Apparatus

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sensors Mode-S transponder

781DF2

ICAO 24-bit transponder address · allocated to China

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

Hex
781DF2
Octal
36016762
Decimal
7,871,986
Country
CN
Tail
B-221T
Type
B752
No current signal · last broadcast 17d ago
Flights observed
133
Distinct callsigns
10
Country
CN
Last broadcast
17d ago

Last known position

Most recent position reported by Mode-S 781DF2.

Country allocation

The ICAO 24-bit address 781DF2 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
HYT9129 - 21 2026-06-29
HYT9103 - 19 2026-06-12
HYT9157 - 18 2026-06-24
HYT9068 - 15 2026-06-11
HYT9130 - 14 2026-06-23
HYT9089 YTO Cargo Ltd 14 2026-05-30
HYT9104 YTO Cargo Ltd 11 2026-06-12
HYT9090 YTO Cargo Ltd 8 2026-05-30
HYT9067 YTO Cargo Ltd 7 2026-06-02
HYT9158 - 6 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-29 HYT9129 - Jun 29, 23:54 UTCJun 30, 07:55 UTC8h 1m
2026-06-29 HYT9129 - Jun 29, 05:20 UTCJun 30, 02:05 UTC20h 46m
2026-06-29 HYT9129 - Jun 29, 00:34 UTCJun 30, 00:30 UTC23h 55m
2026-06-28 HYT9129 - Jun 28, 23:54 UTCJun 29, 07:30 UTC7h 35m
2026-06-28 HYT9129 - Jun 28, 06:34 UTCJun 29, 06:29 UTC23h 55m
2026-06-28 HYT9129 - Jun 28, 05:29 UTCJun 29, 02:05 UTC20h 35m
2026-06-28 HYT9129 - Jun 28, 00:45 UTCJun 29, 00:29 UTC23h 45m
2026-06-26 HYT9129 - Jun 26, 00:20 UTCJun 26, 07:50 UTC7h 30m
2026-06-24 HYT9158 - Jun 24, 06:55 UTCJun 24, 09:15 UTC2h 20m
2026-06-24 HYT9157 - Jun 24, 03:00 UTCJun 24, 05:15 UTC2h 15m
2026-06-23 HYT9157 - Jun 23, 06:34 UTCJun 24, 05:15 UTC22h 40m
2026-06-23 HYT9130 - Jun 23, 00:24 UTCJun 23, 07:25 UTC7h 0m
2026-06-16 HYT9129 - Jun 16, 00:45 UTCJun 16, 07:15 UTC6h 30m
2026-06-15 HYT9129 - Jun 15, 08:35 UTCJun 16, 07:15 UTC22h 40m
2026-06-15 HYT9158 DEL → KMG Jun 15, 06:45 UTCJun 16, 06:30 UTC23h 45m
2026-06-15 HYT9157 - Jun 15, 02:10 UTCJun 15, 04:50 UTC2h 40m
2026-06-14 HYT9157 - Jun 14, 06:35 UTCJun 15, 04:50 UTC22h 14m
2026-06-14 HYT9130 - Jun 14, 06:00 UTCJun 15, 04:30 UTC22h 29m
2026-06-14 HYT9130 - Jun 14, 00:35 UTCJun 14, 07:55 UTC7h 20m
2026-06-12 HYT9104 BOM → KMG Jun 12, 07:45 UTCJun 12, 10:10 UTC2h 25m
2026-06-12 HYT9103 - Jun 12, 05:25 UTCJun 12, 05:45 UTC20m
2026-06-11 HYT9068 - Jun 11, 09:05 UTCJun 12, 03:40 UTC18h 36m
2026-06-11 HYT9068 - Jun 11, 06:50 UTCJun 12, 03:40 UTC20h 51m
2026-06-11 HYT9068 - Jun 11, 01:35 UTCJun 11, 10:05 UTC8h 30m
2026-06-09 HYT9068 - Jun 9, 01:50 UTCJun 9, 09:40 UTC7h 50m
2026-06-08 HYT9068 - Jun 8, 10:35 UTCJun 9, 09:40 UTC23h 5m
2026-06-08 HYT9104 BOM → KMG Jun 8, 09:55 UTCJun 9, 08:30 UTC22h 35m
2026-06-08 HYT9103 KMG → BOM Jun 8, 06:00 UTCJun 8, 06:40 UTC40m
2026-06-07 HYT9104 BOM → KMG Jun 7, 09:30 UTCJun 8, 04:20 UTC18h 50m
2026-06-07 HYT9104 BOM → KMG Jun 7, 07:40 UTCJun 8, 04:20 UTC20h 40m
2026-06-07 HYT9103 KMG → BOM Jun 7, 05:35 UTCJun 7, 05:55 UTC20m
2026-06-07 HYT9103 KMG → BOM Jun 7, 03:10 UTCJun 7, 03:50 UTC40m
2026-06-05 HYT9104 BOM → KMG Jun 5, 07:45 UTCJun 5, 10:35 UTC2h 50m
2026-06-05 HYT9103 KMG → BOM Jun 5, 05:45 UTCJun 5, 06:05 UTC20m
2026-06-04 HYT9130 MAA → KMG Jun 4, 06:35 UTCJun 5, 04:05 UTC21h 30m
2026-06-04 HYT9129 - Jun 4, 00:45 UTCJun 4, 08:15 UTC7h 30m
2026-06-03 HYT9129 - Jun 3, 08:50 UTCJun 4, 08:15 UTC23h 25m
2026-06-03 HYT9068 - Jun 3, 06:45 UTCJun 4, 02:25 UTC19h 40m
2026-06-03 HYT9068 - Jun 3, 04:00 UTCJun 4, 02:25 UTC22h 25m
2026-06-03 HYT9068 - Jun 3, 01:40 UTCJun 3, 09:50 UTC8h 10m
2026-06-02 HYT9067 KMG → KHI Jun 2, 06:35 UTCJun 3, 04:10 UTC21h 35m
2026-06-02 HYT9130 MAA → KMG Jun 2, 05:35 UTCJun 3, 04:10 UTC22h 35m
2026-06-02 HYT9129 - Jun 2, 00:20 UTCJun 2, 07:30 UTC7h 10m
2026-06-01 HYT9129 - Jun 1, 08:35 UTCJun 2, 07:30 UTC22h 55m
2026-06-01 HYT9130 MAA → KMG Jun 1, 06:45 UTCJun 2, 05:50 UTC23h 5m
2026-06-01 HYT9129 - Jun 1, 03:15 UTCJun 2, 02:10 UTC22h 55m
2026-06-01 HYT9130 MAA → KMG Jun 1, 02:00 UTCJun 2, 00:25 UTC22h 25m
2026-05-31 HYT9130 MAA → KMG May 31, 08:45 UTCJun 1, 08:30 UTC23h 45m
2026-05-30 HYT9090 LHE → KMG May 30, 06:40 UTCMay 30, 09:45 UTC3h 5m
2026-05-30 HYT9089 KMG → LHE May 30, 02:06 UTCMay 30, 05:00 UTC2h 54m

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

Mode-S 781DF2 frequently asked

What is Mode-S code 781DF2?
781DF2 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-221T.
Where is Mode-S 781DF2 registered?
Mode-S code 781DF2 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781DF2 broadcasting right now?
No active broadcast right now. Last signal was 17d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781DF2, octal 36016762, decimal 7,871,986.
What flights does 781DF2 operate?
Mode-S 781DF2 has broadcast 10 distinct callsigns, including HYT9129, HYT9103, HYT9157, HYT9068, HYT9130.