Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 42m ago
Flights observed
80
Distinct callsigns
20
Country
CN
Last broadcast
42m ago

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
CHH770 Hainan Airlines 12 2026-05-12
CHH754 Hainan Airlines 11 2026-05-26
CHH753 Hainan Airlines 11 2026-05-25
CHH769 Hainan Airlines 6 2026-05-11
CHH752 Hainan Airlines 4 2026-05-03
CHH7986 Hainan Airlines 3 2026-05-22
CHH7985 Hainan Airlines 2 2026-04-19
CHH7812 Hainan Airlines 2 2026-05-04
CHH7714 Hainan Airlines 2 2026-05-08
CHH7605 Hainan Airlines 2 2026-05-06
CHH751 Hainan Airlines 2 2026-05-02
CHH7277 Hainan Airlines 2 2026-05-09
CHH408 Hainan Airlines 2 2026-05-29
CHH7966 Hainan Airlines 1 2026-05-21
CHH7965 Hainan Airlines 1 2026-05-20
CHH7815 Hainan Airlines 1 2026-05-01
CHH7813 Hainan Airlines 1 2026-04-27
CHH7811 Hainan Airlines 1 2026-04-26
CHH7808 Hainan Airlines 1 2026-05-30
CHH7807 Hainan Airlines 1 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CHH7808 CAN → PEK May 30, 08:05 UTCMay 30, 08:20 UTC15m
2026-05-29 CHH408 EDI → PEK May 29, 20:20 UTCMay 29, 20:35 UTC15m
2026-05-29 CHH408 EDI → PEK May 29, 11:15 UTCMay 29, 17:50 UTC6h 35m
2026-05-28 CHH407 PEK → EDI May 28, 19:45 UTCMay 28, 20:05 UTC20m
2026-05-28 CHH7335 PEK → CSX May 28, 04:10 UTCMay 28, 04:30 UTC20m
2026-05-26 CHH754 MAN → PEK May 26, 20:24 UTCMay 26, 20:45 UTC20m
2026-05-26 CHH754 MAN → PEK May 26, 11:24 UTCMay 26, 17:50 UTC6h 25m
2026-05-25 CHH753 PEK → MAN May 25, 22:40 UTCMay 26, 05:45 UTC7h 5m
2026-05-25 CHH753 PEK → MAN May 25, 19:15 UTCMay 25, 19:30 UTC15m
2026-05-22 CHH7986 SVO → PEK May 22, 00:10 UTCMay 22, 00:30 UTC20m
2026-05-21 CHH7986 SVO → PEK May 21, 06:50 UTCMay 21, 21:30 UTC14h 40m
2026-05-21 CHH7966 LED → PEK May 21, 00:15 UTCMay 21, 00:30 UTC15m
2026-05-20 CHH7965 PEK → LED May 20, 07:15 UTCMay 20, 21:35 UTC14h 20m
2026-05-19 CHH754 MAN → PEK May 19, 11:20 UTCMay 19, 20:45 UTC9h 25m
2026-05-18 CHH753 PEK → MAN May 18, 19:00 UTCMay 19, 05:25 UTC10h 25m
2026-05-18 CHH7607 PEK → SHA May 18, 09:00 UTCMay 18, 09:10 UTC10m
2026-05-17 CHH7268 CKG → PEK May 17, 15:35 UTCMay 17, 15:55 UTC20m
2026-05-17 CHH7267 PEK → CKG May 17, 09:45 UTCMay 17, 10:10 UTC25m
2026-05-16 CHH754 MAN → PEK May 16, 11:35 UTCMay 16, 18:15 UTC6h 40m
2026-05-15 CHH753 PEK → MAN May 15, 22:25 UTCMay 16, 05:15 UTC6h 50m
2026-05-14 CHH754 MAN → PEK May 14, 11:20 UTCMay 14, 17:50 UTC6h 30m
2026-05-13 CHH753 PEK → MAN May 13, 21:05 UTCMay 14, 05:25 UTC8h 20m
2026-05-12 CHH770 OSL → PEK May 12, 11:45 UTCMay 12, 16:55 UTC5h 10m
2026-05-11 CHH769 PEK → OSL May 11, 21:35 UTCMay 12, 04:50 UTC7h 15m
2026-05-10 CHH754 MAN → PEK May 10, 11:25 UTCMay 10, 17:49 UTC6h 25m
2026-05-09 CHH753 PEK → MAN May 9, 21:09 UTCMay 10, 02:20 UTC5h 10m
2026-05-09 CHH753 PEK → MAN May 9, 19:14 UTCMay 9, 19:25 UTC10m
2026-05-09 CHH7277 PEK → HGH May 9, 00:30 UTCMay 9, 00:40 UTC10m
2026-05-08 CHH7714 SZX → PEK May 8, 14:00 UTCMay 8, 14:10 UTC10m
2026-05-08 CHH7714 SZX → PEK May 8, 11:30 UTCMay 8, 11:40 UTC10m
2026-05-08 CHH7703 PEK → SZX May 8, 01:45 UTCMay 8, 02:04 UTC20m
2026-05-07 CHH754 MAN → PEK May 7, 20:05 UTCMay 7, 20:20 UTC15m
2026-05-07 CHH754 MAN → PEK May 7, 11:25 UTCMay 7, 17:40 UTC6h 15m
2026-05-06 CHH753 PEK → MAN May 6, 19:05 UTCMay 7, 06:00 UTC10h 55m
2026-05-06 CHH7605 PEK → SHA May 6, 07:55 UTCMay 6, 08:10 UTC15m
2026-05-06 CHH7277 PEK → HGH May 6, 00:10 UTCMay 6, 00:25 UTC15m
2026-05-05 CHH770 OSL → PEK May 5, 19:15 UTCMay 5, 19:30 UTC15m
2026-05-05 CHH770 OSL → PEK May 5, 11:50 UTCMay 5, 16:45 UTC4h 55m
2026-05-04 CHH769 PEK → OSL May 4, 19:30 UTCMay 5, 04:55 UTC9h 25m
2026-05-04 CHH7812 CAN → PEK May 4, 12:50 UTCMay 4, 13:00 UTC10m
2026-05-04 CHH7807 PEK → CAN May 4, 04:50 UTCMay 4, 05:05 UTC15m
2026-05-03 CHH752 DUB → PEK May 3, 20:10 UTCMay 3, 20:25 UTC15m
2026-05-03 CHH752 DUB → PEK May 3, 11:30 UTCMay 3, 17:45 UTC6h 15m
2026-05-02 CHH751 PEK → DUB May 2, 19:10 UTCMay 3, 06:20 UTC11h 9m
2026-05-01 CHH7815 PEK → CAN May 1, 12:50 UTCMay 2, 05:10 UTC16h 20m
2026-05-01 CHH7180 SYX → PEK May 1, 10:35 UTCMay 1, 10:50 UTC15m
2026-05-01 CHH7179 PEK → SYX May 1, 01:50 UTCMay 1, 02:15 UTC25m
2026-04-30 CHH7195 PEK → FOC Apr 30, 01:05 UTCApr 30, 01:20 UTC15m
2026-04-29 CHH754 MAN → PEK Apr 29, 20:55 UTCApr 29, 21:15 UTC20m
2026-04-29 CHH754 MAN → PEK Apr 29, 11:35 UTCApr 29, 18:25 UTC6h 50m

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 42m ago.
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 CHH770, CHH754, CHH753, CHH769, CHH752.