Apparatus

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sensors Mode-S transponder

781F00

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-223F · BOEING 777-200LR

Hex
781F00
Octal
36017400
Decimal
7,872,256
Country
CN
Tail
B-223F
Type
B77L
No current signal · last broadcast 2h ago
Flights observed
175
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 781F00.

Country allocation

The ICAO 24-bit address 781F00 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
CKK227 China Cargo Airlines 19 2026-06-17
CKK225 China Cargo Airlines 14 2026-07-07
CKK224 - 12 2026-07-09
CKK602 - 10 2026-05-24
CKK228 China Cargo Airlines 9 2026-06-03
CKK209 China Cargo Airlines 9 2026-06-11
CKK231 China Cargo Airlines 8 2026-06-10
CKK226 - 7 2026-07-07
CKK223 - 7 2026-07-08
CKK601 - 6 2026-05-24
CKK221 - 6 2026-07-10
CKK205 - 6 2026-07-04
CKK210 China Cargo Airlines 5 2026-06-12
CKK605 - 4 2026-07-13
CKK235 - 4 2026-05-17
CKK222A - 4 2026-07-12
CKK203 - 4 2026-04-18
CKK288 - 3 2026-06-13
CKK287 China Cargo Airlines 3 2026-06-07
CKK263 - 3 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CKK605 - Jul 13, 12:20 UTCJul 14, 08:45 UTC20h 25m
2026-07-13 CKK605 - Jul 13, 08:05 UTCJul 14, 08:00 UTC23h 55m
2026-07-13 CKK216A - Jul 13, 07:01 UTCJul 14, 06:00 UTC23h 0m
2026-07-12 CKK215A - Jul 12, 18:25 UTCJul 13, 04:05 UTC9h 40m
2026-07-12 CKK215A - Jul 12, 06:05 UTCJul 13, 04:05 UTC22h 0m
2026-07-12 CKK215A - Jul 12, 05:20 UTCJul 13, 04:00 UTC22h 40m
2026-07-12 CKK222A - Jul 12, 00:05 UTCJul 13, 00:01 UTC23h 55m
2026-07-11 CKK222A - Jul 11, 22:05 UTCJul 12, 22:00 UTC23h 55m
2026-07-11 CKK222A - Jul 11, 20:05 UTCJul 12, 18:45 UTC22h 40m
2026-07-11 CKK222A - Jul 11, 19:10 UTCJul 12, 07:05 UTC11h 55m
2026-07-10 CKK221 - Jul 10, 08:00 UTCJul 10, 19:40 UTC11h 40m
2026-07-09 CKK221 - Jul 9, 22:05 UTCJul 10, 19:40 UTC21h 35m
2026-07-09 CKK221 - Jul 9, 21:40 UTCJul 10, 19:40 UTC22h 0m
2026-07-09 CKK224 - Jul 9, 15:35 UTCJul 10, 09:45 UTC18h 10m
2026-07-09 CKK224 - Jul 9, 12:05 UTCJul 10, 09:45 UTC21h 40m
2026-07-09 CKK224 - Jul 9, 11:15 UTCJul 10, 09:45 UTC22h 30m
2026-07-08 CKK223 - Jul 8, 21:55 UTCJul 9, 08:35 UTC10h 40m
2026-07-08 CKK223 - Jul 8, 05:50 UTCJul 8, 23:40 UTC17h 50m
2026-07-07 CKK226 - Jul 7, 23:30 UTCJul 8, 22:00 UTC22h 30m
2026-07-07 CKK226 - Jul 7, 17:25 UTCJul 8, 06:40 UTC13h 15m
2026-07-07 CKK225 PVG → LAX Jul 7, 09:25 UTCJul 7, 14:55 UTC5h 30m
2026-07-07 CKK225 PVG → LAX Jul 7, 00:25 UTCJul 7, 08:00 UTC7h 35m
2026-07-05 CKK206 AMS → PVG Jul 5, 16:50 UTCJul 5, 22:50 UTC6h 0m
2026-07-04 CKK205 - Jul 4, 20:35 UTCJul 5, 13:50 UTC17h 15m
2026-07-04 CKK205 - Jul 4, 17:25 UTCJul 5, 13:50 UTC20h 25m
2026-07-04 CKK205 - Jul 4, 14:05 UTCJul 5, 13:50 UTC23h 45m
2026-07-04 CKK606 - Jul 4, 11:50 UTCJul 5, 08:05 UTC20h 15m
2026-07-03 CKK605 - Jul 3, 22:50 UTCJul 4, 08:50 UTC10h 0m
2026-07-03 CKK605 - Jul 3, 10:05 UTCJul 4, 08:50 UTC22h 45m
2026-07-03 CKK222 - Jul 3, 00:05 UTCJul 3, 23:00 UTC22h 55m
2026-07-02 CKK222 - Jul 2, 23:55 UTCJul 3, 12:00 UTC12h 5m
2026-07-02 CKK221 PVG → LAX Jul 2, 02:05 UTCJul 2, 20:40 UTC18h 35m
2026-07-02 CKK221 PVG → LAX Jul 2, 01:30 UTCJul 2, 20:40 UTC19h 10m
2026-07-01 CKK221 PVG → LAX Jul 1, 22:05 UTCJul 2, 20:40 UTC22h 35m
2026-07-01 CKK206 AMS → PVG Jul 1, 20:15 UTCJul 2, 20:00 UTC23h 45m
2026-07-01 CKK205 - Jul 1, 10:50 UTCJul 1, 17:35 UTC6h 45m
2026-06-19 CKK264 - Jun 19, 23:09 UTCJun 19, 23:25 UTC15m
2026-06-19 CKK263 - Jun 19, 19:59 UTCJun 19, 20:09 UTC10m
2026-06-19 CKK263 - Jun 19, 18:49 UTCJun 19, 19:29 UTC40m
2026-06-18 CKK228A - Jun 18, 06:05 UTCJun 18, 18:45 UTC12h 40m
2026-06-17 CKK227 PVG → ANC Jun 17, 21:30 UTCJun 18, 03:10 UTC5h 40m
2026-06-17 CKK227 PVG → ANC Jun 17, 12:25 UTCJun 17, 19:45 UTC7h 20m
2026-06-16 CKK264 - Jun 16, 13:09 UTCJun 16, 13:25 UTC15m
2026-06-16 CKK263 - Jun 16, 09:50 UTCJun 16, 10:49 UTC1h 0m
2026-06-14 CKK224 LAX → PVG Jun 14, 10:30 UTCJun 14, 22:50 UTC12h 20m
2026-06-13 CKK223 - Jun 13, 14:00 UTCJun 14, 07:05 UTC17h 5m
2026-06-13 CKK288 - Jun 13, 09:00 UTCJun 13, 11:40 UTC2h 40m
2026-06-12 CKK210 AMS → PVG Jun 12, 12:10 UTCJun 13, 06:20 UTC18h 9m
2026-06-11 CKK209 PVG → PVG Jun 11, 15:25 UTCJun 12, 09:15 UTC17h 51m
2026-06-11 CKK209 PVG → PVG Jun 11, 09:00 UTCJun 12, 08:00 UTC23h 1m

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-223F page for operator, model, and routing details .

Mode-S 781F00 frequently asked

What is Mode-S code 781F00?
781F00 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-223F.
Where is Mode-S 781F00 registered?
Mode-S code 781F00 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F00 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F00, octal 36017400, decimal 7,872,256.
What flights does 781F00 operate?
Mode-S 781F00 has broadcast 20 distinct callsigns, including CKK227, CKK225, CKK224, CKK602, CKK228.