Apparatus

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sensors Mode-S transponder

781FDB

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-223U · BOEING 737 MAX 8

Hex
781FDB
Octal
36017733
Decimal
7,872,475
Country
CN
Tail
B-223U
Type
B38M
No current signal · last broadcast 5d ago
Flights observed
54
Distinct callsigns
17
Country
CN
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S 781FDB.

Country allocation

The ICAO 24-bit address 781FDB 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 17 distinct

Callsign Airline Flights Last seen
CDG8078 Shandong Airlines 8 2026-07-26
CDG1151 Shandong Airlines 8 2026-07-22
CDG8077 Shandong Airlines 7 2026-07-26
CDG1152 - 6 2026-07-19
CDG8062 Shandong Airlines 5 2026-07-22
CDG8061 Shandong Airlines 5 2026-07-22
CDG4718 Shandong Airlines 3 2026-05-06
CDG1187 Shandong Airlines 2 2026-07-25
CDG1173 Shandong Airlines 2 2026-07-23
CDG8851 - 1 2026-06-25
CDG4998 - 1 2026-06-20
CDG4997 - 1 2026-06-19
CDG4645 Shandong Airlines 1 2026-06-20
CDG1188 - 1 2026-07-18
CDG1172 Shandong Airlines 1 2026-05-27
CDG1171 - 1 2026-07-01
CDG1169 - 1 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CDG8078 KUL → TNA Jul 26, 20:35 UTCJul 26, 20:50 UTC15m
2026-07-26 CDG8077 TNA → KUL Jul 26, 16:20 UTCJul 26, 19:10 UTC2h 50m
2026-07-25 CDG1187 TNA → SZX Jul 25, 06:20 UTCJul 25, 06:45 UTC25m
2026-07-24 CDG8078 KUL → TNA Jul 24, 23:50 UTCJul 25, 00:20 UTC30m
2026-07-24 CDG8078 KUL → TNA Jul 24, 21:15 UTCJul 24, 21:35 UTC20m
2026-07-24 CDG8077 TNA → KUL Jul 24, 19:25 UTCJul 24, 19:40 UTC15m
2026-07-24 CDG8077 TNA → KUL Jul 24, 16:45 UTCJul 24, 17:10 UTC25m
2026-07-23 CDG1173 TNA → CAN Jul 23, 13:45 UTCJul 23, 13:55 UTC10m
2026-07-22 CDG8062 SIN → TNA Jul 22, 17:20 UTCJul 22, 20:20 UTC3h 0m
2026-07-22 CDG8061 TNA → SIN Jul 22, 12:50 UTCJul 22, 15:45 UTC2h 55m
2026-07-22 CDG1151 TNA → HKG Jul 22, 03:50 UTCJul 22, 04:15 UTC25m
2026-07-19 CDG1152 - Jul 19, 06:05 UTCJul 19, 06:20 UTC15m
2026-07-19 CDG1151 - Jul 19, 03:50 UTCJul 19, 04:30 UTC40m
2026-07-18 CDG1188 - Jul 18, 08:20 UTCJul 18, 08:30 UTC10m
2026-07-18 CDG1187 - Jul 18, 06:55 UTCJul 18, 07:10 UTC15m
2026-07-17 CDG8078 - Jul 17, 22:29 UTCJul 17, 22:55 UTC25m
2026-07-17 CDG8078 - Jul 17, 20:04 UTCJul 17, 20:20 UTC15m
2026-07-17 CDG8077 - Jul 17, 15:55 UTCJul 17, 18:40 UTC2h 45m
2026-07-16 CDG1152 - Jul 16, 06:10 UTCJul 16, 06:25 UTC15m
2026-07-15 CDG1151 - Jul 15, 18:15 UTCJul 16, 04:35 UTC10h 20m
