Apparatus

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sensors Mode-S transponder

781581

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-304D · AIRBUS A-350-900

Hex
781581
Octal
36012601
Decimal
7,869,825
Country
CN
Tail
B-304D
Type
A359
Broadcasting now · callsign CES261 · 25,750 ft
Flights observed
100
Distinct callsigns
18
Country
CN
Last broadcast
45m ago

Current position

781581 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 781581 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 18 distinct

Callsign Airline Flights Last seen
CES249 China Eastern Airlines 19 2026-05-25
CES250 China Eastern Airlines 15 2026-05-26
CES736 China Eastern Airlines 7 2026-05-03
CES788 China Eastern Airlines 6 2026-05-21
CES735 China Eastern Airlines 6 2026-05-03
CES561 China Eastern Airlines 6 2026-05-22
CES787 China Eastern Airlines 5 2026-05-21
CES562 China Eastern Airlines 5 2026-05-23
CES223 China Eastern Airlines 5 2026-05-05
CES7235 China Eastern Airlines 4 2026-05-28
CES709 China Eastern Airlines 4 2026-05-14
CES524 China Eastern Airlines 4 2026-05-27
CES224 China Eastern Airlines 4 2026-05-05
CES710 China Eastern Airlines 3 2026-05-15
CES541 China Eastern Airlines 3 2026-05-13
CES7236 China Eastern Airlines 2 2026-05-28
CES542 China Eastern Airlines 1 2026-04-18
CES261 - 1 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CES261 - May 30, 06:15 UTCMay 30, 16:15 UTC10h 0m
2026-05-28 CES7236 HAN → PVG May 28, 22:15 UTCMay 29, 06:05 UTC7h 50m
2026-05-28 CES7235 PVG → HAN May 28, 07:55 UTCMay 28, 18:35 UTC10h 40m
2026-05-27 CES524 NRT → PVG May 27, 05:14 UTCMay 27, 06:34 UTC1h 20m
2026-05-26 CES250 BCN → PVG May 26, 09:40 UTCMay 27, 03:39 UTC18h 0m
2026-05-25 CES249 PVG → BCN May 25, 18:30 UTCMay 26, 05:10 UTC10h 40m
2026-05-25 CES249 PVG → BCN May 25, 09:10 UTCMay 26, 05:10 UTC20h 0m
2026-05-25 CES249 PVG → BCN May 25, 07:10 UTCMay 26, 05:10 UTC21h 59m
2026-05-24 CES250 BCN → PVG May 24, 10:20 UTCMay 25, 05:00 UTC18h 40m
2026-05-24 CES250 BCN → PVG May 24, 09:20 UTCMay 25, 05:00 UTC19h 40m
2026-05-23 CES249 PVG → BCN May 23, 21:45 UTCMay 24, 05:15 UTC7h 30m
2026-05-23 CES249 PVG → BCN May 23, 08:20 UTCMay 24, 05:15 UTC20h 56m
2026-05-23 CES562 SYD → PVG May 23, 01:15 UTCMay 23, 22:20 UTC21h 5m
2026-05-22 CES561 PVG → SYD May 22, 21:55 UTCMay 22, 22:50 UTC55m
2026-05-22 CES561 PVG → SYD May 22, 01:30 UTCMay 22, 22:50 UTC21h 20m
2026-05-21 CES788 FCO → PVG May 21, 22:20 UTCMay 22, 22:15 UTC23h 55m
2026-05-21 CES788 FCO → PVG May 21, 19:25 UTCMay 22, 02:10 UTC6h 45m
2026-05-21 CES787 PVG → FCO May 21, 06:10 UTCMay 21, 16:15 UTC10h 5m
2026-05-16 CES7236 HAN → PVG May 16, 22:30 UTCMay 17, 05:50 UTC7h 20m
