Apparatus

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sensors Mode-S transponder

781AA6

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-321J · AIRBUS A-350-900

Hex
781AA6
Octal
36015246
Decimal
7,871,142
Country
CN
Tail
B-321J
Type
A359
No current signal · last broadcast 2h ago
Flights observed
94
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781AA6.

Country allocation

The ICAO 24-bit address 781AA6 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
CES709 China Eastern Airlines 9 2026-05-27
CES223 China Eastern Airlines 8 2026-05-22
CES567 China Eastern Airlines 7 2026-04-18
CES217 China Eastern Airlines 7 2026-05-25
CES787 China Eastern Airlines 6 2026-05-17
CES785 China Eastern Airlines 6 2026-05-07
CES710 China Eastern Airlines 6 2026-05-28
CES218 China Eastern Airlines 6 2026-05-25
CES786 China Eastern Airlines 4 2026-05-08
CES735 China Eastern Airlines 4 2026-05-06
CES568 China Eastern Airlines 4 2026-04-18
CES224 China Eastern Airlines 4 2026-05-23
CES788 China Eastern Airlines 3 2026-05-17
CES736 China Eastern Airlines 3 2026-05-06
CES562 China Eastern Airlines 3 2026-05-30
CES751 - 2 2026-04-19
CES7236 China Eastern Airlines 2 2026-05-26
CES7235 China Eastern Airlines 2 2026-05-26
CES524 China Eastern Airlines 2 2026-05-29
CES752 - 1 2026-04-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CES562 SYD → PVG May 30, 01:20 UTCMay 30, 10:00 UTC8h 40m
2026-05-29 CES524 NRT → PVG May 29, 05:45 UTCMay 29, 23:05 UTC17h 20m
2026-05-28 CES710 MAD → PVG May 28, 09:40 UTCMay 29, 03:55 UTC18h 15m
2026-05-27 CES709 PVG → MAD May 27, 18:25 UTCMay 28, 05:20 UTC10h 55m
2026-05-27 CES709 PVG → MAD May 27, 04:30 UTCMay 28, 03:30 UTC23h 0m
2026-05-27 CES709 PVG → MAD May 27, 01:34 UTCMay 28, 01:30 UTC23h 56m
2026-05-26 CES7236 HAN → PVG May 26, 23:35 UTCMay 27, 22:20 UTC22h 45m
2026-05-26 CES7236 HAN → PVG May 26, 21:59 UTCMay 27, 18:40 UTC20h 40m
2026-05-26 CES7235 PVG → HAN May 26, 07:55 UTCMay 26, 18:55 UTC11h 0m
2026-05-25 CES7235 PVG → HAN May 25, 15:50 UTCMay 26, 15:29 UTC23h 40m
2026-05-25 CES218 GVA → PVG May 25, 13:35 UTCMay 26, 11:39 UTC22h 5m
2026-05-25 CES218 GVA → PVG May 25, 11:35 UTCMay 26, 11:30 UTC23h 54m
2026-05-25 CES218 GVA → PVG May 25, 10:15 UTCMay 26, 08:10 UTC21h 54m
2026-05-25 CES217 PVG → GVA May 25, 01:55 UTCMay 25, 05:20 UTC3h 25m
2026-05-23 CES224 CAI → PVG May 23, 12:15 UTCMay 23, 17:50 UTC5h 35m
2026-05-22 CES223 PVG → CAI May 22, 23:10 UTCMay 23, 05:20 UTC6h 9m
2026-05-22 CES223 PVG → CAI May 22, 07:35 UTCMay 23, 05:20 UTC21h 44m
2026-05-22 CES223 PVG → CAI May 22, 07:05 UTCMay 23, 05:20 UTC22h 14m
2026-05-21 CES250 BCN → PVG May 21, 09:45 UTCMay 22, 05:00 UTC19h 15m
