Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781D6D

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-221S · BOEING 777-200LR

Hex
781D6D
Octal
36016555
Decimal
7,871,853
Country
CN
Tail
B-221S
Type
B77L
No current signal · last broadcast 3h ago
Flights observed
116
Distinct callsigns
20
Country
CN
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S 781D6D.

Country allocation

The ICAO 24-bit address 781D6D 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 20 distinct

Callsign Airline Flights Last seen
CKK225 China Cargo Airlines 14 2026-05-21
CKK221 China Cargo Airlines 12 2026-06-06
CKK294 China Cargo Airlines 9 2026-06-07
CKK223 China Cargo Airlines 9 2026-05-28
CKK205 China Cargo Airlines 9 2026-06-02
CKK227 China Cargo Airlines 8 2026-05-31
CKK226 China Cargo Airlines 8 2026-05-21
CKK206 China Cargo Airlines 8 2026-06-03
CKK224 China Cargo Airlines 7 2026-05-29
CKK287 China Cargo Airlines 5 2026-05-27
CKK228 China Cargo Airlines 5 2026-06-01
CKK222 China Cargo Airlines 3 2026-05-27
CKK216 China Cargo Airlines 3 2026-05-25
CKK293 China Cargo Airlines 2 2026-06-06
CKK288 - 2 2026-05-28
CKK232 China Cargo Airlines 2 2026-05-04
CKK231 China Cargo Airlines 2 2026-05-04
CKK215 China Cargo Airlines 2 2026-05-25
CKK213 China Cargo Airlines 2 2026-05-23
CKK264 China Cargo Airlines 1 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-07 CKK294 NLU → LAX Jun 7, 13:20 UTCJun 8, 10:00 UTC20h 40m
2026-06-07 CKK294 NLU → LAX Jun 7, 12:35 UTCJun 8, 10:00 UTC21h 25m
2026-06-07 CKK294 NLU → LAX Jun 7, 09:25 UTCJun 8, 09:15 UTC23h 50m
2026-06-07 CKK294 NLU → LAX Jun 7, 02:50 UTCJun 7, 06:00 UTC3h 10m
2026-06-06 CKK293 LAX → NLU Jun 6, 21:50 UTCJun 6, 23:00 UTC1h 10m
2026-06-06 CKK221 PVG → LAX Jun 6, 08:10 UTCJun 6, 18:14 UTC10h 5m
2026-06-05 CKK221 PVG → LAX Jun 5, 21:20 UTCJun 6, 18:14 UTC20h 55m
2026-06-05 CKK221 PVG → LAX Jun 5, 21:05 UTCJun 6, 18:14 UTC21h 10m
2026-06-05 CKK294 NLU → LAX Jun 5, 15:20 UTCJun 6, 09:30 UTC18h 10m
2026-06-05 CKK294 NLU → LAX Jun 5, 13:45 UTCJun 6, 09:30 UTC19h 45m
2026-06-05 CKK294 NLU → LAX Jun 5, 11:20 UTCJun 6, 09:30 UTC22h 10m
2026-06-05 CKK294 NLU → LAX Jun 5, 10:45 UTCJun 6, 09:15 UTC22h 30m
2026-06-05 CKK294 NLU → LAX Jun 5, 05:50 UTCJun 5, 08:55 UTC3h 5m
2026-06-04 CKK293 LAX → NLU Jun 4, 23:50 UTCJun 5, 01:05 UTC1h 15m
2026-06-04 CKK221 PVG → LAX Jun 4, 10:10 UTCJun 4, 20:15 UTC10h 5m
2026-06-03 CKK221 PVG → LAX Jun 3, 22:20 UTCJun 4, 20:15 UTC21h 55m
2026-06-03 CKK221 PVG → LAX Jun 3, 20:10 UTCJun 4, 19:15 UTC23h 5m
2026-06-03 CKK206 AMS → PVG Jun 3, 17:20 UTCJun 4, 11:25 UTC18h 5m
2026-06-03 CKK206 AMS → PVG Jun 3, 17:00 UTCJun 4, 11:25 UTC18h 25m
