Apparatus

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sensors Mode-S transponder

7812A4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1020 · AIRBUS A-330-300

Hex
7812A4
Octal
36011244
Decimal
7,869,092
Country
CN
Tail
B-1020
Type
A333
No current signal · last broadcast 2d ago
Flights observed
171
Distinct callsigns
20
Country
CN
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 7812A4.

Country allocation

The ICAO 24-bit address 7812A4 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
CHH754 Hainan Airlines 23 2026-07-07
CHH753 Hainan Airlines 23 2026-07-06
CHH408 Hainan Airlines 9 2026-06-12
CHH407 Hainan Airlines 9 2026-06-11
CHH7985 - 7 2026-07-05
CHH770 - 7 2026-07-09
CHH769 - 7 2026-07-08
CHH752 - 7 2026-06-27
CHH7986 - 6 2026-07-06
CHH7938 Hainan Airlines 4 2026-05-29
CHH751 - 4 2026-06-26
CHH7277 - 4 2026-07-08
CHH7966 - 3 2026-06-25
CHH7937 Hainan Airlines 3 2026-05-29
CHH7801 Hainan Airlines 3 2026-05-18
CHH7607 - 3 2026-06-29
CHH7603 - 3 2026-07-01
CHH7847 - 2 2026-07-06
CHH7813 Hainan Airlines 2 2026-05-03
CHH7803 Hainan Airlines 2 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 CHH7145 - Jul 11, 23:55 UTCJul 12, 00:10 UTC15m
2026-07-11 CHH6223 - Jul 11, 02:20 UTCJul 11, 02:40 UTC20m
2026-07-10 CHH6224 PEK → URC Jul 10, 14:40 UTCJul 10, 15:00 UTC20m
2026-07-10 CHH7189 - Jul 10, 00:55 UTCJul 10, 01:15 UTC20m
2026-07-09 CHH770 - Jul 9, 19:45 UTCJul 9, 19:55 UTC10m
2026-07-09 CHH770 - Jul 9, 12:00 UTCJul 9, 17:15 UTC5h 15m
2026-07-08 CHH769 - Jul 8, 23:05 UTCJul 9, 04:50 UTC5h 45m
2026-07-08 CHH769 - Jul 8, 19:50 UTCJul 8, 20:05 UTC15m
2026-07-08 CHH7277 - Jul 8, 00:15 UTCJul 8, 00:25 UTC10m
2026-07-07 CHH754 MAN → PEK Jul 7, 20:25 UTCJul 7, 20:45 UTC20m
2026-07-07 CHH754 MAN → PEK Jul 7, 11:25 UTCJul 7, 18:00 UTC6h 35m
2026-07-06 CHH753 PEK → MAN Jul 6, 19:50 UTCJul 6, 23:25 UTC3h 35m
2026-07-06 CHH7848 - Jul 6, 14:20 UTCJul 6, 14:45 UTC25m
2026-07-06 CHH7847 - Jul 6, 08:20 UTCJul 6, 08:30 UTC10m
2026-07-06 CHH7986 - Jul 6, 00:00 UTCJul 6, 00:15 UTC15m
2026-07-05 CHH7986 - Jul 5, 17:45 UTCJul 5, 21:30 UTC3h 45m
2026-07-05 CHH7985 - Jul 5, 09:55 UTCJul 5, 10:40 UTC45m
2026-07-05 CHH7985 - Jul 5, 06:40 UTCJul 5, 06:50 UTC10m
2026-07-04 CHH7986 - Jul 4, 23:50 UTCJul 5, 00:10 UTC20m
2026-07-04 CHH7985 - Jul 4, 09:50 UTCJul 4, 21:25 UTC11h 35m
2026-07-04 CHH7985 - Jul 4, 06:35 UTCJul 4, 06:50 UTC15m
2026-07-04 CHH7986 - Jul 4, 00:00 UTCJul 4, 00:20 UTC20m
2026-07-03 CHH7985 - Jul 3, 10:25 UTCJul 3, 21:35 UTC11h 10m
2026-07-03 CHH7985 - Jul 3, 07:05 UTCJul 3, 07:15 UTC10m
2026-07-02 CHH754 MAN → PEK Jul 2, 20:00 UTCJul 2, 20:20 UTC20m
2026-07-02 CHH754 MAN → PEK Jul 2, 11:20 UTCJul 2, 17:35 UTC6h 15m
2026-07-01 CHH753 PEK → MAN Jul 1, 19:30 UTCJul 2, 06:15 UTC10h 45m
2026-07-01 CHH7847 - Jul 1, 08:30 UTCJul 1, 08:50 UTC20m
2026-07-01 CHH7603 - Jul 1, 01:10 UTCJul 1, 01:25 UTC15m
2026-06-30 CHH770 - Jun 30, 19:45 UTCJun 30, 20:00 UTC15m
2026-06-30 CHH770 - Jun 30, 11:55 UTCJun 30, 17:10 UTC5h 15m
2026-06-29 CHH769 - Jun 29, 23:39 UTCJun 30, 05:30 UTC5h 51m
2026-06-29 CHH769 - Jun 29, 20:24 UTCJun 29, 20:35 UTC10m
2026-06-29 CHH7607 - Jun 29, 09:05 UTCJun 29, 09:14 UTC10m
2026-06-28 CHH7986 - Jun 28, 23:54 UTCJun 29, 00:14 UTC20m
2026-06-28 CHH7986 - Jun 28, 17:19 UTCJun 28, 21:20 UTC4h 0m
2026-06-28 CHH7985 - Jun 28, 06:59 UTCJun 28, 11:04 UTC4h 5m
2026-06-27 CHH752 - Jun 27, 21:40 UTCJun 27, 21:59 UTC20m
2026-06-27 CHH752 - Jun 27, 12:19 UTCJun 27, 19:00 UTC6h 40m
2026-06-26 CHH751 - Jun 26, 19:04 UTCJun 27, 05:19 UTC10h 15m
2026-06-26 CHH7246 - Jun 26, 15:25 UTCJun 26, 15:45 UTC20m
2026-06-26 CHH7245 - Jun 26, 06:39 UTCJun 26, 06:54 UTC15m
2026-06-25 CHH7009 - Jun 25, 11:50 UTCJun 25, 12:10 UTC20m
2026-06-25 CHH7009 - Jun 25, 10:35 UTCJun 25, 10:45 UTC10m
2026-06-25 CHH7182 - Jun 25, 05:29 UTCJun 25, 08:09 UTC2h 40m
2026-06-25 CHH7966 - Jun 25, 00:19 UTCJun 25, 00:44 UTC25m
2026-06-24 CHH7966 - Jun 24, 21:00 UTCJun 24, 21:44 UTC45m
2026-06-24 CHH7966 - Jun 24, 17:29 UTCJun 24, 17:45 UTC15m
2026-06-24 CHH7965 - Jun 24, 07:05 UTCJun 24, 11:05 UTC4h 0m
2026-06-23 CHH770 - Jun 23, 19:39 UTCJun 23, 19:55 UTC15m

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-1020 page for operator, model, and routing details .

Mode-S 7812A4 frequently asked

What is Mode-S code 7812A4?
7812A4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1020.
Where is Mode-S 7812A4 registered?
Mode-S code 7812A4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7812A4 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 7812A4, octal 36011244, decimal 7,869,092.
What flights does 7812A4 operate?
Mode-S 7812A4 has broadcast 20 distinct callsigns, including CHH754, CHH753, CHH408, CHH407, CHH7985.