sensors Mode-S transponder

781CDE

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-221F · BOEING 767-300

Hex
781CDE
Octal
36016336
Decimal
7,871,710
Country
CN
Tail
B-221F
Type
B763
No current signal · last broadcast 17h ago
Flights observed
48
Distinct callsigns
7
Country
CN
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 781CDE.

Country allocation

The ICAO 24-bit address 781CDE 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 7 distinct

Callsign Airline Flights Last seen
HYT9087 - 26 2026-05-30
HYT9088 - 13 2026-05-30
HYT9057 - 4 2026-06-02
HYT9058 - 2 2026-06-01
HYT9086 - 1 2026-06-02
HYT9085 - 1 2026-06-01
HYT9084 - 1 2026-04-15

Recent flights last 48

DateFlightRouteTakeoffLandingDuration
2026-06-02 HYT9086 - Jun 2, 12:45 UTCJun 2, 13:00 UTC15m
2026-06-02 HYT9057 - Jun 2, 10:30 UTCJun 2, 11:25 UTC55m
2026-06-01 HYT9058 - Jun 1, 08:40 UTCJun 1, 08:55 UTC15m
2026-06-01 HYT9085 - Jun 1, 04:50 UTCJun 1, 05:40 UTC50m
2026-05-30 HYT9088 - May 30, 07:40 UTCMay 30, 08:35 UTC55m
2026-05-30 HYT9087 - May 30, 04:55 UTCMay 30, 05:55 UTC1h 0m
2026-05-22 HYT9088 - May 22, 08:15 UTCMay 22, 09:15 UTC1h 0m
2026-05-22 HYT9057 - May 22, 06:05 UTCMay 22, 06:50 UTC45m
2026-05-21 HYT9057 - May 21, 09:35 UTCMay 22, 06:50 UTC21h 15m
2026-05-21 HYT9058 DAC → DAC May 21, 08:45 UTCMay 22, 06:50 UTC22h 5m
2026-05-21 HYT9087 - May 21, 07:00 UTCMay 21, 07:25 UTC25m
2026-05-20 HYT9087 - May 20, 09:35 UTCMay 21, 07:25 UTC21h 50m
2026-05-20 HYT9088 DAC → DAC May 20, 09:25 UTCMay 21, 07:25 UTC22h 0m
2026-05-20 HYT9087 - May 20, 05:05 UTCMay 20, 05:50 UTC45m
2026-05-19 HYT9087 - May 19, 07:35 UTCMay 20, 05:50 UTC22h 16m
2026-05-19 HYT9087 - May 19, 05:05 UTCMay 19, 05:50 UTC45m
2026-05-18 HYT9087 DAC → DAC May 18, 08:01 UTCMay 19, 05:50 UTC21h 49m
2026-05-18 HYT9087 - May 18, 05:30 UTCMay 18, 06:10 UTC40m
2026-05-17 HYT9087 - May 17, 08:15 UTCMay 18, 06:10 UTC21h 55m
2026-05-17 HYT9087 - May 17, 05:30 UTCMay 17, 05:55 UTC25m
2026-05-16 HYT9088 - May 16, 11:16 UTCMay 16, 11:46 UTC30m
2026-05-15 HYT9087 - May 15, 15:35 UTCMay 16, 09:45 UTC18h 11m
2026-05-15 HYT9087 - May 15, 14:55 UTCMay 16, 09:45 UTC18h 51m
2026-05-15 HYT9087 - May 15, 12:05 UTCMay 15, 13:00 UTC55m
2026-05-13 HYT9088 - May 13, 07:30 UTCMay 13, 08:10 UTC40m
2026-05-13 HYT9087 - May 13, 05:20 UTCMay 13, 06:00 UTC40m
2026-05-11 HYT9088 - May 11, 09:25 UTCMay 11, 10:00 UTC35m
2026-05-11 HYT9087 - May 11, 06:40 UTCMay 11, 07:35 UTC55m
2026-05-10 HYT9087 - May 10, 12:30 UTCMay 11, 07:35 UTC19h 5m
2026-05-10 HYT9087 - May 10, 09:50 UTCMay 10, 11:10 UTC1h 20m
2026-05-09 HYT9087 - May 9, 14:10 UTCMay 10, 11:10 UTC21h 0m
2026-05-09 HYT9087 - May 9, 11:10 UTCMay 9, 12:15 UTC1h 5m
2026-05-06 HYT9088 - May 6, 08:30 UTCMay 6, 09:15 UTC45m
2026-05-06 HYT9087 - May 6, 06:25 UTCMay 6, 07:05 UTC40m
2026-05-04 HYT9088 - May 4, 08:55 UTCMay 4, 09:25 UTC30m
2026-05-04 HYT9087 - May 4, 06:35 UTCMay 4, 07:20 UTC45m
2026-05-03 HYT9088 DAC → DAC May 3, 08:05 UTCMay 4, 07:20 UTC23h 15m
2026-05-03 HYT9087 - May 3, 05:40 UTCMay 3, 06:35 UTC55m
2026-05-01 HYT9088 - May 1, 12:50 UTCMay 1, 13:20 UTC30m
2026-05-01 HYT9087 - May 1, 10:45 UTCMay 1, 11:35 UTC50m
2026-04-30 HYT9088 - Apr 30, 09:30 UTCApr 30, 10:00 UTC30m
2026-04-30 HYT9087 - Apr 30, 07:05 UTCApr 30, 08:00 UTC55m
2026-04-22 HYT9088 - Apr 22, 08:10 UTCApr 22, 08:50 UTC40m
2026-04-22 HYT9087 - Apr 22, 04:55 UTCApr 22, 06:10 UTC1h 15m
2026-04-20 HYT9088 - Apr 20, 21:30 UTCApr 20, 22:15 UTC45m
2026-04-20 HYT9087 - Apr 20, 18:50 UTCApr 20, 20:00 UTC1h 10m
2026-04-15 HYT9084 - Apr 15, 11:10 UTCApr 15, 11:55 UTC45m
2026-04-15 HYT9057 - Apr 15, 07:01 UTCApr 15, 08:15 UTC1h 15m

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-221F page for operator, model, and routing details .

Mode-S 781CDE frequently asked

What is Mode-S code 781CDE?
781CDE is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-221F.
Where is Mode-S 781CDE registered?
Mode-S code 781CDE is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781CDE broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781CDE, octal 36016336, decimal 7,871,710.
What flights does 781CDE operate?
Mode-S 781CDE has broadcast 7 distinct callsigns, including HYT9087, HYT9088, HYT9057, HYT9058, HYT9086.