2026-05-16 CES7235 PVG → HAN May 16, 10:46 UTCMay 16, 18:25 UTC7h 40m
2026-05-15 CES7235 PVG → HAN May 15, 16:20 UTCMay 16, 16:15 UTC23h 56m
2026-05-15 CES7235 PVG → HAN May 15, 14:20 UTCMay 16, 14:16 UTC23h 55m
2026-05-15 CES710 MAD → PVG May 15, 12:20 UTCMay 16, 11:21 UTC23h 0m
2026-05-15 CES710 MAD → PVG May 15, 09:35 UTCMay 15, 17:05 UTC7h 29m
2026-05-14 CES709 PVG → MAD May 14, 10:35 UTCMay 15, 05:45 UTC19h 10m
2026-05-14 CES709 PVG → MAD May 14, 08:25 UTCMay 15, 05:45 UTC21h 20m
2026-05-14 CES562 SYD → PVG May 14, 01:15 UTCMay 15, 00:00 UTC22h 45m
2026-05-13 CES561 PVG → SYD May 13, 07:10 UTCMay 13, 22:40 UTC15h 30m
2026-05-13 CES541 PVG → BKK May 13, 03:00 UTCMay 13, 05:25 UTC2h 25m
2026-05-11 CES710 MAD → PVG May 11, 09:30 UTCMay 11, 16:40 UTC7h 10m
2026-05-10 CES709 PVG → MAD May 10, 20:20 UTCMay 11, 06:00 UTC9h 40m
2026-05-10 CES709 PVG → MAD May 10, 01:14 UTCMay 11, 00:15 UTC23h 0m
2026-05-09 CES788 FCO → PVG May 9, 22:20 UTCMay 10, 22:15 UTC23h 55m
2026-05-09 CES788 FCO → PVG May 9, 19:25 UTCMay 10, 02:00 UTC6h 35m
2026-05-09 CES787 PVG → FCO May 9, 06:15 UTCMay 9, 16:40 UTC10h 25m
2026-05-08 CES787 PVG → FCO May 8, 15:25 UTCMay 9, 14:15 UTC22h 50m
2026-05-08 CES250 BCN → PVG May 8, 12:20 UTCMay 9, 10:15 UTC21h 55m
2026-05-08 CES250 BCN → PVG May 8, 10:19 UTCMay 9, 10:15 UTC23h 55m
2026-05-08 CES250 BCN → PVG May 8, 09:19 UTCMay 9, 06:35 UTC21h 15m
2026-05-07 CES249 PVG → BCN May 7, 10:20 UTCMay 8, 05:35 UTC19h 14m
2026-05-07 CES249 PVG → BCN May 7, 08:50 UTCMay 8, 05:35 UTC20h 45m
2026-05-07 CES249 PVG → BCN May 7, 02:20 UTCMay 8, 02:14 UTC23h 55m
2026-05-07 CES562 SYD → PVG May 7, 01:40 UTCMay 7, 22:15 UTC20h 35m
2026-05-06 CES524 NRT → PVG May 6, 05:20 UTCMay 6, 22:30 UTC17h 10m
2026-05-05 CES224 CAI → PVG May 5, 12:10 UTCMay 6, 03:40 UTC15h 30m
2026-05-05 CES223 PVG → CAI May 5, 02:25 UTCMay 5, 05:20 UTC2h 55m
2026-05-04 CES223 PVG → CAI May 4, 08:25 UTCMay 5, 05:20 UTC20h 56m
2026-05-03 CES736 SYD → PVG May 3, 17:54 UTCMay 4, 06:25 UTC12h 30m
2026-05-03 CES736 SYD → PVG May 3, 10:45 UTCMay 4, 06:25 UTC19h 40m
2026-05-03 CES735 PVG → SYD May 3, 01:10 UTCMay 3, 02:10 UTC1h 0m

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

Mode-S 781581 frequently asked

What is Mode-S code 781581?
781581 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-304D.
Where is Mode-S 781581 registered?
Mode-S code 781581 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781581 broadcasting right now?
Yes. Mode-S 781581 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781581, octal 36012601, decimal 7,869,825.
What flights does 781581 operate?
Mode-S 781581 has broadcast 18 distinct callsigns, including CES249, CES250, CES736, CES788, CES735.