Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781A1F

ICAO 24-bit transponder address · allocated to China

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

Hex
781A1F
Octal
36015037
Decimal
7,871,007
Country
CN
Tail
B-220E
Type
B77L
No current signal · last broadcast 12h ago
Flights observed
182
Distinct callsigns
20
Country
CN
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 781A1F.

Country allocation

The ICAO 24-bit address 781A1F 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
CKK222 - 20 2026-07-03
CKK221 - 19 2026-07-12
CKK225 - 14 2026-07-11
CKK223 - 14 2026-07-06
CKK231 - 12 2026-07-08
CKK205 - 12 2026-07-02
CKK224 China Cargo Airlines 11 2026-07-07
CKK232 - 9 2026-07-09
CKK226 - 9 2026-07-11
CKK206 China Cargo Airlines 9 2026-07-02
CKK227 China Cargo Airlines 5 2026-06-19
CKK216 - 5 2026-06-15
CKK621 China Cargo Airlines 4 2026-06-05
CKK215 - 4 2026-06-15
CKK214 China Cargo Airlines 3 2026-06-09
CKK622 China Cargo Airlines 2 2026-06-05
CKK288 - 2 2026-07-10
CKK277 China Cargo Airlines 2 2026-05-28
CKK264 China Cargo Airlines 2 2026-06-14
CKK263 China Cargo Airlines 2 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 CKK222A - Jul 13, 07:20 UTCJul 13, 19:05 UTC11h 45m
2026-07-12 CKK221 - Jul 12, 05:50 UTCJul 13, 00:25 UTC18h 35m
2026-07-12 CKK221 - Jul 12, 05:35 UTCJul 13, 00:25 UTC18h 50m
2026-07-11 CKK221 - Jul 11, 23:50 UTCJul 12, 23:45 UTC23h 55m
2026-07-11 CKK226 - Jul 11, 19:50 UTCJul 12, 15:15 UTC19h 25m
2026-07-11 CKK226 - Jul 11, 18:10 UTCJul 12, 15:15 UTC21h 5m
2026-07-11 CKK225 ANC → ORD Jul 11, 08:01 UTCJul 11, 13:35 UTC5h 35m
2026-07-10 CKK225 - Jul 10, 23:15 UTCJul 11, 06:50 UTC7h 35m
2026-07-10 CKK288 - Jul 10, 14:35 UTCJul 10, 14:45 UTC10m
2026-07-10 CKK288 - Jul 10, 08:40 UTCJul 10, 11:50 UTC3h 10m
2026-07-09 CKK287 - Jul 9, 13:50 UTCJul 10, 06:40 UTC16h 50m
2026-07-09 CKK232 - Jul 9, 04:00 UTCJul 10, 03:35 UTC23h 35m
2026-07-09 CKK232 - Jul 9, 00:55 UTCJul 9, 14:35 UTC13h 40m
2026-07-08 CKK231 ANC → JFK Jul 8, 14:45 UTCJul 8, 21:20 UTC6h 35m
2026-07-07 CKK231 - Jul 7, 20:20 UTCJul 8, 13:10 UTC16h 50m
2026-07-07 CKK224 LAX → PVG Jul 7, 10:00 UTCJul 8, 07:05 UTC21h 5m
2026-07-06 CKK223 - Jul 6, 20:20 UTCJul 7, 07:05 UTC10h 45m
2026-07-06 CKK223 - Jul 6, 08:00 UTCJul 7, 07:05 UTC23h 5m
2026-07-06 CKK223 - Jul 6, 07:25 UTCJul 6, 22:00 UTC14h 35m
2026-07-06 CKK223 - Jul 6, 01:15 UTCJul 6, 22:00 UTC20h 45m
2026-07-05 CKK226 - Jul 5, 19:30 UTCJul 6, 08:15 UTC12h 45m
