Apparatus

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sensors Mode-S transponder

781591

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-304L · AIRBUS A-330-300

Hex
781591
Octal
36012621
Decimal
7,869,841
Country
CN
Tail
B-304L
Type
A333
No current signal · last broadcast 2d ago
Flights observed
168
Distinct callsigns
20
Country
CN
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 781591.

Country allocation

The ICAO 24-bit address 781591 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
CHH7986 - 12 2026-06-14
CHH770 - 12 2026-06-27
CHH7985 - 10 2026-06-14
CHH7937 - 9 2026-07-10
CHH769 - 8 2026-06-26
CHH754 - 8 2026-07-12
CHH7938 - 7 2026-07-10
CHH7965 Hainan Airlines 6 2026-06-07
CHH766 Hainan Airlines 6 2026-05-23
CHH7603 - 6 2026-07-09
CHH753 - 6 2026-07-11
CHH765 Hainan Airlines 5 2026-05-23
CHH752 Hainan Airlines 4 2026-05-19
CHH408 Hainan Airlines 4 2026-06-06
CHH7966 Hainan Airlines 3 2026-06-08
CHH7813 - 3 2026-07-15
CHH7811 Hainan Airlines 3 2026-05-28
CHH751 Hainan Airlines 3 2026-05-18
CHH7146 - 3 2026-07-15
CHH407 Hainan Airlines 3 2026-06-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 CHH7813 - Jul 15, 12:05 UTCJul 15, 12:20 UTC15m
2026-07-15 CHH7146 - Jul 15, 09:35 UTCJul 15, 09:50 UTC15m
2026-07-13 CHH7813 - Jul 13, 11:55 UTCJul 13, 12:15 UTC20m
2026-07-13 CHH7146 - Jul 13, 09:10 UTCJul 13, 09:30 UTC20m
2026-07-12 CHH7145 - Jul 12, 23:50 UTCJul 13, 00:01 UTC10m
2026-07-12 CHH754 - Jul 12, 20:30 UTCJul 12, 20:45 UTC15m
2026-07-12 CHH754 - Jul 12, 11:25 UTCJul 12, 18:01 UTC6h 35m
2026-07-11 CHH753 - Jul 11, 20:00 UTCJul 12, 06:15 UTC10h 15m
2026-07-11 CHH7580 - Jul 11, 15:35 UTCJul 11, 16:00 UTC25m
2026-07-11 CHH7580 - Jul 11, 14:45 UTCJul 11, 15:05 UTC20m
2026-07-11 CHH7279 - Jul 11, 05:25 UTCJul 11, 08:30 UTC3h 5m
2026-07-10 CHH7938 - Jul 10, 20:35 UTCJul 10, 21:10 UTC35m
2026-07-10 CHH7938 - Jul 10, 12:15 UTCJul 10, 13:55 UTC1h 40m
2026-07-10 CHH7937 - Jul 10, 04:00 UTCJul 10, 04:15 UTC15m
2026-07-09 CHH7937 - Jul 9, 22:10 UTCJul 9, 23:00 UTC50m
2026-07-09 CHH7937 - Jul 9, 19:00 UTCJul 9, 19:10 UTC10m
2026-07-09 CHH7606 - Jul 9, 06:05 UTCJul 9, 06:15 UTC10m
2026-07-09 CHH7603 - Jul 9, 01:05 UTCJul 9, 01:15 UTC10m
2026-07-08 CHH7938 - Jul 8, 12:10 UTCJul 8, 13:50 UTC1h 40m
2026-07-07 CHH7937 - Jul 7, 20:15 UTCJul 8, 00:00 UTC3h 45m
2026-07-07 CHH7605 - Jul 7, 12:10 UTCJul 7, 12:35 UTC25m
2026-07-06 CHH754 MAN → PEK Jul 6, 11:30 UTCJul 6, 20:55 UTC9h 25m
2026-07-05 CHH753 PEK → MAN Jul 5, 19:40 UTCJul 6, 05:35 UTC9h 55m
2026-07-05 CHH7714 - Jul 5, 14:50 UTCJul 5, 15:00 UTC10m
2026-07-05 CHH7709 - Jul 5, 08:30 UTCJul 5, 08:45 UTC15m
2026-07-05 CHH7601 - Jul 5, 00:05 UTCJul 5, 00:20 UTC15m
2026-07-04 CHH7847 - Jul 4, 08:50 UTCJul 4, 09:10 UTC20m
2026-07-01 CHH7938 - Jul 1, 12:20 UTCJul 1, 20:55 UTC8h 35m
2026-06-30 CHH7937 - Jun 30, 20:30 UTCJul 1, 06:00 UTC9h 30m
2026-06-30 CHH7607 - Jun 30, 09:10 UTCJun 30, 09:25 UTC15m
2026-06-29 CHH7813 - Jun 29, 11:50 UTCJun 29, 12:09 UTC20m
2026-06-29 CHH7146 - Jun 29, 09:14 UTCJun 29, 09:34 UTC20m
2026-06-28 CHH7567 - Jun 28, 11:19 UTCJun 28, 11:50 UTC30m
2026-06-28 CHH7277 - Jun 28, 00:15 UTCJun 28, 00:25 UTC10m
2026-06-27 CHH770 - Jun 27, 19:39 UTCJun 27, 19:55 UTC15m
2026-06-27 CHH770 - Jun 27, 11:44 UTCJun 27, 17:04 UTC5h 20m
2026-06-26 CHH769 - Jun 26, 19:35 UTCJun 27, 04:24 UTC8h 50m
2026-06-26 CHH7607 - Jun 26, 09:20 UTCJun 26, 09:30 UTC10m
2026-06-26 CHH7603 - Jun 26, 01:05 UTCJun 26, 01:15 UTC10m
2026-06-25 CHH770 - Jun 25, 20:09 UTCJun 25, 20:25 UTC15m
2026-06-25 CHH770 - Jun 25, 11:59 UTCJun 25, 17:25 UTC5h 25m
2026-06-24 CHH769 - Jun 24, 19:44 UTCJun 25, 04:14 UTC8h 30m
2026-06-24 CHH7246 - Jun 24, 15:00 UTCJun 24, 15:14 UTC15m
2026-06-24 CHH7245 PEK → URC Jun 24, 06:29 UTCJun 24, 06:50 UTC20m
2026-06-23 CHH754 MAN → PEK Jun 23, 20:24 UTCJun 23, 20:40 UTC15m
2026-06-23 CHH754 MAN → PEK Jun 23, 11:24 UTCJun 23, 17:54 UTC6h 30m
2026-06-22 CHH753 PEK → MAN Jun 22, 22:49 UTCJun 23, 05:39 UTC6h 50m
2026-06-22 CHH7568 - Jun 22, 09:24 UTCJun 22, 09:34 UTC10m
2026-06-20 CHH7851 URC → LHW Jun 20, 23:04 UTCJun 20, 23:19 UTC15m
2026-06-20 CHH7707 - Jun 20, 05:49 UTCJun 20, 06:14 UTC25m

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-304L page for operator, model, and routing details .

Mode-S 781591 frequently asked

What is Mode-S code 781591?
781591 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-304L.
Where is Mode-S 781591 registered?
Mode-S code 781591 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781591 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781591, octal 36012621, decimal 7,869,841.
What flights does 781591 operate?
Mode-S 781591 has broadcast 20 distinct callsigns, including CHH7986, CHH770, CHH7985, CHH7937, CHH769.