2026-05-20 CES249 PVG → BCN May 20, 18:20 UTCMay 21, 05:15 UTC10h 55m
2026-05-19 CES710 MAD → PVG May 19, 09:20 UTCMay 19, 16:50 UTC7h 30m
2026-05-18 CES709 PVG → MAD May 18, 18:20 UTCMay 19, 05:40 UTC11h 19m
2026-05-18 CES709 PVG → MAD May 18, 01:35 UTCMay 19, 01:30 UTC23h 54m
2026-05-18 CES709 PVG → MAD May 18, 01:20 UTCMay 18, 22:00 UTC20h 39m
2026-05-17 CES788 FCO → PVG May 17, 21:35 UTCMay 18, 21:30 UTC23h 54m
2026-05-17 CES788 FCO → PVG May 17, 19:35 UTCMay 18, 18:40 UTC23h 4m
2026-05-17 CES787 PVG → FCO May 17, 09:15 UTCMay 17, 16:40 UTC7h 25m
2026-05-16 CES787 PVG → FCO May 16, 16:05 UTCMay 17, 15:31 UTC23h 25m
2026-05-16 CES787 PVG → FCO May 16, 13:41 UTCMay 17, 13:31 UTC23h 50m
2026-05-16 CES710 MAD → PVG May 16, 11:35 UTCMay 17, 09:50 UTC22h 15m
2026-05-16 CES710 MAD → PVG May 16, 09:35 UTCMay 17, 09:30 UTC23h 55m
2026-05-16 CES710 MAD → PVG May 16, 09:21 UTCMay 16, 16:50 UTC7h 30m
2026-05-15 CES709 PVG → MAD May 15, 09:35 UTCMay 16, 05:20 UTC19h 44m
2026-05-15 CES709 PVG → MAD May 15, 08:20 UTCMay 16, 05:20 UTC20h 59m
2026-05-15 CES562 SYD → PVG May 15, 01:35 UTCMay 16, 01:30 UTC23h 54m
2026-05-15 CES562 SYD → PVG May 15, 01:25 UTCMay 15, 21:50 UTC20h 24m
2026-05-14 CES561 PVG → SYD May 14, 21:45 UTCMay 14, 23:20 UTC1h 35m
2026-05-13 CES524 NRT → PVG May 13, 05:30 UTCMay 13, 06:45 UTC1h 15m
2026-05-12 CES224 CAI → PVG May 12, 12:10 UTCMay 13, 04:00 UTC15h 50m
2026-05-12 CES223 PVG → CAI May 12, 02:45 UTCMay 12, 05:20 UTC2h 35m
2026-05-10 CES710 MAD → PVG May 10, 09:24 UTCMay 10, 16:50 UTC7h 25m
2026-05-09 CES709 PVG → MAD May 9, 18:15 UTCMay 10, 05:45 UTC11h 30m
2026-05-08 CES786 VCE → PVG May 8, 09:59 UTCMay 8, 16:10 UTC6h 10m
2026-05-07 CES785 PVG → VCE May 7, 19:00 UTCMay 8, 05:29 UTC10h 30m
2026-05-07 CES785 PVG → VCE May 7, 05:35 UTCMay 8, 05:29 UTC23h 55m
2026-05-07 CES785 PVG → VCE May 7, 05:25 UTCMay 8, 03:30 UTC22h 5m
2026-05-06 CES736 SYD → PVG May 6, 10:45 UTCMay 7, 03:45 UTC16h 59m
2026-05-06 CES735 PVG → SYD May 6, 00:46 UTCMay 6, 01:40 UTC55m
2026-05-05 CES735 PVG → SYD May 5, 07:10 UTCMay 6, 01:40 UTC18h 30m
2026-05-05 CES735 PVG → SYD May 5, 03:35 UTCMay 6, 01:40 UTC22h 5m

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-321J page for operator, model, and routing details .

Mode-S 781AA6 frequently asked

What is Mode-S code 781AA6?
781AA6 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-321J.
Where is Mode-S 781AA6 registered?
Mode-S code 781AA6 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781AA6 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781AA6, octal 36015246, decimal 7,871,142.
What flights does 781AA6 operate?
Mode-S 781AA6 has broadcast 20 distinct callsigns, including CES709, CES223, CES567, CES217, CES787.