sensors Mode-S transponder

781F03

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-223G · BOEING 777-200LR

Hex
781F03
Octal
36017403
Decimal
7,872,259
Country
CN
Tail
B-223G
Type
B77L
No current signal · last broadcast 2h ago
Flights observed
243
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781F03.

Country allocation

The ICAO 24-bit address 781F03 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
CSG2525 - 17 2026-05-10
CSG2537 - 16 2026-07-13
CSG2526 - 12 2026-05-11
CSG2538 - 10 2026-07-07
CSG2682 - 8 2026-05-30
CSG2599 - 8 2026-05-30
CSG2598 - 8 2026-06-12
CSG2536 - 8 2026-06-27
CSG2522 - 7 2026-06-07
CSG2686 - 6 2026-05-24
CSG2547 - 6 2026-05-28
CSG2540 - 6 2026-06-25
CSG2535 - 6 2026-06-26
CSG2532 - 6 2026-07-11
CSG2510 - 6 2026-07-13
CSG2501 - 6 2026-06-15
CSG2691 - 5 2026-06-28
CSG2521 - 5 2026-06-06
CSG2517 - 5 2026-04-28
CSG2513 - 5 2026-06-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CSG2510 - Jul 13, 12:20 UTCJul 13, 23:55 UTC11h 35m
2026-07-13 CSG2537 - Jul 13, 00:20 UTCJul 13, 05:15 UTC4h 55m
2026-07-12 CSG2537 - Jul 12, 15:35 UTCJul 12, 23:05 UTC7h 30m
2026-07-11 CSG2532 - Jul 11, 18:50 UTCJul 12, 15:45 UTC20h 55m
2026-07-11 CSG2532 - Jul 11, 16:50 UTCJul 12, 15:45 UTC22h 55m
2026-07-11 CSG2532 - Jul 11, 16:15 UTCJul 11, 22:40 UTC6h 25m
2026-07-11 CSG2531 - Jul 11, 06:55 UTCJul 11, 13:25 UTC6h 30m
2026-07-10 CSG2546 - Jul 10, 19:10 UTCJul 10, 19:25 UTC15m
2026-07-10 CSG2546 - Jul 10, 04:20 UTCJul 10, 17:15 UTC12h 55m
2026-07-09 CSG2545 ANC → JFK Jul 9, 18:20 UTCJul 10, 00:50 UTC6h 30m
2026-07-08 CSG2545 - Jul 8, 20:40 UTCJul 9, 14:25 UTC17h 45m
2026-07-08 CSG2696 - Jul 8, 16:50 UTCJul 9, 14:25 UTC21h 35m
2026-07-08 CSG2696 - Jul 8, 15:15 UTCJul 9, 14:25 UTC23h 10m
2026-07-07 CSG2695 - Jul 7, 16:50 UTCJul 8, 11:40 UTC18h 50m
2026-07-07 CSG2538 - Jul 7, 08:50 UTCJul 8, 05:40 UTC20h 50m
2026-07-07 CSG2538 - Jul 7, 06:50 UTCJul 8, 05:40 UTC22h 50m
2026-07-07 CSG2538 - Jul 7, 05:05 UTCJul 7, 17:15 UTC12h 10m
2026-07-06 CSG2537 - Jul 6, 21:15 UTCJul 7, 02:00 UTC4h 45m
2026-07-06 CSG2537 - Jul 6, 12:25 UTCJul 6, 20:05 UTC7h 40m
2026-07-05 CSG2537 - Jul 5, 23:00 UTCJul 6, 20:05 UTC21h 5m
2026-07-05 CSG2546 - Jul 5, 09:55 UTCJul 5, 23:15 UTC13h 20m
2026-07-05 CSG2545 ANC → JFK Jul 5, 00:40 UTCJul 5, 07:00 UTC6h 20m
2026-07-04 CSG2545 - Jul 4, 06:30 UTCJul 4, 23:20 UTC16h 50m
2026-07-03 CSG2538 - Jul 3, 20:50 UTCJul 4, 17:30 UTC20h 40m
2026-07-03 CSG2538 - Jul 3, 20:40 UTCJul 4, 17:30 UTC20h 50m
2026-07-03 CSG2537 - Jul 3, 13:00 UTCJul 3, 17:30 UTC4h 30m
2026-07-03 CSG2537 - Jul 3, 04:40 UTCJul 3, 11:40 UTC7h 0m
2026-07-02 CSG2537 - Jul 2, 15:15 UTCJul 3, 11:40 UTC20h 25m
2026-07-02 CSG2537 - Jul 2, 10:50 UTCJul 3, 10:45 UTC23h 55m
2026-07-02 CSG2698 - Jul 2, 10:00 UTCJul 3, 06:05 UTC20h 5m
2026-07-01 CSG2697 - Jul 1, 23:10 UTCJul 2, 05:45 UTC6h 35m
2026-06-29 CSG2694 - Jun 29, 17:10 UTCJun 29, 23:05 UTC5h 55m
2026-06-29 CSG2693 - Jun 29, 06:34 UTCJun 29, 13:00 UTC6h 25m
2026-06-28 CSG2693 - Jun 28, 15:49 UTCJun 29, 13:00 UTC21h 10m
2026-06-28 CSG2692 - Jun 28, 10:24 UTCJun 29, 06:44 UTC20h 20m
2026-06-28 CSG2691 - Jun 28, 00:09 UTCJun 28, 06:30 UTC6h 20m
2026-06-27 CSG2691 - Jun 27, 08:49 UTCJun 28, 06:30 UTC21h 40m
2026-06-27 CSG2691 - Jun 27, 08:29 UTCJun 28, 06:30 UTC22h 0m
2026-06-27 CSG2536 - Jun 27, 00:50 UTCJun 28, 00:30 UTC23h 40m
2026-06-26 CSG2536 - Jun 26, 21:10 UTCJun 27, 08:49 UTC11h 40m
2026-06-26 CSG2535 - Jun 26, 13:10 UTCJun 26, 17:25 UTC4h 15m
2026-06-25 CSG2535 - Jun 25, 20:19 UTCJun 26, 12:05 UTC15h 45m
2026-06-25 CSG2540 - Jun 25, 12:50 UTCJun 26, 12:05 UTC23h 15m
2026-06-25 CSG2540 - Jun 25, 12:25 UTCJun 26, 10:44 UTC22h 20m
2026-06-25 CSG2540 - Jun 25, 08:50 UTCJun 26, 04:50 UTC20h 0m
2026-06-25 CSG2540 - Jun 25, 08:30 UTCJun 26, 04:50 UTC20h 20m
2026-06-24 CSG2653 - Jun 24, 11:50 UTCJun 25, 05:29 UTC17h 40m
2026-06-24 CSG2653 - Jun 24, 05:40 UTCJun 25, 04:45 UTC23h 5m
2026-06-24 CSG2674 - Jun 24, 00:49 UTCJun 24, 21:00 UTC20h 10m
2026-06-23 CSG2674 - Jun 23, 23:39 UTCJun 24, 21:00 UTC21h 20m

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-223G page for operator, model, and routing details .

Mode-S 781F03 frequently asked

What is Mode-S code 781F03?
781F03 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-223G.
Where is Mode-S 781F03 registered?
Mode-S code 781F03 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F03 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 781F03, octal 36017403, decimal 7,872,259.
What flights does 781F03 operate?
Mode-S 781F03 has broadcast 20 distinct callsigns, including CSG2525, CSG2537, CSG2526, CSG2538, CSG2682.