2026-06-02 CKK205 PVG → AMS Jun 2, 19:45 UTCJun 3, 13:45 UTC18h 0m
2026-06-01 CKK257 PVG → ICN Jun 1, 23:20 UTCJun 2, 17:35 UTC18h 15m
2026-06-01 CKK264 HKG → PVG Jun 1, 23:05 UTCJun 2, 17:35 UTC18h 30m
2026-06-01 CKK228 ORD → PVG Jun 1, 01:20 UTCJun 1, 20:15 UTC18h 55m
2026-06-01 CKK228 ORD → PVG Jun 1, 00:35 UTCJun 1, 20:15 UTC19h 40m
2026-05-31 CKK227 PVG → ANC May 31, 16:05 UTCMay 31, 21:55 UTC5h 50m
2026-05-30 CKK227 PVG → ANC May 30, 22:10 UTCMay 31, 14:35 UTC16h 25m
2026-05-30 CKK206 AMS → PVG May 30, 17:20 UTCMay 31, 14:35 UTC21h 15m
2026-05-30 CKK206 AMS → PVG May 30, 16:55 UTCMay 31, 14:35 UTC21h 40m
2026-05-29 CKK205 PVG → AMS May 29, 21:50 UTCMay 30, 13:50 UTC16h 0m
2026-05-29 CKK205 PVG → AMS May 29, 15:30 UTCMay 30, 13:50 UTC22h 20m
2026-05-29 CKK205 PVG → AMS May 29, 14:00 UTCMay 30, 13:15 UTC23h 15m
2026-05-29 CKK224 LAX → PVG May 29, 11:20 UTCMay 30, 11:00 UTC23h 40m
2026-05-29 CKK224 LAX → PVG May 29, 10:15 UTCMay 30, 08:05 UTC21h 50m
2026-05-28 CKK223 PVG → LAX May 28, 13:20 UTCMay 29, 07:20 UTC18h 0m
2026-05-28 CKK223 PVG → LAX May 28, 13:00 UTCMay 29, 07:20 UTC18h 20m
2026-05-28 CKK288 - May 28, 10:05 UTCMay 28, 10:25 UTC20m
2026-05-28 CKK288 - May 28, 07:15 UTCMay 28, 07:45 UTC30m
2026-05-27 CKK287 PVG → SIN May 27, 09:20 UTCMay 28, 04:25 UTC19h 5m
2026-05-27 CKK222 LAX → PVG May 27, 07:35 UTCMay 28, 04:25 UTC20h 50m
2026-05-26 CKK222 LAX → PVG May 26, 20:54 UTCMay 27, 09:25 UTC12h 31m
2026-05-26 CKK221 PVG → LAX May 26, 01:10 UTCMay 26, 18:14 UTC17h 5m
2026-05-25 CKK221 PVG → LAX May 25, 21:45 UTCMay 26, 18:14 UTC20h 30m
2026-05-25 CKK221 PVG → LAX May 25, 19:44 UTCMay 26, 18:14 UTC22h 30m
2026-05-25 CKK216 CDG → PVG May 25, 17:20 UTCMay 26, 17:15 UTC23h 54m
2026-05-25 CKK216 CDG → PVG May 25, 16:35 UTCMay 26, 09:35 UTC16h 59m
2026-05-25 CKK215 PVG → CDG May 25, 06:35 UTCMay 25, 13:15 UTC6h 40m
2026-05-23 CKK214 CDG → PVG May 23, 12:10 UTCMay 23, 18:20 UTC6h 11m
2026-05-23 CKK213 PVG → SZX May 23, 01:50 UTCMay 23, 09:05 UTC7h 15m
2026-05-22 CKK213 PVG → SZX May 22, 20:45 UTCMay 22, 20:55 UTC10m
2026-05-21 CKK226 LAX → PVG May 21, 17:05 UTCMay 22, 06:10 UTC13h 5m

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

Mode-S 781D6D frequently asked

What is Mode-S code 781D6D?
781D6D is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-221S.
Where is Mode-S 781D6D registered?
Mode-S code 781D6D is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781D6D broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781D6D, octal 36016555, decimal 7,871,853.
What flights does 781D6D operate?
Mode-S 781D6D has broadcast 20 distinct callsigns, including CKK225, CKK221, CKK294, CKK223, CKK205.