Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781A4B

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-220F · BOEING 777-200LR

Hex
781A4B
Octal
36015113
Decimal
7,871,051
Country
CN
Tail
B-220F
Type
B77L
No current signal · last broadcast 8h ago
Flights observed
101
Distinct callsigns
20
Country
CN
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S 781A4B.

Country allocation

The ICAO 24-bit address 781A4B 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 2026-05-24
CKK205 China Cargo Airlines 10 2026-05-20
CKK231 China Cargo Airlines 7 2026-05-27
CKK227 China Cargo Airlines 7 2026-05-13
CKK226 China Cargo Airlines 7 2026-05-24
CKK215 China Cargo Airlines 7 2026-05-26
CKK216 China Cargo Airlines 6 2026-05-26
CKK206 China Cargo Airlines 6 2026-05-21
CKK221 China Cargo Airlines 4 2026-05-09
CKK214 China Cargo Airlines 4 2026-05-19
CKK232 China Cargo Airlines 3 2026-05-28
CKK228 China Cargo Airlines 3 2026-05-13
CKK209 China Cargo Airlines 3 2026-05-28
CKK287 China Cargo Airlines 2 2026-04-16
CKK263 China Cargo Airlines 2 2026-05-08
CKK261 China Cargo Airlines 2 2026-05-11
CKK249 - 2 2026-04-27
CKK222 China Cargo Airlines 2 2026-05-09
CKK213 China Cargo Airlines 2 2026-05-19
CKK210 China Cargo Airlines 2 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 CKK210 AMS → PVG May 29, 11:45 UTCMay 29, 18:15 UTC6h 30m
2026-05-28 CKK209 PVG → PVG May 28, 16:00 UTCMay 29, 08:25 UTC16h 25m
2026-05-28 CKK209 PVG → PVG May 28, 06:50 UTCMay 29, 05:05 UTC22h 15m
2026-05-28 CKK232 JFK → PVG May 28, 06:30 UTCMay 29, 03:15 UTC20h 45m
2026-05-28 CKK232 JFK → PVG May 28, 02:55 UTCMay 29, 02:45 UTC23h 50m
2026-05-27 CKK231 PVG → SEA May 27, 18:00 UTCMay 28, 00:20 UTC6h 20m
2026-05-26 CKK231 PVG → SEA May 26, 21:34 UTCMay 27, 16:30 UTC18h 56m
2026-05-26 CKK216 CDG → PVG May 26, 18:50 UTCMay 27, 16:30 UTC21h 41m
2026-05-26 CKK216 CDG → PVG May 26, 18:34 UTCMay 27, 16:30 UTC21h 56m
2026-05-26 CKK215 PVG → CDG May 26, 05:59 UTCMay 26, 15:39 UTC9h 40m
2026-05-25 CKK215 PVG → CDG May 25, 06:50 UTCMay 26, 06:14 UTC23h 24m
2026-05-24 CKK226 LAX → PVG May 24, 17:55 UTCMay 25, 06:50 UTC12h 55m
2026-05-24 CKK225 PVG → LAX May 24, 09:10 UTCMay 24, 14:45 UTC5h 35m
2026-05-23 CKK225 PVG → LAX May 23, 15:15 UTCMay 24, 07:40 UTC16h 26m
2026-05-22 CKK226 LAX → PVG May 22, 18:50 UTCMay 23, 13:10 UTC18h 20m
2026-05-22 CKK226 LAX → PVG May 22, 17:35 UTCMay 23, 13:10 UTC19h 34m
2026-05-22 CKK225 PVG → LAX May 22, 09:20 UTCMay 22, 14:50 UTC5h 30m
2026-05-22 CKK225 PVG → LAX May 22, 00:30 UTCMay 22, 07:30 UTC7h 0m
2026-05-21 CKK206 AMS → PVG May 21, 01:35 UTCMay 22, 00:45 UTC23h 10m
2026-05-20 CKK206 AMS → PVG May 20, 16:50 UTCMay 21, 01:50 UTC9h 0m
