07:15 UTC40m
2026-04-17 CPA906 MNL → HKG Apr 17, 03:20 UTCApr 17, 05:00 UTC1h 41m
2026-04-16 CPA907 HKG → MNL Apr 16, 23:40 UTCApr 17, 01:15 UTC1h 35m
2026-04-16 CPA505 NRT → HKG Apr 16, 15:35 UTCApr 16, 15:55 UTC20m
2026-04-16 CPA505 NRT → HKG Apr 16, 14:20 UTCApr 16, 15:05 UTC45m

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 Apr 26, 13:55 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 CPA450, CPA505, CPA974, CPA948, CPA913.