Apparatus

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sensors Mode-S transponder

781CDF

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-221A · BOEING 757-200

Hex
781CDF
Octal
36016337
Decimal
7,871,711
Country
CN
Tail
B-221A
Type
B752
No current signal · last broadcast 16h ago
Flights observed
52
Distinct callsigns
12
Country
CN
Last broadcast
16h ago

Last known position

Most recent position reported by Mode-S 781CDF.

Country allocation

The ICAO 24-bit address 781CDF 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 12 distinct

Callsign Airline Flights Last seen
HYT9157 - 12 2026-05-29
HYT9103 YTO Cargo Ltd 9 2026-05-10
HYT9158 YTO Cargo Ltd 8 2026-05-29
HYT9067 YTO Cargo Ltd 6 2026-05-20
HYT9068 - 5 2026-06-02
HYT9104 YTO Cargo Ltd 3 2026-05-04
HYT9089 YTO Cargo Ltd 3 2026-05-13
HYT9130 YTO Cargo Ltd 2 2026-05-24
HYT9129 - 1 2026-05-18
HYT9090 YTO Cargo Ltd 1 2026-05-14
HYT9076 - 1 2026-05-19
HYT9075 - 1 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-02 HYT9068 - Jun 2, 01:15 UTCJun 2, 09:35 UTC8h 20m
2026-05-29 HYT9158 DEL → KMG May 29, 08:35 UTCMay 29, 11:05 UTC2h 30m
2026-05-29 HYT9157 - May 29, 03:10 UTCMay 29, 06:05 UTC2h 55m
2026-05-27 HYT9158 DEL → KMG May 27, 07:20 UTCMay 27, 09:40 UTC2h 20m
2026-05-27 HYT9157 - May 27, 03:14 UTCMay 27, 05:35 UTC2h 20m
2026-05-24 HYT9130 MAA → KMG May 24, 13:05 UTCMay 24, 20:25 UTC7h 20m
2026-05-22 HYT9130 MAA → KMG May 22, 13:20 UTCMay 22, 20:35 UTC7h 15m
2026-05-21 HYT9068 - May 21, 01:30 UTCMay 21, 11:30 UTC10h 0m
2026-05-20 HYT9067 KMG → KHI May 20, 08:05 UTCMay 21, 04:05 UTC20h 0m
2026-05-20 HYT9075 - May 20, 02:50 UTCMay 20, 06:15 UTC3h 26m
2026-05-19 HYT9076 DAC → DAC May 19, 07:50 UTCMay 20, 06:15 UTC22h 26m
2026-05-18 HYT9129 - May 18, 13:25 UTCMay 19, 06:10 UTC16h 44m
2026-05-17 HYT9158 DEL → KMG May 17, 06:55 UTCMay 17, 08:40 UTC1h 45m
2026-05-17 HYT9157 - May 17, 02:45 UTCMay 17, 05:10 UTC2h 25m
2026-05-14 HYT9090 LHE → KMG May 14, 07:10 UTCMay 14, 09:45 UTC2h 35m
2026-05-13 HYT9089 KMG → LHE May 13, 09:50 UTCMay 14, 05:15 UTC19h 25m
2026-05-13 HYT9089 KMG → LHE May 13, 08:05 UTCMay 14, 05:15 UTC21h 10m
2026-05-12 HYT9157 - May 12, 11:50 UTCMay 13, 06:40 UTC18h 50m
2026-05-12 HYT9157 - May 12, 10:45 UTCMay 13, 06:40 UTC19h 55m
2026-05-12 HYT9157 - May 12, 09:05 UTCMay 13, 06:40 UTC21h 35m
2026-05-12 HYT9157 - May 12, 05:50 UTCMay 13, 05:45 UTC23h 55m
2026-05-12 HYT9068 - May 12, 03:50 UTCMay 13, 03:40 UTC23h 50m