2026-05-20 CKK205 PVG → AMS May 20, 04:00 UTCMay 20, 13:30 UTC9h 31m
2026-05-19 CKK205 PVG → AMS May 19, 17:15 UTCMay 20, 13:30 UTC20h 16m
2026-05-19 CKK205 PVG → AMS May 19, 14:50 UTCMay 20, 13:30 UTC22h 41m
2026-05-19 CKK214 CDG → PVG May 19, 12:50 UTCMay 20, 12:45 UTC23h 56m
2026-05-19 CKK214 CDG → PVG May 19, 11:55 UTCMay 20, 10:45 UTC22h 51m
2026-05-19 CKK213 PVG → SZX May 19, 01:45 UTCMay 19, 08:40 UTC6h 55m
2026-05-17 CKK210 AMS → PVG May 17, 15:20 UTCMay 17, 21:15 UTC5h 55m
2026-05-17 CKK209 PVG → PVG May 17, 06:30 UTCMay 17, 13:05 UTC6h 35m
2026-05-13 CKK228 ORD → PVG May 13, 21:00 UTCMay 14, 10:15 UTC13h 15m
2026-05-13 CKK227 PVG → ANC May 13, 12:40 UTCMay 13, 17:50 UTC5h 10m
2026-05-12 CKK227 PVG → ANC May 12, 18:50 UTCMay 13, 11:15 UTC16h 25m
2026-05-11 CKK261 PVG → TPE May 11, 22:00 UTCMay 12, 16:35 UTC18h 35m
2026-05-11 CKK216 CDG → PVG May 11, 18:50 UTCMay 12, 16:35 UTC21h 45m
2026-05-11 CKK216 CDG → PVG May 11, 16:50 UTCMay 12, 16:35 UTC23h 46m
2026-05-11 CKK215 PVG → CDG May 11, 07:00 UTCMay 11, 13:50 UTC6h 50m
2026-05-10 CKK215 PVG → CDG May 10, 11:00 UTCMay 11, 10:45 UTC23h 45m
2026-05-10 CKK215 PVG → CDG May 10, 10:30 UTCMay 11, 07:45 UTC21h 15m
2026-05-09 CKK222 LAX → PVG May 9, 23:15 UTCMay 10, 11:00 UTC11h 45m
2026-05-09 CKK221 PVG → LAX May 9, 10:50 UTCMay 9, 20:40 UTC9h 50m
2026-05-08 CKK264 HKG → PVG May 8, 23:20 UTCMay 8, 23:35 UTC15m
2026-05-08 CKK263 PVG → HKG May 8, 19:00 UTCMay 8, 20:30 UTC1h 30m
2026-05-07 CKK263 PVG → HKG May 7, 21:50 UTCMay 8, 20:30 UTC22h 40m
2026-05-07 CKK206 AMS → PVG May 7, 16:55 UTCMay 7, 22:35 UTC5h 40m
2026-05-07 CKK205 PVG → AMS May 7, 03:55 UTCMay 7, 14:25 UTC10h 30m
2026-05-06 CKK205 PVG → AMS May 6, 07:30 UTCMay 7, 04:15 UTC20h 44m
2026-05-06 CKK274 - May 6, 05:25 UTCMay 7, 04:15 UTC22h 49m
2026-05-05 CKK273 - May 5, 23:25 UTCMay 6, 01:35 UTC2h 10m
2026-05-03 CKK222 LAX → PVG May 3, 21:05 UTCMay 4, 09:20 UTC12h 15m
2026-05-02 CKK221 PVG → LAX May 2, 22:50 UTCMay 3, 18:30 UTC19h 39m
2026-05-02 CKK221 PVG → LAX May 2, 22:15 UTCMay 3, 18:30 UTC20h 14m

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-220F page for operator, model, and routing details .

Mode-S 781A4B frequently asked

What is Mode-S code 781A4B?
781A4B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-220F.
Where is Mode-S 781A4B registered?
Mode-S code 781A4B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781A4B broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781A4B, octal 36015113, decimal 7,871,051.
What flights does 781A4B operate?
Mode-S 781A4B has broadcast 20 distinct callsigns, including CKK225, CKK205, CKK231, CKK227, CKK226.