Apparatus

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sensors Mode-S transponder

781E2B

ICAO 24-bit transponder address · allocated to China

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

Hex
781E2B
Octal
36017053
Decimal
7,872,043
Country
CN
Tail
B-222J
Type
B77L
No current signal · last broadcast 1h ago
Flights observed
0
Distinct callsigns
0
Country
CN
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 781E2B.

Country allocation

The ICAO 24-bit address 781E2B 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.

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-01 CKK221 PVG → LAX Jun 1, 19:05 UTCJun 2, 18:45 UTC23h 40m
2026-06-01 CKK224 LAX → PVG Jun 1, 09:30 UTCJun 2, 08:45 UTC23h 15m
2026-05-31 CKK223 PVG → LAX May 31, 13:05 UTCJun 1, 06:45 UTC17h 40m
2026-05-30 CKK288 - May 30, 18:25 UTCMay 31, 10:00 UTC15h 35m
2026-05-29 CKK236 LAX → CKG May 29, 20:50 UTCMay 30, 16:45 UTC19h 55m
2026-05-29 CKK236 LAX → CKG May 29, 19:20 UTCMay 30, 01:40 UTC6h 20m
2026-05-29 CKK235 - May 29, 00:05 UTCMay 29, 16:15 UTC16h 10m
2026-05-28 CKK602 BUD → FRA May 28, 18:00 UTCMay 29, 16:15 UTC22h 15m
2026-05-27 CKK601 - May 27, 16:50 UTCMay 28, 12:30 UTC19h 40m
2026-05-27 CKK601 - May 27, 14:50 UTCMay 28, 12:30 UTC21h 40m
2026-05-27 CKK602 BUD → BUD May 27, 13:35 UTCMay 28, 12:30 UTC22h 55m
2026-05-27 CKK601 - May 27, 00:55 UTCMay 27, 04:45 UTC3h 50m
2026-05-25 CKK236 LAX → CKG May 25, 16:50 UTCMay 25, 22:40 UTC5h 49m
2026-05-24 CKK235 - May 24, 19:00 UTCMay 25, 13:40 UTC18h 40m
2026-05-24 CKK235 - May 24, 16:50 UTCMay 25, 13:40 UTC20h 50m
2026-05-24 CKK236 LAX → CKG May 24, 14:50 UTCMay 25, 13:40 UTC22h 50m
2026-05-24 CKK236 LAX → CKG May 24, 14:35 UTCMay 25, 12:45 UTC22h 10m
2026-05-24 CKK235 - May 24, 02:10 UTCMay 24, 09:00 UTC6h 50m
2026-05-22 CKK236 LAX → CKG May 22, 13:20 UTCMay 22, 19:25 UTC6h 5m
2026-05-22 CKK235 - May 22, 05:35 UTCMay 22, 09:50 UTC4h 15m
2026-05-20 CKK236 LAX → CKG May 20, 12:30 UTCMay 20, 14:45 UTC2h 15m
2026-05-20 CKK235 - May 20, 07:30 UTCMay 20, 09:15 UTC1h 45m
2026-05-19 CKK235 - May 19, 13:25 UTCMay 20, 09:15 UTC19h 51m
2026-05-19 CKK602 - May 19, 08:50 UTCMay 20, 08:45 UTC23h 56m
2026-05-19 CKK602 - May 19, 08:15 UTCMay 19, 14:15 UTC6h 0m
2026-05-19 CKK601 - May 19, 01:40 UTCMay 19, 05:35 UTC3h 55m
2026-05-17 CKK224 LAX → PVG May 17, 09:45 UTCMay 17, 21:55 UTC12h 10m
2026-05-16 CKK223 PVG → LAX May 16, 20:45 UTCMay 17, 06:55 UTC10h 10m
2026-05-16 CKK223 PVG → LAX May 16, 09:56 UTCMay 17, 06:55 UTC21h 0m
2026-05-16 CKK223 PVG → LAX May 16, 03:45 UTCMay 16, 22:20 UTC18h 35m
2026-05-15 CKK223 PVG → LAX May 15, 22:50 UTCMay 16, 22:20 UTC23h 30m
2026-05-15 CKK228 ORD → PVG May 15, 21:50 UTCMay 16, 20:45 UTC22h 56m
2026-05-15 CKK227 PVG → ANC May 15, 13:15 UTCMay 15, 18:50 UTC5h 34m
2026-05-14 CKK227 PVG → ANC May 14, 18:40 UTCMay 15, 12:05 UTC17h 25m
2026-05-13 CKK206 AMS → PVG May 13, 22:15 UTCMay 14, 16:40 UTC18h 25m
2026-05-13 CKK206 AMS → PVG May 13, 18:50 UTCMay 14, 16:40 UTC21h 50m
2026-05-13 CKK206 AMS → PVG May 13, 17:00 UTCMay 14, 16:40 UTC23h 40m
2026-05-13 CKK205 PVG → AMS May 13, 07:10 UTCMay 13, 13:50 UTC6h 40m
2026-05-12 CKK205 PVG → AMS May 12, 12:40 UTCMay 13, 10:45 UTC22h 5m
2026-05-12 CKK232 JFK → PVG May 12, 02:45 UTCMay 12, 12:40 UTC9h 55m
2026-05-11 CKK231 PVG → SEA May 11, 13:55 UTCMay 11, 20:10 UTC6h 15m
2026-05-11 CKK231 PVG → SEA May 11, 05:10 UTCMay 11, 12:35 UTC7h 25m
2026-05-10 CKK231 PVG → SEA May 10, 12:54 UTCMay 11, 12:35 UTC23h 40m
2026-05-09 CKK232 JFK → PVG May 9, 23:30 UTCMay 10, 13:30 UTC14h 0m
2026-05-09 CKK231 PVG → SEA May 9, 14:45 UTCMay 9, 21:05 UTC6h 20m
2026-05-08 CKK231 PVG → SEA May 8, 18:50 UTCMay 9, 13:25 UTC18h 35m
2026-05-08 CKK206 AMS → PVG May 8, 17:15 UTCMay 9, 13:25 UTC20h 10m
2026-05-07 CKK205 PVG → AMS May 7, 18:50 UTCMay 8, 14:35 UTC19h 45m
2026-05-06 CKK261 PVG → TPE May 6, 22:55 UTCMay 7, 16:40 UTC17h 46m
2026-05-06 CKK263 PVG → HKG May 6, 20:05 UTCMay 6, 20:25 UTC20m

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

Mode-S 781E2B frequently asked

What is Mode-S code 781E2B?
781E2B is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-222J.
Where is Mode-S 781E2B registered?
Mode-S code 781E2B is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781E2B broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781E2B, octal 36017053, decimal 7,872,043.