2026-07-15 CDG1152 - Jul 15, 07:10 UTCJul 15, 16:35 UTC9h 25m
2026-07-15 CDG1151 - Jul 15, 03:55 UTCJul 15, 04:45 UTC50m
2026-07-10 CDG1173 - Jul 10, 11:50 UTCJul 10, 12:00 UTC10m
2026-07-10 CDG1169 - Jul 10, 03:15 UTCJul 10, 03:25 UTC10m
2026-07-09 CDG8062 - Jul 9, 17:55 UTCJul 9, 20:50 UTC2h 55m
2026-07-09 CDG8061 - Jul 9, 13:35 UTCJul 9, 16:30 UTC2h 55m
2026-07-09 CDG1152 - Jul 9, 07:05 UTCJul 9, 07:20 UTC15m
2026-07-09 CDG1151 - Jul 9, 04:55 UTCJul 9, 05:35 UTC40m
2026-07-01 CDG1171 - Jul 1, 11:05 UTCJul 1, 11:15 UTC10m
2026-06-25 CDG8851 - Jun 25, 05:35 UTCJun 25, 08:50 UTC3h 15m
2026-06-20 CDG4645 TAO → SGN Jun 20, 14:09 UTCJun 20, 15:29 UTC1h 20m
2026-06-20 CDG4998 - Jun 20, 02:29 UTCJun 20, 02:49 UTC20m
2026-06-19 CDG4997 - Jun 19, 23:54 UTCJun 20, 00:24 UTC30m
2026-06-18 CDG8062 - Jun 18, 17:30 UTCJun 18, 20:35 UTC3h 5m
2026-06-18 CDG8061 - Jun 18, 12:40 UTCJun 18, 15:40 UTC3h 0m
2026-06-16 CDG8062 SIN → TNA Jun 16, 17:24 UTCJun 16, 20:25 UTC3h 1m
2026-06-16 CDG8061 - Jun 16, 05:50 UTCJun 16, 15:30 UTC9h 40m
2026-06-16 CDG1151 - Jun 16, 03:30 UTCJun 16, 04:20 UTC50m
2026-06-12 CDG8078 KUL → TNA Jun 12, 20:15 UTCJun 13, 10:15 UTC13h 59m
2026-06-12 CDG8077 - Jun 12, 18:01 UTCJun 12, 18:10 UTC10m
2026-06-12 CDG8077 - Jun 12, 15:15 UTCJun 12, 15:50 UTC35m
2026-06-09 CDG1152 HKG → TNA Jun 9, 05:55 UTCJun 9, 06:10 UTC15m
2026-06-09 CDG1151 TNA → HKG Jun 9, 03:35 UTCJun 9, 04:15 UTC40m
2026-06-08 CDG1152 HKG → TNA Jun 8, 07:35 UTCJun 8, 07:50 UTC15m
2026-06-08 CDG1151 TNA → HKG Jun 8, 03:45 UTCJun 8, 04:40 UTC55m
2026-06-04 CDG8078 KUL → TNA Jun 4, 23:05 UTCJun 4, 23:15 UTC10m
2026-06-04 CDG8078 KUL → TNA Jun 4, 20:30 UTCJun 4, 20:45 UTC15m
2026-06-04 CDG8077 TNA → KUL Jun 4, 15:30 UTCJun 4, 18:50 UTC3h 20m
2026-05-27 CDG1172 CAN → TNA May 27, 12:55 UTCMay 27, 13:05 UTC10m
2026-05-06 CDG4718 SHE → TAO May 6, 12:01 UTCMay 6, 12:25 UTC25m

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

Mode-S 781FDB frequently asked

What is Mode-S code 781FDB?
781FDB is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-223U.
Where is Mode-S 781FDB registered?
Mode-S code 781FDB is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781FDB broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781FDB, octal 36017733, decimal 7,872,475.
What flights does 781FDB operate?
Mode-S 781FDB has broadcast 17 distinct callsigns, including CDG8078, CDG1151, CDG8077, CDG1152, CDG8062.