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 1h ago
Flights observed
124
Distinct callsigns
20
Country
CN
Last broadcast
1h 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
CSG2526 - 12 2026-05-11
CSG2686 - 6 2026-05-24
CSG2682 - 6 2026-05-23
CSG2599 - 6 2026-05-23
CSG2547 - 6 2026-05-28
CSG2536 - 6 2026-04-28
CSG2517 - 5 2026-04-28
CSG2683 - 4 2026-05-29
CSG2549 - 4 2026-05-22
CSG2548 - 4 2026-05-28
CSG2535 - 4 2026-04-28
CSG2518 - 4 2026-04-29
CSG2539 - 3 2026-05-06
CSG2538 - 3 2026-05-04
CSG2522 - 3 2026-05-13
CSG2521 - 3 2026-05-12
CSG2501 - 3 2026-05-14
CSG2692 - 2 2026-04-26
CSG2691 - 2 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CSG2683 ANC → ORD May 29, 17:45 UTCMay 29, 23:50 UTC6h 5m
2026-05-29 CSG2683 - May 29, 09:05 UTCMay 29, 16:40 UTC7h 35m
2026-05-28 CSG2548 - May 28, 23:05 UTCMay 28, 23:20 UTC15m
2026-05-28 CSG2548 - May 28, 08:10 UTCMay 28, 21:00 UTC12h 50m
2026-05-28 CSG2547 - May 28, 00:45 UTCMay 28, 06:00 UTC5h 15m
2026-05-27 CSG2547 - May 27, 15:30 UTCMay 27, 23:15 UTC7h 45m
2026-05-27 CSG2547 - May 27, 13:20 UTCMay 27, 13:30 UTC10m
2026-05-24 CSG2686 - May 24, 14:30 UTCMay 24, 14:45 UTC15m
2026-05-23 CSG2686 - May 23, 23:40 UTCMay 24, 05:50 UTC6h 10m
2026-05-23 CSG2599 - May 23, 15:45 UTCMay 23, 21:15 UTC5h 30m
2026-05-23 CSG2599 - May 23, 13:10 UTCMay 23, 14:30 UTC1h 20m
2026-05-23 CSG2599 - May 23, 04:45 UTCMay 23, 04:55 UTC10m
2026-05-23 CSG2682 - May 23, 00:15 UTCMay 23, 00:30 UTC15m
2026-05-22 CSG2682 - May 22, 09:40 UTCMay 22, 10:45 UTC1h 5m
2026-05-22 CSG2549 ANC → ORD May 22, 02:00 UTCMay 22, 07:15 UTC5h 15m
2026-05-21 CSG2549 - May 21, 17:20 UTCMay 22, 00:20 UTC7h 0m
2026-05-21 CSG2548 - May 21, 00:00 UTCMay 21, 00:25 UTC25m
2026-05-20 CSG2548 - May 20, 09:20 UTCMay 20, 22:00 UTC12h 40m
2026-05-20 CSG2547 ANC → ORD May 20, 02:05 UTCMay 20, 07:25 UTC5h 21m
2026-05-19 CSG2547 - May 19, 17:45 UTCMay 20, 00:40 UTC6h 55m
2026-05-19 CSG2547 - May 19, 15:30 UTCMay 19, 15:40 UTC10m
2026-05-19 CSG2682 - May 19, 11:55 UTCMay 19, 12:05 UTC10m
2026-05-18 CSG2682 - May 18, 20:40 UTCMay 19, 09:30 UTC12h 50m
2026-05-18 CSG2549 - May 18, 11:15 UTCMay 18, 17:25 UTC6h 10m
2026-05-18 CSG2549 - May 18, 02:05 UTCMay 18, 09:20 UTC7h 15m
2026-05-17 CSG2686 - May 17, 18:10 UTCMay 17, 18:20 UTC10m
2026-05-17 CSG2686 - May 17, 03:00 UTCMay 17, 15:50 UTC12h 50m
2026-05-16 CSG2599 ANC → ORD May 16, 19:00 UTCMay 17, 00:30 UTC5h 30m
2026-05-16 CSG2599 - May 16, 16:10 UTCMay 16, 17:25 UTC1h 15m
2026-05-16 CSG2599 - May 16, 07:45 UTCMay 16, 07:55 UTC10m
2026-05-15 CSG2682 - May 15, 19:50 UTCMay 15, 20:05 UTC15m
2026-05-15 CSG2682 - May 15, 04:50 UTCMay 15, 10:45 UTC5h 55m
2026-05-14 CSG2501 ANC → ORD May 14, 20:25 UTCMay 15, 02:10 UTC5h 45m
2026-05-14 CSG2501 - May 14, 11:20 UTCMay 14, 19:10 UTC7h 50m
2026-05-13 CSG2501 - May 13, 22:35 UTCMay 14, 19:10 UTC20h 35m
2026-05-13 CSG2522 - May 13, 14:51 UTCMay 14, 12:50 UTC22h 0m
2026-05-13 CSG2522 - May 13, 12:50 UTCMay 14, 12:45 UTC23h 55m
2026-05-13 CSG2522 - May 13, 09:10 UTCMay 13, 22:45 UTC13h 35m
2026-05-12 CSG2521 - May 12, 22:20 UTCMay 13, 04:45 UTC6h 25m
2026-05-12 CSG2521 - May 12, 12:40 UTCMay 12, 19:55 UTC7h 15m
2026-05-11 CSG2521 - May 11, 17:05 UTCMay 12, 13:55 UTC20h 50m
2026-05-11 CSG2526 - May 11, 14:50 UTCMay 12, 13:55 UTC23h 6m
2026-05-11 CSG2526 - May 11, 12:50 UTCMay 12, 12:45 UTC23h 56m
2026-05-11 CSG2526 - May 11, 10:20 UTCMay 11, 17:25 UTC7h 5m
2026-05-10 CSG2525 - May 10, 23:19 UTCMay 11, 05:15 UTC5h 55m
2026-05-10 CSG2525 - May 10, 14:09 UTCMay 10, 21:04 UTC6h 55m
2026-05-09 CSG2525 - May 9, 21:14 UTCMay 10, 20:45 UTC23h 30m
2026-05-09 CSG2525 - May 9, 14:50 UTCMay 10, 14:45 UTC23h 55m
2026-05-09 CSG2526 - May 9, 08:10 UTCMay 9, 21:14 UTC13h 5m
2026-05-08 CSG2525 - May 8, 20:55 UTCMay 9, 02:50 UTC5h 55m

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 1h 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, CSG2526, CSG2686, CSG2682, CSG2599.