2026-05-12 HYT9067 KMG → KHI May 12, 02:45 UTCMay 12, 12:05 UTC9h 20m
2026-05-10 HYT9103 KMG → BOM May 10, 01:20 UTCMay 10, 10:00 UTC8h 40m
2026-05-08 HYT9103 KMG → BOM May 8, 01:35 UTCMay 8, 11:09 UTC9h 35m
2026-05-07 HYT9103 KMG → BOM May 7, 11:50 UTCMay 8, 11:09 UTC23h 20m
2026-05-07 HYT9103 KMG → BOM May 7, 10:45 UTCMay 8, 03:19 UTC16h 35m
2026-05-07 HYT9103 KMG → BOM May 7, 03:50 UTCMay 8, 03:19 UTC23h 30m
2026-05-07 HYT9067 KMG → KHI May 7, 02:55 UTCMay 8, 01:45 UTC22h 50m
2026-05-06 HYT9158 DEL → KMG May 6, 07:50 UTCMay 7, 04:55 UTC21h 4m
2026-05-06 HYT9158 DEL → KMG May 6, 07:25 UTCMay 7, 04:55 UTC21h 29m
2026-05-06 HYT9157 - May 6, 02:50 UTCMay 6, 05:40 UTC2h 50m
2026-05-04 HYT9104 BOM → KMG May 4, 08:50 UTCMay 4, 09:55 UTC1h 5m
2026-05-04 HYT9104 BOM → KMG May 4, 07:25 UTCMay 4, 07:35 UTC10m
2026-05-04 HYT9103 KMG → BOM May 4, 04:39 UTCMay 4, 04:55 UTC15m
2026-05-02 HYT9067 KMG → KHI May 2, 01:10 UTCMay 2, 11:00 UTC9h 50m
2026-05-01 HYT9158 DEL → KMG May 1, 07:50 UTCMay 2, 02:50 UTC19h 0m
2026-05-01 HYT9158 DEL → KMG May 1, 07:20 UTCMay 2, 02:50 UTC19h 30m
2026-04-30 HYT9157 - Apr 30, 12:20 UTCMay 1, 05:40 UTC17h 20m
2026-04-22 HYT9158 DEL → KMG Apr 22, 06:55 UTCApr 22, 09:05 UTC2h 10m
2026-04-22 HYT9157 - Apr 22, 02:10 UTCApr 22, 05:10 UTC3h 0m
2026-04-21 HYT9157 - Apr 21, 07:50 UTCApr 22, 05:10 UTC21h 20m
2026-04-21 HYT9157 - Apr 21, 06:50 UTCApr 22, 05:10 UTC22h 20m
2026-04-21 HYT9089 KMG → LHE Apr 21, 02:00 UTCApr 21, 05:00 UTC3h 0m
2026-04-19 HYT9103 KMG → BOM Apr 19, 01:50 UTCApr 19, 09:40 UTC7h 50m
2026-04-16 HYT9068 - Apr 16, 11:09 UTCApr 16, 11:25 UTC15m
2026-04-16 HYT9068 - Apr 16, 10:05 UTCApr 16, 11:04 UTC1h 0m
2026-04-16 HYT9067 KMG → KHI Apr 16, 03:09 UTCApr 16, 03:55 UTC45m
2026-04-16 HYT9067 KMG → KHI Apr 16, 02:54 UTCApr 16, 03:04 UTC10m
2026-04-15 HYT9104 BOM → KMG Apr 15, 09:25 UTCApr 15, 10:45 UTC1h 21m

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

Mode-S 781CDF frequently asked

What is Mode-S code 781CDF?
781CDF is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-221A.
Where is Mode-S 781CDF registered?
Mode-S code 781CDF is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781CDF broadcasting right now?
No active broadcast right now. Last signal was 16h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781CDF, octal 36016337, decimal 7,871,711.
What flights does 781CDF operate?
Mode-S 781CDF has broadcast 12 distinct callsigns, including HYT9157, HYT9103, HYT9158, HYT9067, HYT9068.