Apparatus

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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 Jul 26, 21:20 UTC
Flights observed
272
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 21:20 UTC

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
CSG2682 - 14 2026-07-24
CSG2599 - 12 2026-07-25
CSG2526 - 12 2026-05-11
CSG2538 - 10 2026-07-07
CSG2510 - 9 2026-07-16
CSG2598 - 8 2026-06-12
CSG2536 - 8 2026-06-27
CSG2686 - 7 2026-07-19
CSG2683 - 7 2026-07-20
CSG2547 - 7 2026-07-22
CSG2522 - 7 2026-06-07
CSG2501 - 7 2026-07-17
CSG2653 - 6 2026-07-13
CSG2549 - 6 2026-07-23
CSG2548 - 6 2026-07-23
CSG2540 - 6 2026-06-25
CSG2535 - 6 2026-06-26
CSG2532 - 6 2026-07-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CSG2506 - Jul 26, 00:05 UTCJul 26, 21:20 UTC21h 16m
2026-07-25 CSG2599 ANC → ORD Jul 25, 15:25 UTCJul 25, 20:40 UTC5h 15m
2026-07-25 CSG2599 - Jul 25, 06:30 UTCJul 25, 14:10 UTC7h 40m
2026-07-24 CSG2682 - Jul 24, 21:45 UTCJul 24, 22:05 UTC20m
2026-07-24 CSG2682 - Jul 24, 07:00 UTCJul 24, 20:05 UTC13h 5m
2026-07-23 CSG2549 - Jul 23, 23:50 UTCJul 24, 04:55 UTC5h 5m
2026-07-23 CSG2549 - Jul 23, 14:55 UTCJul 23, 22:25 UTC7h 30m
2026-07-23 CSG2548 - Jul 23, 08:35 UTCJul 23, 09:00 UTC25m
2026-07-22 CSG2548 - Jul 22, 17:20 UTCJul 23, 06:25 UTC13h 5m
2026-07-22 CSG2547 - Jul 22, 01:15 UTCJul 22, 15:10 UTC13h 55m
2026-07-21 CSG2682 - Jul 21, 18:10 UTCJul 21, 18:45 UTC35m
2026-07-21 CSG2682 - Jul 21, 03:15 UTCJul 21, 16:05 UTC12h 50m
2026-07-20 CSG2683 ANC → ORD Jul 20, 19:15 UTCJul 21, 00:45 UTC5h 30m
2026-07-20 CSG2683 - Jul 20, 09:35 UTCJul 20, 17:10 UTC7h 35m
2026-07-20 CSG2683 - Jul 20, 07:10 UTCJul 20, 07:25 UTC15m
2026-07-19 CSG2686 - Jul 19, 01:20 UTCJul 19, 14:10 UTC12h 50m
2026-07-18 CSG2599 ANC → ORD Jul 18, 17:30 UTCJul 18, 22:40 UTC5h 10m
2026-07-18 CSG2599 - Jul 18, 09:10 UTCJul 18, 16:20 UTC7h 10m
2026-07-18 CSG2682 - Jul 18, 02:45 UTCJul 18, 03:00 UTC16m
2026-07-17 CSG2682 - Jul 17, 11:30 UTCJul 18, 00:39 UTC13h 10m
2026-07-17 CSG2501 - Jul 17, 04:14 UTCJul 17, 09:20 UTC5h 5m
2026-07-16 CSG2510 - Jul 16, 12:44 UTCJul 17, 02:59 UTC14h 15m
2026-07-16 CSG2510 - Jul 16, 03:15 UTCJul 17, 02:45 UTC23h 30m
2026-07-15 CSG2509 - Jul 15, 06:50 UTCJul 16, 00:50 UTC18h 0m
2026-07-15 CSG2509 - Jul 15, 05:10 UTCJul 16, 00:50 UTC19h 40m
2026-07-14 CSG2654 - Jul 14, 19:20 UTCJul 15, 15:20 UTC19h 59m
2026-07-13 CSG2653 - Jul 13, 22:50 UTCJul 14, 16:50 UTC18h 0m
2026-07-13 CSG2653 - Jul 13, 22:00 UTCJul 14, 16:50 UTC18h 50m
2026-07-13 CSG2510 - Jul 13, 12:50 UTCJul 14, 07:20 UTC18h 30m
2026-07-13 CSG2510 - Jul 13, 12:20 UTCJul 14, 07:20 UTC19h 0m
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

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 Jul 26, 21:20 UTC.
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, CSG2682, CSG2599, CSG2526.