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 45m ago
Flights observed
167
Distinct callsigns
13
Country
CN
Last broadcast
45m 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 13 distinct

Callsign Airline Flights Last seen
HYT9103 - 30 2026-07-15
HYT9068 - 28 2026-07-16
HYT9157 - 25 2026-07-16
HYT9104 - 20 2026-07-15
HYT9130 - 16 2026-07-14
HYT9158 - 15 2026-07-17
HYT9067 - 11 2026-07-15
HYT9129 - 10 2026-07-14
HYT9089 YTO Cargo Ltd 3 2026-05-13
HYT9076 - 3 2026-06-30
HYT9075 - 3 2026-07-01
HYT9083 - 2 2026-06-30
HYT9090 YTO Cargo Ltd 1 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 HYT9158 - Jul 17, 06:35 UTCJul 18, 05:45 UTC23h 11m
2026-07-16 HYT9157 - Jul 16, 09:50 UTCJul 17, 05:10 UTC19h 20m
2026-07-16 HYT9157 - Jul 16, 08:50 UTCJul 17, 05:10 UTC20h 20m
2026-07-16 HYT9068 - Jul 16, 06:55 UTCJul 17, 05:10 UTC22h 15m
2026-07-16 HYT9068 - Jul 16, 04:00 UTCJul 17, 03:45 UTC23h 45m
2026-07-16 HYT9068 - Jul 16, 01:20 UTCJul 16, 10:40 UTC9h 20m
2026-07-15 HYT9067 - Jul 15, 09:50 UTCJul 16, 09:45 UTC23h 55m
2026-07-15 HYT9104 - Jul 15, 09:00 UTCJul 16, 07:25 UTC22h 25m
2026-07-15 HYT9104 - Jul 15, 07:30 UTCJul 16, 04:10 UTC20h 40m
2026-07-15 HYT9103 - Jul 15, 05:15 UTCJul 15, 05:40 UTC25m
2026-07-15 HYT9103 - Jul 15, 02:20 UTCJul 15, 04:05 UTC1h 45m
2026-07-14 HYT9103 - Jul 14, 07:50 UTCJul 15, 04:05 UTC20h 14m
2026-07-14 HYT9130 - Jul 14, 07:00 UTCJul 15, 04:05 UTC21h 4m
2026-07-14 HYT9130 - Jul 14, 03:50 UTCJul 15, 03:45 UTC23h 54m
2026-07-14 HYT9129 - Jul 14, 01:55 UTCJul 14, 09:10 UTC7h 15m
2026-07-13 HYT9129 - Jul 13, 09:50 UTCJul 14, 09:10 UTC23h 20m
2026-07-13 HYT9129 - Jul 13, 08:25 UTCJul 14, 07:45 UTC23h 20m
2026-07-13 HYT9158 - Jul 13, 07:15 UTCJul 14, 04:05 UTC20h 50m
2026-07-13 HYT9157 - Jul 13, 02:55 UTCJul 13, 05:55 UTC3h 0m
2026-07-12 HYT9157 - Jul 12, 09:50 UTCJul 13, 05:55 UTC20h 5m
2026-07-12 HYT9157 - Jul 12, 08:25 UTCJul 13, 05:55 UTC21h 30m
2026-07-12 HYT9068 - Jul 12, 06:35 UTCJul 13, 05:45 UTC23h 10m
2026-07-12 HYT9068 - Jul 12, 00:35 UTCJul 12, 10:20 UTC9h 45m
2026-07-11 HYT9068 - Jul 11, 11:50 UTCJul 12, 10:20 UTC22h 30m
2026-07-11 HYT9104 - Jul 11, 09:50 UTCJul 12, 09:45 UTC23h 55m
2026-07-11 HYT9103 - Jul 11, 05:10 UTCJul 11, 05:35 UTC25m
2026-07-11 HYT9103 - Jul 11, 02:15 UTCJul 11, 04:01 UTC1h 45m
2026-07-09 HYT9104 - Jul 9, 09:25 UTCJul 9, 11:25 UTC2h 0m
2026-07-09 HYT9104 - Jul 9, 07:55 UTCJul 9, 08:05 UTC10m
2026-07-09 HYT9103 - Jul 9, 05:55 UTCJul 9, 06:10 UTC15m
2026-07-09 HYT9103 - Jul 9, 03:00 UTCJul 9, 04:40 UTC1h 40m
2026-07-07 HYT9068 - Jul 7, 07:55 UTCJul 8, 02:25 UTC18h 30m
2026-07-07 HYT9103 - Jul 7, 05:05 UTCJul 7, 05:40 UTC35m
2026-07-07 HYT9103 - Jul 7, 02:10 UTCJul 7, 03:55 UTC1h 45m
2026-07-06 HYT9103 - Jul 6, 07:50 UTCJul 7, 03:55 UTC20h 5m
2026-07-06 HYT9103 - Jul 6, 07:20 UTCJul 7, 03:55 UTC20h 35m
2026-07-06 HYT9129 - Jul 6, 01:45 UTCJul 6, 08:45 UTC7h 0m
2026-07-05 HYT9130 - Jul 5, 07:55 UTCJul 6, 07:45 UTC23h 50m
2026-07-05 HYT9129 - Jul 5, 01:50 UTCJul 6, 01:45 UTC23h 55m
2026-07-04 HYT9129 - Jul 4, 11:50 UTCJul 5, 09:40 UTC21h 50m
2026-07-04 HYT9104 - Jul 4, 10:25 UTCJul 5, 09:40 UTC23h 15m
2026-07-04 HYT9104 - Jul 4, 08:50 UTCJul 5, 03:35 UTC18h 45m
2026-07-04 HYT9103 - Jul 4, 05:40 UTCJul 4, 06:05 UTC25m
2026-07-03 HYT9104 - Jul 3, 09:50 UTCJul 4, 04:20 UTC18h 30m
2026-07-03 HYT9104 - Jul 3, 08:10 UTCJul 4, 04:20 UTC20h 10m
2026-07-03 HYT9103 - Jul 3, 05:25 UTCJul 3, 05:40 UTC15m
2026-07-02 HYT9103 - Jul 2, 14:10 UTCJul 3, 04:10 UTC14h 0m
2026-07-01 HYT9075 - Jul 1, 06:05 UTCJul 1, 09:15 UTC3h 10m
2026-06-30 HYT9076 - Jun 30, 08:15 UTCJun 30, 10:30 UTC2h 15m
2026-06-30 HYT9083 - Jun 30, 04:30 UTCJun 30, 05:50 UTC1h 20m

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 45m 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 13 distinct callsigns, including HYT9103, HYT9068, HYT9157, HYT9104, HYT9130.