Apparatus

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sensors Mode-S transponder

781644

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-209K · BOEING 737 MAX 8

Hex
781644
Octal
36013104
Decimal
7,870,020
Country
CN
Tail
B-209K
Type
B38M
No current signal · last broadcast Jul 26, 15:25 UTC
Flights observed
193
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 15:25 UTC

Last known position

Most recent position reported by Mode-S 781644.

Country allocation

The ICAO 24-bit address 781644 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
CCA960 Air China 10 2026-07-24
CCA117 - 10 2026-07-12
CCA959 Air China 9 2026-07-24
CCA980 - 8 2026-06-18
CCA979 - 8 2026-06-18
CCA1215 Air China 8 2026-07-20
CCA1216 Air China 7 2026-07-21
CCA118 - 7 2026-07-13
CCA792 - 4 2026-07-07
CCA1476 - 4 2026-07-04
CCA1447 - 4 2026-07-04
CCA902 Air China 3 2026-07-25
CCA901 Air China 3 2026-07-25
CCA1813 Air China 3 2026-07-20
CCA1448 Air China 3 2026-07-04
CCA1258 - 3 2026-06-29
CCA1257 - 3 2026-06-28
CCA1250 - 3 2026-07-17
CCA1245 - 3 2026-07-07
CCA1244 - 3 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA9666 SZX → HGH Jul 26, 15:05 UTCJul 26, 15:25 UTC20m
2026-07-26 CCA9665 HGH → SZX Jul 26, 02:45 UTCJul 26, 03:00 UTC15m
2026-07-25 CCA724 UBN → PEK Jul 25, 12:15 UTCJul 25, 12:35 UTC20m
2026-07-25 CCA723 PEK → UBN Jul 25, 08:05 UTCJul 25, 08:20 UTC15m
2026-07-25 CCA902 UBN → PEK Jul 25, 05:45 UTCJul 25, 06:10 UTC25m
2026-07-25 CCA901 PEK → UBN Jul 25, 01:30 UTCJul 25, 01:45 UTC15m
2026-07-24 CCA960 BKK → PEK Jul 24, 13:10 UTCJul 24, 17:20 UTC4h 10m
2026-07-24 CCA959 PEK → BKK Jul 24, 06:50 UTCJul 24, 11:20 UTC4h 30m
2026-07-24 CCA9614 DLU → PEK Jul 24, 03:50 UTCJul 24, 04:10 UTC20m
2026-07-23 CCA9613 PEK → DLU Jul 23, 23:00 UTCJul 23, 23:25 UTC25m
2026-07-23 CCA1244 - Jul 23, 13:15 UTCJul 23, 13:40 UTC25m
2026-07-22 CCA9666 SZX → HGH Jul 22, 14:15 UTCJul 22, 14:35 UTC20m
2026-07-21 CCA1216 KHG → PEK Jul 21, 09:40 UTCJul 21, 10:05 UTC25m
2026-07-20 CCA1215 PEK → KHG Jul 20, 22:55 UTCJul 20, 23:05 UTC10m
2026-07-20 CCA960 BKK → PEK Jul 20, 17:15 UTCJul 20, 17:25 UTC10m
2026-07-20 CCA960 BKK → PEK Jul 20, 12:55 UTCJul 20, 14:40 UTC1h 45m
2026-07-20 CCA959 PEK → BKK Jul 20, 06:25 UTCJul 20, 10:55 UTC4h 30m
2026-07-20 CCA1813 PEK → HFE Jul 20, 00:25 UTCJul 20, 00:35 UTC10m
2026-07-18 CCA1216 - Jul 18, 09:25 UTCJul 18, 09:45 UTC20m
2026-07-17 CCA1215 - Jul 17, 22:49 UTCJul 17, 23:05 UTC15m
2026-07-17 CCA1250 - Jul 17, 16:29 UTCJul 17, 16:49 UTC20m
2026-07-17 CCA1249 PEK → KHG Jul 17, 06:10 UTCJul 17, 06:29 UTC20m
2026-07-17 CCA1450 CKG → PEK Jul 17, 04:04 UTCJul 17, 04:14 UTC10m
2026-07-16 CCA1449 - Jul 16, 11:30 UTCJul 16, 11:54 UTC25m
2026-07-16 CCA9632 - Jul 16, 09:25 UTCJul 16, 09:35 UTC10m
2026-07-16 CCA9631 - Jul 16, 02:10 UTCJul 16, 02:30 UTC20m
2026-07-14 CCA1244 - Jul 14, 12:45 UTCJul 14, 13:05 UTC20m
2026-07-13 CCA1243 - Jul 13, 23:05 UTCJul 13, 23:20 UTC15m
2026-07-13 CCA960 - Jul 13, 14:05 UTCJul 13, 14:35 UTC30m
2026-07-13 CCA960 - Jul 13, 12:45 UTCJul 13, 13:00 UTC15m
2026-07-13 CCA959 - Jul 13, 10:20 UTCJul 13, 10:30 UTC10m
2026-07-13 CCA959 - Jul 13, 06:10 UTCJul 13, 09:15 UTC3h 5m
2026-07-13 CCA118 - Jul 13, 00:55 UTCJul 13, 01:10 UTC15m
2026-07-12 CCA117 - Jul 12, 12:25 UTCJul 12, 12:55 UTC30m
2026-07-12 CCA117 - Jul 12, 10:01 UTCJul 12, 10:15 UTC15m
2026-07-12 CCA1296 - Jul 12, 05:55 UTCJul 12, 06:15 UTC20m
2026-07-12 CCA714 - Jul 12, 00:01 UTCJul 12, 00:20 UTC20m
2026-07-11 CCA714 SVO → SVO Jul 11, 20:25 UTCJul 11, 20:45 UTC20m
2026-07-11 CCA713 - Jul 11, 12:50 UTCJul 11, 13:20 UTC30m
2026-07-10 CCA1973 - Jul 10, 14:25 UTCJul 11, 13:00 UTC22h 36m
2026-07-10 CCA1974 - Jul 10, 10:20 UTCJul 10, 10:40 UTC20m
2026-07-09 CCA1295 - Jul 9, 12:25 UTCJul 9, 12:40 UTC15m
2026-07-09 CCA1274 - Jul 9, 05:40 UTCJul 9, 06:00 UTC20m
2026-07-09 CCA1273 - Jul 9, 01:00 UTCJul 9, 01:20 UTC20m
2026-07-07 CCA1461 - Jul 7, 23:40 UTCJul 8, 00:05 UTC25m
2026-07-07 CCA1246 - Jul 7, 16:40 UTCJul 7, 17:00 UTC20m
2026-07-07 CCA1245 - Jul 7, 06:20 UTCJul 7, 06:40 UTC20m
2026-07-07 CCA792 - Jul 7, 03:00 UTCJul 7, 03:30 UTC30m
2026-07-06 CCA792 - Jul 6, 15:25 UTCJul 6, 19:50 UTC4h 25m
2026-07-06 CCA902 - Jul 6, 05:15 UTCJul 6, 05:35 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-209K page for operator, model, and routing details .

Mode-S 781644 frequently asked

What is Mode-S code 781644?
781644 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-209K.
Where is Mode-S 781644 registered?
Mode-S code 781644 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781644 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 15:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781644, octal 36013104, decimal 7,870,020.
What flights does 781644 operate?
Mode-S 781644 has broadcast 20 distinct callsigns, including CCA960, CCA117, CCA959, CCA980, CCA979.