Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

781E2A

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-222H · BOEING 777-200LR

Hex
781E2A
Octal
36017052
Decimal
7,872,042
Country
CN
Tail
B-222H
Type
B77L
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
229
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S 781E2A.

Country allocation

The ICAO 24-bit address 781E2A 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 29 2026-07-24
CKK227 China Cargo Airlines 18 2026-06-28
CKK602 - 14 2026-05-09
CKK235 - 12 2026-05-09
CKK222 - 12 2026-06-25
CKK601 - 11 2026-05-09
CKK228 - 10 2026-06-29
CKK226 China Cargo Airlines 9 2026-07-24
CKK221 China Cargo Airlines 8 2026-06-24
CKK205 China Cargo Airlines 8 2026-07-25
CKK625 China Cargo Airlines 7 2026-07-20
CKK206 China Cargo Airlines 7 2026-07-26
CKK626 China Cargo Airlines 6 2026-07-21
CKK236 China Cargo Airlines 6 2026-05-10
CKK224 China Cargo Airlines 6 2026-07-02
CKK223 - 6 2026-07-01
CKK216 - 6 2026-06-12
CKK257 China Cargo Airlines 5 2026-07-25
CKK606 - 4 2026-07-16
CKK228A - 4 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CKK206 AMS → PVG Jul 26, 17:25 UTCJul 26, 22:30 UTC5h 5m
2026-07-25 CKK205 PVG → AMS Jul 25, 19:50 UTCJul 26, 14:30 UTC18h 41m
2026-07-25 CKK257 PVG → ICN Jul 25, 03:30 UTCJul 25, 17:40 UTC14h 10m
2026-07-24 CKK226 LAX → PVG Jul 24, 15:20 UTCJul 25, 04:00 UTC12h 40m
2026-07-24 CKK225 PVG → LAX Jul 24, 07:20 UTCJul 24, 12:25 UTC5h 5m
2026-07-23 CKK225 PVG → LAX Jul 23, 23:00 UTCJul 24, 06:10 UTC7h 10m
2026-07-23 CKK225 PVG → LAX Jul 23, 08:50 UTCJul 24, 06:10 UTC21h 20m
2026-07-22 CKK210 AMS → PVG Jul 22, 12:00 UTCJul 22, 18:05 UTC6h 5m
2026-07-21 CKK209 PVG → PVG Jul 21, 12:10 UTCJul 22, 05:25 UTC17h 15m
2026-07-21 CKK209 PVG → PVG Jul 21, 06:35 UTCJul 22, 05:25 UTC22h 50m
2026-07-21 CKK626 ORD → PVG Jul 21, 00:35 UTCJul 21, 23:10 UTC22h 35m
2026-07-21 CKK626 ORD → PVG Jul 21, 00:05 UTCJul 21, 13:10 UTC13h 5m
2026-07-20 CKK625 PVG → SEA Jul 20, 15:25 UTCJul 20, 20:50 UTC5h 25m
2026-07-20 CKK625 PVG → SEA Jul 20, 06:45 UTCJul 20, 14:05 UTC7h 20m
2026-07-19 CKK288 - Jul 19, 11:10 UTCJul 19, 11:35 UTC25m
2026-07-18 CKK287 - Jul 18, 19:15 UTCJul 19, 09:25 UTC14h 10m
2026-07-18 CKK261 - Jul 18, 16:45 UTCJul 18, 17:05 UTC20m
2026-07-17 CKK262 - Jul 17, 19:20 UTCJul 17, 19:55 UTC35m
2026-07-16 CKK606 - Jul 16, 23:44 UTCJul 17, 17:09 UTC17h 25m
2026-07-16 CKK606 - Jul 16, 20:35 UTCJul 17, 17:09 UTC20h 35m
