sensors Mode-S transponder

781F4C

ICAO 24-bit transponder address · allocated to China

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

Hex
781F4C
Octal
36017514
Decimal
7,872,332
Country
CN
Tail
B-223N
Type
B77L
No current signal · last broadcast 2h ago
Flights observed
85
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781F4C.

Country allocation

The ICAO 24-bit address 781F4C 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
CSG2531 - 9 2026-05-28
CSG2599 - 5 2026-05-09
CSG2549 - 5 2026-05-07
CSG2537 - 5 2026-05-12
CSG2532 - 5 2026-05-28
CSG2682 - 4 2026-05-08
CSG2534 - 3 2026-04-19
CSG2530 - 3 2026-04-24
CSG2523 - 3 2026-06-02
CSG2516 - 3 2026-04-18
CSG2514 - 3 2026-05-30
CSG2507 - 3 2026-05-31
CSG2505 - 3 2026-05-15
CSG2547 - 2 2026-05-05
CSG2543 - 2 2026-04-22
CSG2535 - 2 2026-04-21
CSG2533 - 2 2026-04-19
CSG2529 - 2 2026-04-23
CSG2524 - 2 2026-06-02
CSG2515 - 2 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-03 CSG2503 - Jun 3, 13:45 UTCJun 3, 15:00 UTC1h 15m
2026-06-02 CSG2524 - Jun 2, 13:05 UTCJun 2, 20:20 UTC7h 15m
2026-06-02 CSG2524 - Jun 2, 12:15 UTCJun 2, 12:30 UTC15m
2026-06-02 CSG2523 - Jun 2, 02:55 UTCJun 2, 09:05 UTC6h 10m
2026-06-01 CSG2523 - Jun 1, 10:30 UTCJun 2, 01:20 UTC14h 50m
2026-06-01 CSG2523 - Jun 1, 04:10 UTCJun 2, 01:20 UTC21h 10m
2026-05-31 CSG2508 - May 31, 23:05 UTCJun 1, 19:00 UTC19h 55m
2026-05-31 CSG2508 - May 31, 22:35 UTCJun 1, 19:00 UTC20h 25m
2026-05-31 CSG2507 - May 31, 14:05 UTCMay 31, 19:50 UTC5h 45m
2026-05-30 CSG2507 - May 30, 17:05 UTCMay 31, 13:00 UTC19h 55m
2026-05-30 CSG2507 - May 30, 16:15 UTCMay 31, 13:00 UTC20h 45m
2026-05-30 CSG2514 - May 30, 13:05 UTCMay 31, 13:00 UTC23h 55m
2026-05-30 CSG2514 - May 30, 12:15 UTCMay 31, 11:00 UTC22h 45m
2026-05-29 CSG2513 - May 29, 23:35 UTCMay 30, 09:10 UTC9h 35m
2026-05-29 CSG2513 - May 29, 09:40 UTCMay 30, 09:00 UTC23h 20m
2026-05-28 CSG2532 - May 28, 16:00 UTCMay 28, 22:35 UTC6h 35m
2026-05-28 CSG2531 - May 28, 07:20 UTCMay 28, 13:35 UTC6h 15m
2026-05-27 CSG2531 - May 27, 17:45 UTCMay 28, 13:35 UTC19h 50m
2026-05-27 CSG2531 - May 27, 15:40 UTCMay 28, 13:35 UTC21h 55m
2026-05-27 CSG2532 - May 27, 13:05 UTCMay 28, 13:00 UTC23h 55m
2026-05-27 CSG2532 - May 27, 12:10 UTCMay 28, 10:20 UTC22h 10m
2026-05-27 CSG2531 - May 27, 02:54 UTCMay 27, 09:45 UTC6h 51m
2026-05-16 CSG2506 - May 16, 07:35 UTCMay 16, 20:30 UTC12h 55m
2026-05-15 CSG2505 - May 15, 21:35 UTCMay 16, 03:20 UTC5h 45m
2026-05-14 CSG2505 - May 14, 21:05 UTCMay 15, 20:00 UTC22h 54m
2026-05-14 CSG2505 - May 14, 20:20 UTCMay 15, 19:00 UTC22h 39m
2026-05-14 CSG2598 - May 14, 09:05 UTCMay 14, 21:40 UTC12h 35m
2026-05-13 CSG2597 - May 13, 23:30 UTCMay 14, 01:40 UTC2h 10m
2026-05-12 CSG2514 - May 12, 18:05 UTCMay 12, 23:25 UTC5h 20m
2026-05-12 CSG2537 - May 12, 10:25 UTCMay 12, 15:35 UTC5h 10m
2026-05-10 CSG2537 - May 10, 18:20 UTCMay 11, 01:30 UTC7h 10m
2026-05-09 CSG2506 - May 9, 16:40 UTCMay 9, 17:45 UTC1h 5m
2026-05-09 CSG2599 ANC → ORD May 9, 08:40 UTCMay 9, 13:55 UTC5h 15m
2026-05-09 CSG2599 - May 9, 00:30 UTCMay 9, 07:05 UTC6h 35m
2026-05-08 CSG2682 - May 8, 01:40 UTCMay 8, 14:25 UTC12h 45m
2026-05-07 CSG2549 - May 7, 17:20 UTCMay 7, 22:40 UTC5h 20m
2026-05-07 CSG2549 - May 7, 08:30 UTCMay 7, 16:00 UTC7h 30m
2026-05-07 CSG2549 - May 7, 06:15 UTCMay 7, 06:25 UTC10m
2026-05-06 - - May 6, 18:20 UTCMay 6, 18:35 UTC15m
2026-05-06 CSG2548 - May 6, 03:20 UTCMay 6, 16:15 UTC12h 55m
2026-05-05 CSG2547 ANC → ORD May 5, 18:40 UTCMay 6, 00:01 UTC5h 20m
2026-05-05 CSG2547 - May 5, 10:35 UTCMay 5, 17:30 UTC6h 55m
2026-05-04 CSG2682 - May 4, 13:55 UTCMay 5, 02:35 UTC12h 41m
2026-05-04 CSG2549 ANC → ORD May 4, 06:40 UTCMay 4, 11:35 UTC4h 55m
2026-05-03 CSG2549 - May 3, 20:55 UTCMay 4, 03:45 UTC6h 50m
2026-05-02 CSG2686 - May 2, 22:40 UTCMay 3, 11:35 UTC12h 54m
2026-05-02 CSG2599 ANC → ORD May 2, 14:50 UTCMay 2, 19:55 UTC5h 5m
2026-05-02 CSG2599 - May 2, 06:25 UTCMay 2, 13:15 UTC6h 50m
2026-05-02 CSG2599 - May 2, 04:15 UTCMay 2, 04:25 UTC10m
2026-05-01 CSG2682 - May 1, 22:05 UTCMay 1, 22:20 UTC15m

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

Mode-S 781F4C frequently asked

What is Mode-S code 781F4C?
781F4C is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-223N.
Where is Mode-S 781F4C registered?
Mode-S code 781F4C is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F4C 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 781F4C, octal 36017514, decimal 7,872,332.
What flights does 781F4C operate?
Mode-S 781F4C has broadcast 20 distinct callsigns, including CSG2531, CSG2599, CSG2549, CSG2537, CSG2532.