2026-07-05 CKK225 PVG → LAX Jul 5, 11:10 UTCJul 5, 16:25 UTC5h 15m
2026-07-04 CKK225 PVG → LAX Jul 4, 19:40 UTCJul 5, 09:30 UTC13h 50m
2026-07-03 CKK222 - Jul 3, 21:50 UTCJul 4, 16:40 UTC18h 50m
2026-07-03 CKK222 - Jul 3, 21:30 UTCJul 4, 16:40 UTC19h 10m
2026-07-02 CKK221 PVG → LAX Jul 2, 23:50 UTCJul 3, 19:05 UTC19h 15m
2026-07-02 CKK221 PVG → LAX Jul 2, 23:25 UTCJul 3, 19:05 UTC19h 40m
2026-07-02 CKK221 PVG → LAX Jul 2, 19:50 UTCJul 3, 19:05 UTC23h 15m
2026-07-02 CKK206 AMS → PVG Jul 2, 18:15 UTCJul 3, 17:45 UTC23h 30m
2026-07-02 CKK205 - Jul 2, 07:25 UTCJul 2, 14:20 UTC6h 55m
2026-06-30 CKK206 AMS → PVG Jun 30, 18:40 UTCJul 1, 00:35 UTC5h 55m
2026-06-30 CKK205 - Jun 30, 09:30 UTCJun 30, 16:05 UTC6h 35m
2026-06-29 CKK205 - Jun 29, 20:54 UTCJun 30, 16:05 UTC19h 11m
2026-06-29 CKK224 LAX → PVG Jun 29, 13:49 UTCJun 30, 10:10 UTC20h 20m
2026-06-29 CKK224 LAX → PVG Jun 29, 12:45 UTCJun 30, 10:10 UTC21h 25m
2026-06-29 CKK224 LAX → PVG Jun 29, 09:50 UTCJun 30, 09:45 UTC23h 56m
2026-06-29 CKK224 LAX → PVG Jun 29, 09:29 UTCJun 29, 21:39 UTC12h 10m
2026-06-28 CKK223 - Jun 28, 20:50 UTCJun 29, 06:54 UTC10h 5m
2026-06-28 CKK223 - Jun 28, 06:00 UTCJun 29, 05:45 UTC23h 45m
2026-06-28 CKK223 - Jun 28, 05:24 UTCJun 28, 22:15 UTC16h 50m
2026-06-27 CKK223 - Jun 27, 23:50 UTCJun 28, 22:15 UTC22h 25m
2026-06-27 CKK226 - Jun 27, 21:59 UTCJun 28, 21:45 UTC23h 45m
2026-06-27 CKK226 - Jun 27, 17:25 UTCJun 28, 06:10 UTC12h 45m
2026-06-27 CKK225 PVG → LAX Jun 27, 08:55 UTCJun 27, 09:44 UTC50m
2026-06-27 CKK225 PVG → LAX Jun 27, 00:05 UTCJun 27, 07:34 UTC7h 30m
2026-06-25 CKK224 LAX → PVG Jun 25, 09:40 UTCJun 25, 22:14 UTC12h 35m
2026-06-24 CKK223 - Jun 24, 20:44 UTCJun 25, 06:55 UTC10h 10m
2026-06-24 CKK223 - Jun 24, 07:50 UTCJun 25, 06:55 UTC23h 5m
2026-06-24 CKK222 - Jun 24, 07:05 UTCJun 25, 05:44 UTC22h 40m
2026-06-24 CKK222 - Jun 24, 01:49 UTCJun 24, 22:14 UTC20h 25m

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

Mode-S 781A1F frequently asked

What is Mode-S code 781A1F?
781A1F is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-220E.
Where is Mode-S 781A1F registered?
Mode-S code 781A1F is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781A1F broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781A1F, octal 36015037, decimal 7,871,007.
What flights does 781A1F operate?
Mode-S 781A1F has broadcast 20 distinct callsigns, including CKK222, CKK221, CKK225, CKK223, CKK231.