2026-07-16 CKK606 - Jul 16, 18:34 UTCJul 17, 17:09 UTC22h 35m
2026-07-16 CKK606 - Jul 16, 17:54 UTCJul 17, 00:25 UTC6h 30m
2026-07-16 CKK605 - Jul 16, 08:10 UTCJul 16, 14:55 UTC6h 45m
2026-07-14 CKK226 - Jul 14, 16:55 UTCJul 15, 06:05 UTC13h 9m
2026-07-14 CKK225 ANC → ORD Jul 14, 08:45 UTCJul 14, 14:25 UTC5h 40m
2026-07-13 CKK225 - Jul 13, 15:20 UTCJul 14, 07:35 UTC16h 15m
2026-07-13 CKK225 - Jul 13, 09:00 UTCJul 14, 07:35 UTC22h 35m
2026-07-13 CKK226A - Jul 13, 04:35 UTCJul 14, 01:50 UTC21h 15m
2026-07-13 CKK226A - Jul 13, 04:05 UTCJul 14, 01:50 UTC21h 45m
2026-07-12 CKK225 ANC → ORD Jul 12, 19:30 UTCJul 13, 01:01 UTC5h 30m
2026-07-11 CKK225 - Jul 11, 22:35 UTCJul 12, 18:10 UTC19h 35m
2026-07-11 CKK225 - Jul 11, 21:20 UTCJul 12, 18:10 UTC20h 50m
2026-07-11 CKK226A - Jul 11, 18:35 UTCJul 12, 18:10 UTC23h 35m
2026-07-11 CKK226A - Jul 11, 16:35 UTCJul 12, 16:30 UTC23h 55m
2026-07-10 CKK225 ANC → ORD Jul 10, 10:55 UTCJul 10, 16:20 UTC5h 25m
2026-07-10 CKK225 - Jul 10, 01:55 UTCJul 10, 09:30 UTC7h 35m
2026-07-09 CKK225 - Jul 9, 05:05 UTCJul 10, 04:10 UTC23h 5m
2026-07-09 CKK277 - Jul 9, 00:40 UTCJul 9, 03:00 UTC2h 20m
2026-07-06 CKK226 - Jul 6, 17:30 UTCJul 7, 06:30 UTC13h 0m
2026-07-06 CKK225 PVG → LAX Jul 6, 09:15 UTCJul 6, 14:35 UTC5h 20m
2026-07-06 CKK225 PVG → LAX Jul 6, 00:20 UTCJul 6, 08:00 UTC7h 40m
2026-07-05 CKK225 PVG → LAX Jul 5, 11:15 UTCJul 6, 08:00 UTC20h 45m
2026-07-05 CKK286 - Jul 5, 10:30 UTCJul 5, 10:40 UTC10m
2026-07-04 CKK285 - Jul 4, 14:25 UTCJul 5, 07:10 UTC16h 45m
2026-07-04 CKK232 - Jul 4, 04:55 UTCJul 5, 04:30 UTC23h 35m
2026-07-04 CKK232 - Jul 4, 01:30 UTCJul 4, 14:55 UTC13h 25m
2026-07-03 CKK231 ANC → JFK Jul 3, 15:15 UTCJul 3, 21:50 UTC6h 35m
2026-07-02 CKK231 - Jul 2, 21:00 UTCJul 3, 14:00 UTC17h 0m
2026-07-02 CKK224 LAX → PVG Jul 2, 10:50 UTCJul 3, 08:25 UTC21h 35m
2026-07-01 CKK223 - Jul 1, 20:45 UTCJul 2, 07:05 UTC10h 20m

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-222H page for operator, model, and routing details .

Mode-S 781E2A frequently asked

What is Mode-S code 781E2A?
781E2A is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-222H.
Where is Mode-S 781E2A registered?
Mode-S code 781E2A is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E2A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E2A, octal 36017052, decimal 7,872,042.
What flights does 781E2A operate?
Mode-S 781E2A has broadcast 20 distinct callsigns, including CKK225, CKK227, CKK602, CKK235, CKK222.