Apparatus

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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
Broadcasting now · callsign CKK205 · 32,000 ft
Flights observed
7
Distinct callsigns
2
Country
CN
Last broadcast
1d ago

Current position

781E2A is currently broadcasting. Map zoomed to live position.

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 2 distinct

Callsign Airline Flights Last seen
CKK228A - 4 2026-04-13
CKK227 China Cargo Airlines 3 2026-04-13

Recent flights last 7

DateFlightRouteTakeoffLandingDuration
2026-04-13 CKK228A - Apr 13, 16:25 UTCApr 13, 17:15 UTC50m
2026-04-13 CKK228A - Apr 13, 10:10 UTCApr 13, 10:20 UTC10m
2026-04-13 CKK228A - Apr 13, 04:20 UTCApr 13, 05:40 UTC1h 20m
2026-04-13 CKK228A - Apr 13, 04:05 UTCApr 13, 04:15 UTC10m
2026-04-13 CKK227 PVG → ANC Apr 13, 00:20 UTCApr 13, 00:35 UTC15m
2026-04-12 CKK227 PVG → ANC Apr 12, 23:55 UTCApr 13, 00:35 UTC40m
2026-04-12 CKK227 PVG → ANC Apr 12, 18:40 UTCApr 12, 19:20 UTC40m

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?
Yes. Mode-S 781E2A is currently airborne.
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 2 distinct callsigns, including CKK228A, CKK227.