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sensors Mode-S transponder

7801AF

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-HNM · BOEING 777-300

Hex
7801AF
Octal
36000657
Decimal
7,864,751
Country
CN
Tail
B-HNM
Type
B773
No current signal · last broadcast Jul 26, 16:30 UTC
Flights observed
446
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 16:30 UTC

Last known position

Most recent position reported by Mode-S 7801AF.

Country allocation

The ICAO 24-bit address 7801AF 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
CPA798 - 28 2026-07-01
CPA718 - 24 2026-07-16
CPA543 - 24 2026-07-15
CPA542 - 23 2026-07-14
CPA451 - 22 2026-07-13
CPA411 Cathay Pacific 22 2026-07-21
CPA719 - 21 2026-07-15
CPA797 - 20 2026-07-01
CPA507 Cathay Pacific 14 2026-07-25
CPA410 Cathay Pacific 13 2026-07-21
CPA919 - 12 2026-06-15
CPA504 - 11 2026-07-13
CPA450 Cathay Pacific 11 2026-05-25
CPA918 Cathay Pacific 10 2026-06-15
CPA565 - 10 2026-06-26
CPA506 Cathay Pacific 10 2026-07-25
CPA303 - 10 2026-07-07
CPA302 - 10 2026-07-22
CPA362 - 9 2026-07-07
CPA930 - 8 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CPA979 XMN → HKG Jul 26, 16:10 UTCJul 26, 16:20 UTC10m
2026-07-26 CPA978 HKG → XMN Jul 26, 12:20 UTCJul 26, 12:30 UTC10m
2026-07-25 CPA507 KIX → HKG Jul 25, 09:25 UTCJul 25, 12:55 UTC3h 30m
2026-07-25 CPA506 HKG → KIX Jul 25, 03:45 UTCJul 25, 07:05 UTC3h 20m
2026-07-23 CPA521 NRT → HKG Jul 23, 09:30 UTCJul 23, 13:15 UTC3h 45m
2026-07-23 CPA520 HKG → NRT Jul 23, 03:35 UTCJul 23, 07:35 UTC4h 0m
2026-07-22 CPA302 - Jul 22, 14:15 UTCJul 23, 01:40 UTC11h 25m
2026-07-22 CPA507 KIX → HKG Jul 22, 12:10 UTCJul 22, 12:30 UTC20m
2026-07-22 CPA506 HKG → KIX Jul 22, 03:55 UTCJul 22, 11:40 UTC7h 45m
2026-07-21 CPA302 HKG → HKG Jul 21, 13:20 UTCJul 22, 01:40 UTC12h 20m
2026-07-21 CPA411 ICN → HKG Jul 21, 08:25 UTCJul 21, 09:50 UTC1h 25m
2026-07-21 CPA411 ICN → HKG Jul 21, 06:45 UTCJul 21, 07:20 UTC35m
2026-07-21 CPA410 HKG → ICN Jul 21, 02:10 UTCJul 21, 05:20 UTC3h 10m
2026-07-20 CPA784 - Jul 20, 13:45 UTCJul 20, 13:55 UTC10m
2026-07-20 CPA785 HKG → DPS Jul 20, 03:00 UTCJul 20, 11:45 UTC8h 45m
2026-07-19 CPA521 - Jul 19, 12:50 UTCJul 19, 13:05 UTC15m
2026-07-19 CPA521 - Jul 19, 09:00 UTCJul 19, 12:10 UTC3h 10m
2026-07-19 CPA520 HKG → NRT Jul 19, 03:15 UTCJul 19, 07:10 UTC3h 55m
2026-07-18 CPA361D - Jul 18, 22:30 UTCJul 18, 23:45 UTC1h 15m
2026-07-16 CPA360 - Jul 16, 07:45 UTCJul 16, 09:05 UTC1h 20m
2026-07-16 CPA718 - Jul 16, 05:30 UTCJul 16, 05:50 UTC20m
2026-07-16 CPA718 - Jul 16, 01:20 UTCJul 16, 02:45 UTC1h 25m
2026-07-15 CPA719 - Jul 15, 13:50 UTCJul 15, 14:00 UTC10m
2026-07-15 CPA719 - Jul 15, 09:55 UTCJul 15, 10:05 UTC10m
2026-07-15 CPA543 - Jul 15, 05:25 UTCJul 15, 05:40 UTC15m
2026-07-15 CPA543 - Jul 15, 01:50 UTCJul 15, 04:50 UTC3h 0m
2026-07-14 CPA542 HKG → HND Jul 14, 08:35 UTCJul 14, 12:30 UTC3h 55m
2026-07-14 CPA766 - Jul 14, 06:40 UTCJul 14, 07:00 UTC20m
2026-07-14 CPA767 - Jul 14, 00:40 UTCJul 14, 00:55 UTC15m
2026-07-13 CPA451 - Jul 13, 11:55 UTCJul 13, 13:15 UTC1h 20m
2026-07-13 CPA451 NRT → TPE Jul 13, 07:20 UTCJul 13, 10:05 UTC2h 45m
2026-07-13 CPA504 - Jul 13, 01:30 UTCJul 13, 05:20 UTC3h 50m
2026-07-12 CPA451 - Jul 12, 12:01 UTCJul 12, 13:15 UTC1h 15m
2026-07-12 CPA451 NRT → TPE Jul 12, 07:35 UTCJul 12, 10:30 UTC2h 55m
2026-07-12 CPA504 - Jul 12, 02:25 UTCJul 12, 05:25 UTC3h 0m
2026-07-12 CPA504 - Jul 12, 01:30 UTCJul 12, 01:50 UTC20m
2026-07-11 CPA974 - Jul 11, 23:00 UTCJul 11, 23:15 UTC15m
2026-07-11 CPA974 - Jul 11, 21:40 UTCJul 11, 22:10 UTC30m
2026-07-11 CPA913 - Jul 11, 14:00 UTCJul 11, 14:40 UTC40m
2026-07-11 CPA913 - Jul 11, 12:55 UTCJul 11, 13:10 UTC15m
2026-07-11 CPA718 - Jul 11, 05:20 UTCJul 11, 05:35 UTC15m
2026-07-11 CPA718 - Jul 11, 03:10 UTCJul 11, 03:35 UTC25m
2026-07-10 CPA719 - Jul 10, 12:05 UTCJul 10, 12:15 UTC10m
2026-07-10 CPA719 - Jul 10, 08:15 UTCJul 10, 08:25 UTC10m
2026-07-10 CPA718 - Jul 10, 05:35 UTCJul 10, 05:50 UTC15m
2026-07-10 CPA718 - Jul 10, 01:30 UTCJul 10, 02:45 UTC1h 15m
2026-07-09 CPA719 - Jul 9, 12:10 UTCJul 9, 12:25 UTC15m
2026-07-09 CPA719 - Jul 9, 08:20 UTCJul 9, 08:30 UTC10m
2026-07-08 CPA302 HKG → HKG Jul 8, 14:10 UTCJul 9, 06:10 UTC16h 0m
2026-07-08 CPA507 KIX → HKG Jul 8, 09:05 UTCJul 8, 12:15 UTC3h 10m

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

Mode-S 7801AF frequently asked

What is Mode-S code 7801AF?
7801AF is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-HNM.
Where is Mode-S 7801AF registered?
Mode-S code 7801AF is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7801AF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 16:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7801AF, octal 36000657, decimal 7,864,751.
What flights does 7801AF operate?
Mode-S 7801AF has broadcast 20 distinct callsigns, including CPA798, CPA718, CPA543, CPA542, CPA451.