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sensors Mode-S transponder

7812A3

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1021 · AIRBUS A-330-300

Hex
7812A3
Octal
36011243
Decimal
7,869,091
Country
CN
Tail
B-1021
Type
A333
No current signal · last broadcast Jul 26, 08:55 UTC
Flights observed
182
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 08:55 UTC

Last known position

Most recent position reported by Mode-S 7812A3.

Country allocation

The ICAO 24-bit address 7812A3 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 21 2026-07-10
CHH770 Hainan Airlines 19 2026-07-18
CHH753 - 17 2026-07-09
CHH769 - 14 2026-07-17
CHH752 - 13 2026-07-14
CHH7986 - 11 2026-07-02
CHH751 - 8 2026-07-13
CHH7985 - 7 2026-07-02
CHH7603 - 5 2026-07-13
CHH7277 - 5 2026-07-17
CHH7966 - 4 2026-06-29
CHH7801 - 4 2026-06-26
CHH7965 - 3 2026-06-28
CHH7703 Hainan Airlines 3 2026-07-19
CHH765 Hainan Airlines 3 2026-07-25
CHH7605 Hainan Airlines 3 2026-06-04
CHH7848 - 2 2026-07-13
CHH7847 - 2 2026-07-15
CHH7813 - 2 2026-06-26
CHH7812 Hainan Airlines 2 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CHH720 HKG → HAK Jul 26, 08:45 UTCJul 26, 08:55 UTC10m
2026-07-26 CHH719 HAK → HKG Jul 26, 06:40 UTCJul 26, 06:55 UTC15m
2026-07-25 CHH765 HAK → SVO Jul 25, 00:20 UTCJul 25, 00:50 UTC30m
2026-07-24 CHH7182 PEK → HAK Jul 24, 06:05 UTCJul 25, 00:50 UTC18h 45m
2026-07-21 CHH765 HAK → SVO Jul 21, 19:25 UTCJul 22, 03:15 UTC7h 50m
2026-07-20 CHH765 - Jul 20, 00:45 UTCJul 20, 12:25 UTC11h 40m
2026-07-19 CHH7024 - Jul 19, 07:25 UTCJul 19, 07:35 UTC10m
2026-07-19 CHH7703 PEK → SZX Jul 19, 05:45 UTCJul 19, 05:55 UTC10m
2026-07-19 CHH7703 PEK → SZX Jul 19, 03:00 UTCJul 19, 03:10 UTC10m
2026-07-18 CHH770 OSL → PEK Jul 18, 11:45 UTCJul 18, 19:50 UTC8h 5m
2026-07-17 CHH769 - Jul 17, 22:55 UTCJul 18, 04:35 UTC5h 41m
2026-07-17 CHH769 - Jul 17, 19:40 UTCJul 17, 19:49 UTC10m
2026-07-17 CHH7277 - Jul 17, 01:00 UTCJul 17, 01:09 UTC10m
2026-07-16 CHH770 - Jul 16, 19:25 UTCJul 16, 19:45 UTC20m
2026-07-16 CHH770 - Jul 16, 11:40 UTCJul 16, 16:55 UTC5h 15m
2026-07-15 CHH769 - Jul 15, 23:00 UTCJul 16, 04:35 UTC5h 35m
2026-07-15 CHH769 - Jul 15, 19:40 UTCJul 15, 19:50 UTC10m
2026-07-15 CHH7847 - Jul 15, 08:45 UTCJul 15, 09:00 UTC15m
2026-07-15 CHH7606 - Jul 15, 06:45 UTCJul 15, 07:00 UTC15m
2026-07-14 CHH752 - Jul 14, 20:45 UTCJul 14, 21:00 UTC15m
2026-07-14 CHH752 - Jul 14, 11:20 UTCJul 14, 18:20 UTC7h 0m
2026-07-13 CHH751 - Jul 13, 19:15 UTCJul 14, 05:40 UTC10h 25m
2026-07-13 CHH7848 - Jul 13, 08:30 UTCJul 13, 14:55 UTC6h 25m
2026-07-13 CHH7603 - Jul 13, 01:05 UTCJul 13, 01:20 UTC15m
2026-07-12 CHH752 - Jul 12, 20:35 UTCJul 12, 20:50 UTC15m
2026-07-12 CHH752 - Jul 12, 11:10 UTCJul 12, 18:10 UTC7h 0m
2026-07-11 CHH751 - Jul 11, 19:50 UTCJul 11, 20:10 UTC20m
2026-07-11 CHH7603 - Jul 11, 01:05 UTCJul 11, 01:15 UTC10m
2026-07-10 CHH754 MAN → PEK Jul 10, 20:55 UTCJul 10, 21:20 UTC25m
2026-07-10 CHH754 MAN → PEK Jul 10, 11:55 UTCJul 10, 18:25 UTC6h 30m
2026-07-09 CHH753 - Jul 9, 19:55 UTCJul 10, 06:05 UTC10h 10m
2026-07-08 CHH7189 - Jul 8, 01:00 UTCJul 8, 01:20 UTC20m
2026-07-07 CHH7267 - Jul 7, 13:35 UTCJul 7, 13:55 UTC20m
2026-07-06 CHH7577 - Jul 6, 23:20 UTCJul 6, 23:30 UTC10m
2026-07-06 CHH752 - Jul 6, 20:30 UTCJul 6, 20:50 UTC20m
2026-07-06 CHH752 - Jul 6, 11:10 UTCJul 6, 18:05 UTC6h 55m
2026-07-05 CHH751 - Jul 5, 19:30 UTCJul 6, 05:45 UTC10h 15m
2026-07-04 CHH752 DUB → ABA Jul 4, 11:15 UTCJul 4, 17:50 UTC6h 35m
2026-07-03 CHH751 - Jul 3, 19:30 UTCJul 4, 05:55 UTC10h 25m
2026-07-03 CHH7848 - Jul 3, 14:15 UTCJul 3, 14:40 UTC25m
2026-07-03 CHH7847 - Jul 3, 08:20 UTCJul 3, 08:40 UTC20m
2026-07-02 CHH7986 - Jul 2, 23:55 UTCJul 3, 00:15 UTC20m
2026-07-02 CHH7985 - Jul 2, 10:05 UTCJul 2, 21:30 UTC11h 25m
2026-07-01 CHH7986 - Jul 1, 23:55 UTCJul 2, 00:15 UTC20m
2026-07-01 CHH7986 - Jul 1, 17:30 UTCJul 1, 21:25 UTC3h 55m
2026-07-01 CHH7985 - Jul 1, 06:35 UTCJul 1, 10:55 UTC4h 20m
2026-07-01 CHH7986 - Jul 1, 00:10 UTCJul 1, 00:35 UTC25m
2026-06-30 CHH7985 - Jun 30, 06:45 UTCJun 30, 21:40 UTC14h 55m
2026-06-30 CHH7986 - Jun 30, 00:14 UTCJun 30, 00:35 UTC20m
2026-06-29 CHH7986 - Jun 29, 20:54 UTCJun 29, 21:34 UTC40m

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-1021 page for operator, model, and routing details .

Mode-S 7812A3 frequently asked

What is Mode-S code 7812A3?
7812A3 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1021.
Where is Mode-S 7812A3 registered?
Mode-S code 7812A3 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 7812A3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 08:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 7812A3, octal 36011243, decimal 7,869,091.
What flights does 7812A3 operate?
Mode-S 7812A3 has broadcast 20 distinct callsigns, including CHH754, CHH770, CHH753, CHH769, CHH752.