Apparatus

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sensors Mode-S transponder

781717

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20CD · BOEING 787-9 Dreamliner

Hex
781717
Octal
36013427
Decimal
7,870,231
Country
CN
Tail
B-20CD
Type
B789
No current signal · last broadcast 58m ago
Flights observed
194
Distinct callsigns
20
Country
CN
Last broadcast
58m ago

Last known position

Most recent position reported by Mode-S 781717.

Country allocation

The ICAO 24-bit address 781717 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
CES737 - 22 2026-07-05
CES740 China Eastern Airlines 21 2026-07-07
CSH871 - 19 2026-07-10
CES739 - 19 2026-07-06
CSH872 - 17 2026-07-10
CSH895 - 15 2026-07-12
CES738 - 15 2026-07-06
CSH898 - 9 2026-07-02
CSH897 - 7 2026-07-02
CSH869 Shanghai Airlines 7 2026-05-23
CSH821 - 7 2026-07-09
CSH885 Shanghai Airlines 6 2026-05-22
CSH870 Shanghai Airlines 6 2026-05-24
CSH891 - 5 2026-07-04
CSH896 - 4 2026-07-13
CSH886 - 4 2026-07-08
CSH892 - 3 2026-07-04
CSH822 - 3 2026-07-01
CSH816 Shanghai Airlines 1 2026-05-12
CSH815 Shanghai Airlines 1 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSH896 - Jul 13, 11:00 UTCJul 14, 01:45 UTC14h 45m
2026-07-12 CSH895 MEL → HND Jul 12, 18:15 UTCJul 13, 09:05 UTC14h 50m
2026-07-12 CES739D - Jul 12, 07:25 UTCJul 12, 16:30 UTC9h 5m
2026-07-10 CSH872 - Jul 10, 21:35 UTCJul 11, 07:25 UTC9h 50m
2026-07-10 CSH872 - Jul 10, 16:30 UTCJul 10, 18:25 UTC1h 55m
2026-07-10 CSH871 - Jul 10, 09:50 UTCJul 10, 11:35 UTC1h 45m
2026-07-10 CSH871 - Jul 10, 04:40 UTCJul 10, 05:50 UTC1h 10m
2026-07-09 CSH871 - Jul 9, 12:30 UTCJul 10, 04:35 UTC16h 5m
2026-07-09 CSH821 - Jul 9, 10:05 UTCJul 9, 11:10 UTC1h 5m
2026-07-08 CSH886 - Jul 8, 08:35 UTCJul 8, 12:25 UTC3h 50m
2026-07-07 CES740 MEL → PVG Jul 7, 11:50 UTCJul 8, 07:05 UTC19h 15m
2026-07-07 CES740 MEL → PVG Jul 7, 11:35 UTCJul 8, 07:05 UTC19h 30m
2026-07-06 CES739 - Jul 6, 08:10 UTCJul 7, 02:30 UTC18h 20m
2026-07-06 CES739 - Jul 6, 05:00 UTCJul 7, 02:30 UTC21h 30m
2026-07-06 CES738 - Jul 6, 01:50 UTCJul 7, 01:45 UTC23h 55m
2026-07-06 CES738 - Jul 6, 01:25 UTCJul 6, 22:50 UTC21h 25m
2026-07-05 CES737 - Jul 5, 13:25 UTCJul 5, 22:30 UTC9h 5m
2026-07-04 CES737 - Jul 4, 22:35 UTCJul 5, 21:45 UTC23h 10m
2026-07-04 CSH892 - Jul 4, 17:10 UTCJul 5, 15:35 UTC22h 25m
2026-07-04 CSH891 - Jul 4, 08:00 UTCJul 4, 14:15 UTC6h 15m
2026-07-02 CSH898 - Jul 2, 18:55 UTCJul 3, 00:45 UTC5h 50m
2026-07-02 CSH897 - Jul 2, 09:35 UTCJul 2, 16:15 UTC6h 40m
2026-07-01 CSH822 - Jul 1, 10:30 UTCJul 2, 09:45 UTC23h 15m
2026-06-30 CES740 MEL → PVG Jun 30, 15:35 UTCJul 1, 09:15 UTC17h 40m
2026-06-30 CES740 MEL → PVG Jun 30, 11:50 UTCJul 1, 09:15 UTC21h 25m
2026-06-29 CES739 KIX → MEL Jun 29, 10:15 UTCJun 30, 02:10 UTC15h 55m
2026-06-28 CES740 MEL → PVG Jun 28, 15:44 UTCJun 29, 09:00 UTC17h 15m
2026-06-28 CES740 MEL → PVG Jun 28, 11:50 UTCJun 29, 09:00 UTC21h 10m
2026-06-27 CES739 - Jun 27, 08:10 UTCJun 28, 02:25 UTC18h 15m
2026-06-27 CES739 DRW → MEL Jun 27, 04:59 UTCJun 28, 02:25 UTC21h 25m
2026-06-27 CES738 - Jun 27, 01:49 UTCJun 27, 23:00 UTC21h 10m
2026-06-27 CES738 - Jun 27, 01:19 UTCJun 27, 23:00 UTC21h 40m
2026-06-26 CES737 - Jun 26, 13:19 UTCJun 26, 22:19 UTC9h 0m
2026-06-26 CES737 - Jun 26, 00:10 UTCJun 26, 22:19 UTC22h 10m
2026-06-25 CSH898 - Jun 25, 19:49 UTCJun 26, 18:54 UTC23h 5m
2026-06-25 CSH898 - Jun 25, 18:55 UTCJun 26, 15:45 UTC20h 50m
2026-06-25 CSH897 - Jun 25, 09:10 UTCJun 25, 15:34 UTC6h 25m
2026-06-24 CSH897 - Jun 24, 09:49 UTCJun 25, 09:45 UTC23h 55m
2026-06-24 CES738 - Jun 24, 01:09 UTCJun 24, 10:45 UTC9h 35m
2026-06-23 CES737 - Jun 23, 13:34 UTCJun 23, 22:25 UTC8h 50m
2026-06-23 CES737 - Jun 23, 00:19 UTCJun 23, 22:25 UTC22h 5m
2026-06-22 CES737 - Jun 22, 21:54 UTCJun 23, 19:10 UTC21h 15m
2026-06-22 CSH898 - Jun 22, 19:49 UTCJun 23, 19:10 UTC23h 20m
2026-06-22 CSH898 - Jun 22, 18:54 UTCJun 23, 15:40 UTC20h 45m
2026-06-22 CSH897 - Jun 22, 09:24 UTCJun 22, 15:59 UTC6h 35m
2026-06-21 CSH822 - Jun 21, 10:04 UTCJun 22, 09:45 UTC23h 40m
2026-06-20 CES740 MEL → PVG Jun 20, 15:29 UTCJun 21, 08:44 UTC17h 15m
2026-06-20 CES740 MEL → PVG Jun 20, 11:44 UTCJun 21, 08:44 UTC21h 0m
2026-06-19 CES739 - Jun 19, 08:54 UTCJun 20, 02:14 UTC17h 20m
2026-06-19 CES739 - Jun 19, 05:49 UTCJun 20, 02:14 UTC20h 25m

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-20CD page for operator, model, and routing details .

Mode-S 781717 frequently asked

What is Mode-S code 781717?
781717 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20CD.
Where is Mode-S 781717 registered?
Mode-S code 781717 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781717 broadcasting right now?
No active broadcast right now. Last signal was 58m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781717, octal 36013427, decimal 7,870,231.
What flights does 781717 operate?
Mode-S 781717 has broadcast 20 distinct callsigns, including CES737, CES740, CSH871, CES739, CSH872.