sensors Mode-S transponder

781D3C

ICAO 24-bit transponder address · allocated to China

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

Hex
781D3C
Octal
36016474
Decimal
7,871,804
Country
CN
Tail
B-221H
Type
B763
No current signal · last broadcast 1d ago
Flights observed
53
Distinct callsigns
10
Country
CN
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 781D3C.

Country allocation

The ICAO 24-bit address 781D3C 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 10 distinct

Callsign Airline Flights Last seen
HYT9059 - 16 2026-05-21
HYT9060 - 12 2026-05-21
HYT9007 - 7 2026-06-01
HYT9083 - 6 2026-04-30
HYT9087 - 4 2026-04-28
HYT9008 - 3 2026-06-01
HYT9058 - 2 2026-04-18
HYT9088 - 1 2026-04-26
HYT9084 - 1 2026-04-17
HYT9057 - 1 2026-04-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-01 HYT9008 - Jun 1, 08:25 UTCJun 1, 09:10 UTC45m
2026-06-01 HYT9007 - Jun 1, 05:55 UTCJun 1, 06:55 UTC1h 0m
2026-05-31 HYT9007 DAC → DAC May 31, 09:10 UTCJun 1, 06:55 UTC21h 45m
2026-05-29 HYT9008 - May 29, 08:35 UTCMay 29, 09:30 UTC55m
2026-05-29 HYT9007 - May 29, 06:00 UTCMay 29, 07:00 UTC1h 0m
2026-05-28 HYT9007 - May 28, 09:10 UTCMay 29, 07:00 UTC21h 50m
2026-05-28 HYT9007 DAC → DAC May 28, 08:40 UTCMay 29, 07:00 UTC22h 20m
2026-05-28 HYT9007 - May 28, 06:25 UTCMay 28, 07:30 UTC1h 5m
2026-05-23 HYT9008 - May 23, 08:50 UTCMay 23, 09:05 UTC15m
2026-05-23 HYT9007 - May 23, 06:20 UTCMay 23, 07:05 UTC45m
2026-05-21 HYT9060 - May 21, 08:35 UTCMay 21, 09:30 UTC55m
2026-05-21 HYT9059 - May 21, 06:30 UTCMay 21, 07:10 UTC40m
2026-05-16 HYT9060 - May 16, 09:31 UTCMay 16, 10:01 UTC30m
2026-05-16 HYT9059 - May 16, 06:31 UTCMay 16, 07:05 UTC35m
2026-05-14 HYT9060 - May 14, 08:30 UTCMay 14, 09:15 UTC45m
2026-05-14 HYT9059 - May 14, 06:05 UTCMay 14, 07:00 UTC55m
2026-05-12 HYT9060 - May 12, 10:40 UTCMay 12, 11:25 UTC45m
2026-05-12 HYT9059 - May 12, 07:40 UTCMay 12, 08:45 UTC1h 5m
2026-05-11 HYT9059 DAC → DAC May 11, 09:05 UTCMay 12, 08:45 UTC23h 41m
2026-05-11 HYT9059 - May 11, 06:25 UTCMay 11, 07:15 UTC50m
2026-05-09 HYT9060 - May 9, 08:45 UTCMay 9, 09:15 UTC30m
2026-05-09 HYT9059 - May 9, 06:35 UTCMay 9, 07:20 UTC45m
2026-05-07 HYT9060 - May 7, 08:10 UTCMay 7, 08:40 UTC30m
2026-05-07 HYT9059 - May 7, 05:40 UTCMay 7, 06:50 UTC1h 10m
2026-05-04 HYT9060 - May 4, 09:00 UTCMay 4, 09:20 UTC20m
2026-05-04 HYT9059 - May 4, 06:40 UTCMay 4, 07:25 UTC45m
2026-05-02 HYT9060 - May 2, 12:50 UTCMay 2, 13:20 UTC30m
2026-05-02 HYT9059 - May 2, 09:20 UTCMay 2, 10:25 UTC1h 5m
2026-04-30 HYT9060 - Apr 30, 10:50 UTCApr 30, 11:25 UTC35m
2026-04-30 HYT9083 - Apr 30, 08:30 UTCApr 30, 09:15 UTC45m
2026-04-29 HYT9083 - Apr 29, 10:35 UTCApr 30, 09:00 UTC22h 25m
2026-04-28 HYT9087 DAC → DAC Apr 28, 21:10 UTCApr 29, 09:20 UTC12h 11m
2026-04-28 HYT9059 - Apr 28, 07:35 UTCApr 28, 19:30 UTC11h 55m
2026-04-28 HYT9087 - Apr 28, 03:50 UTCApr 28, 04:35 UTC45m
2026-04-27 HYT9087 - Apr 27, 07:55 UTCApr 28, 04:35 UTC20h 40m
2026-04-27 HYT9087 - Apr 27, 05:35 UTCApr 27, 06:35 UTC1h 0m
2026-04-26 HYT9088 - Apr 26, 05:15 UTCApr 26, 05:55 UTC40m
2026-04-26 HYT9059 - Apr 26, 00:50 UTCApr 26, 02:00 UTC1h 10m
2026-04-23 HYT9060 - Apr 23, 09:15 UTCApr 23, 10:05 UTC50m
2026-04-23 HYT9059 - Apr 23, 06:30 UTCApr 23, 07:45 UTC1h 15m
2026-04-21 HYT9060 - Apr 21, 09:10 UTCApr 21, 09:55 UTC45m
2026-04-21 HYT9059 - Apr 21, 06:45 UTCApr 21, 07:25 UTC40m
2026-04-20 HYT9059 - Apr 20, 09:05 UTCApr 21, 07:25 UTC22h 20m
2026-04-20 HYT9060 - Apr 20, 08:50 UTCApr 21, 07:00 UTC22h 11m
2026-04-20 HYT9059 - Apr 20, 06:30 UTCApr 20, 07:15 UTC45m
2026-04-18 HYT9058 - Apr 18, 07:45 UTCApr 18, 08:15 UTC30m
2026-04-18 HYT9083 - Apr 18, 05:25 UTCApr 18, 05:55 UTC30m
2026-04-18 HYT9083 - Apr 18, 05:10 UTCApr 18, 05:20 UTC10m
2026-04-17 HYT9084 - Apr 17, 08:35 UTCApr 17, 09:00 UTC25m
2026-04-17 HYT9057 - Apr 17, 06:20 UTCApr 17, 07:10 UTC50m

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

Mode-S 781D3C frequently asked

What is Mode-S code 781D3C?
781D3C is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-221H.
Where is Mode-S 781D3C registered?
Mode-S code 781D3C is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781D3C broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781D3C, octal 36016474, decimal 7,871,804.
What flights does 781D3C operate?
Mode-S 781D3C has broadcast 10 distinct callsigns, including HYT9059, HYT9060, HYT9007, HYT9083, HYT9087.