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
Broadcasting now · callsign CCA117 · 6,150 ft
Flights observed
70
Distinct callsigns
20
Country
CN
Last broadcast
2h ago

Current position

781644 is currently broadcasting. Map zoomed to live position.

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
CCA980 Air China 6 2026-05-20
CCA979 Air China 6 2026-05-20
CCA1215 Air China 5 2026-05-19
CCA117 Air China 5 2026-05-30
CCA1216 Air China 4 2026-05-20
CCA118 Air China 3 2026-05-17
CCA792 Air China 2 2026-05-27
CCA1710 Air China 2 2026-05-21
CCA1575 Air China 2 2026-05-22
CCA1448 Air China 2 2026-05-02
CCA1447 Air China 2 2026-05-02
CCA1254 Air China 2 2026-05-09
CCA960 Air China 1 2026-05-25
CCA959 Air China 1 2026-05-25
CCA956 Air China 1 2026-05-01
CCA955 Air China 1 2026-05-01
CCA4132 Air China 1 2026-05-19
CCA1815 Air China 1 2026-05-07
CCA1706 Air China 1 2026-05-04
CCA1609 Air China 1 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 CCA117 PEK → HKG May 30, 10:00 UTCMay 30, 10:10 UTC10m
2026-05-29 CCA1403 PEK → KMG May 29, 22:55 UTCMay 30, 06:30 UTC7h 35m
2026-05-29 CCA1292 URC → PEK May 29, 16:05 UTCMay 29, 16:25 UTC20m
2026-05-28 CCA1453 - May 28, 23:50 UTCMay 29, 00:15 UTC25m
2026-05-27 CCA792 NQZ → XIY May 27, 15:10 UTCMay 28, 03:25 UTC12h 15m
2026-05-27 CCA792 NQZ → XIY May 27, 07:35 UTCMay 28, 03:25 UTC19h 50m
2026-05-26 CCA1577 PEK → KHN May 26, 09:25 UTCMay 26, 09:40 UTC15m
2026-05-25 CCA960 BKK → PEK May 25, 15:25 UTCMay 25, 16:20 UTC55m
2026-05-25 CCA959 PEK → BKK May 25, 09:50 UTCMay 25, 10:50 UTC1h 0m
2026-05-22 CCA1575 PEK → TAO May 22, 01:15 UTCMay 22, 01:25 UTC10m
2026-05-21 CCA1710 PEK → HGH May 21, 02:55 UTCMay 21, 03:05 UTC10m
2026-05-20 CCA980 BKK → PEK May 20, 18:50 UTCMay 20, 19:05 UTC15m
2026-05-20 CCA979 PEK → BKK May 20, 12:20 UTCMay 20, 16:55 UTC4h 35m
2026-05-20 CCA1216 KHG → PEK May 20, 09:40 UTCMay 20, 09:55 UTC15m
2026-05-19 CCA1215 PEK → KHG May 19, 22:55 UTCMay 19, 23:10 UTC15m
2026-05-19 CCA4132 PEK → CKG May 19, 04:00 UTCMay 19, 04:20 UTC20m
2026-05-18 CCA1601 PEK → SHE May 18, 13:05 UTCMay 18, 13:15 UTC10m
2026-05-18 CCA1216 KHG → PEK May 18, 09:35 UTCMay 18, 09:50 UTC15m
2026-05-17 CCA1215 PEK → KHG May 17, 23:00 UTCMay 17, 23:15 UTC15m
2026-05-17 CCA1202 XIY → PEK May 17, 10:40 UTCMay 17, 11:10 UTC30m
2026-05-17 CCA118 HKG → PEK May 17, 01:05 UTCMay 17, 01:20 UTC15m
2026-05-16 CCA117 PEK → HKG May 16, 12:31 UTCMay 16, 13:01 UTC30m
2026-05-14 CCA980 BKK → PEK May 14, 18:40 UTCMay 14, 19:35 UTC55m
2026-05-14 CCA979 PEK → BKK May 14, 15:55 UTCMay 14, 16:50 UTC55m
2026-05-11 CCA980 BKK → PEK May 11, 18:45 UTCMay 11, 19:35 UTC50m
2026-05-11 CCA979 PEK → BKK May 11, 15:40 UTCMay 11, 16:40 UTC1h 0m
2026-05-09 CCA1254 URC → PEK May 9, 12:35 UTCMay 9, 12:55 UTC20m
2026-05-09 CCA1253 PEK → URC May 9, 03:45 UTCMay 9, 03:55 UTC10m
2026-05-08 CCA1254 URC → PEK May 8, 02:59 UTCMay 8, 11:40 UTC8h 40m
2026-05-07 CCA1815 PEK → XMN May 7, 08:40 UTCMay 7, 08:50 UTC10m
2026-05-07 CCA1575 PEK → TAO May 7, 01:25 UTCMay 7, 01:35 UTC10m
2026-05-06 CCA980 BKK → PEK May 6, 18:55 UTCMay 6, 19:50 UTC55m
2026-05-06 CCA979 PEK → BKK May 6, 12:35 UTCMay 6, 17:10 UTC4h 35m
2026-05-06 CCA1216 KHG → PEK May 6, 09:50 UTCMay 6, 10:05 UTC15m
2026-05-05 CCA1215 PEK → KHG May 5, 22:50 UTCMay 5, 23:15 UTC25m
2026-05-05 CCA1250 KHG → PEK May 5, 16:55 UTCMay 5, 17:10 UTC15m
2026-05-05 CCA1249 PEK → KHG May 5, 05:35 UTCMay 5, 05:45 UTC10m
2026-05-04 CCA1706 PEK → HGH May 4, 03:24 UTCMay 4, 03:35 UTC10m
2026-05-03 CCA1294 URC → PEK May 3, 15:30 UTCMay 3, 15:45 UTC15m
2026-05-03 CCA1293 PEK → URC May 3, 07:05 UTCMay 3, 07:30 UTC25m
2026-05-02 CCA1609 PEK → CGQ May 2, 23:25 UTCMay 2, 23:35 UTC10m
2026-05-02 CCA1448 KMG → PEK May 2, 17:10 UTCMay 2, 17:25 UTC15m
2026-05-02 CCA1447 PEK → KMG May 2, 09:50 UTCMay 2, 10:20 UTC30m
2026-05-02 CCA1710 PEK → HGH May 2, 02:50 UTCMay 2, 03:00 UTC10m
2026-05-01 CCA980 BKK → PEK May 1, 18:50 UTCMay 1, 19:10 UTC20m
2026-05-01 CCA979 PEK → BKK May 1, 12:25 UTCMay 1, 17:15 UTC4h 50m
2026-05-01 CCA956 UBN → PEK May 1, 10:10 UTCMay 1, 10:25 UTC15m
2026-05-01 CCA955 PEK → UBN May 1, 05:55 UTCMay 1, 06:05 UTC10m
2026-05-01 CCA118 HKG → PEK May 1, 01:00 UTCMay 1, 01:15 UTC15m
2026-04-30 CCA117 PEK → HKG Apr 30, 10:15 UTCApr 30, 12:55 UTC2h 40m

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?
Yes. Mode-S 781644 is currently airborne.
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 CCA980, CCA979, CCA1215, CCA117, CCA1216.