Apparatus

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sensors Mode-S transponder

781BB4

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-650Z · COMAC ARJ-21-700 Xiangfeng

Hex
781BB4
Octal
36015664
Decimal
7,871,412
Country
CN
Tail
B-650Z
Type
AJ27
No current signal · last broadcast 7d ago
Flights observed
51
Distinct callsigns
20
Country
CN
Last broadcast
7d ago

Last known position

Most recent position reported by Mode-S 781BB4.

Country allocation

The ICAO 24-bit address 781BB4 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
CCA8140 - 5 2026-07-12
CCA8139 - 5 2026-07-11
CCA1112 - 5 2026-06-26
CCA1111 - 5 2026-06-26
CCA8192 - 4 2026-07-12
CCA1109 - 4 2026-06-26
CCA1150 Air China 3 2026-06-09
CCA1149 Air China 3 2026-06-09
CCA2658 Air China 2 2026-06-23
CCA1219 - 2 2026-06-20
CCA1139 Air China 2 2026-05-07
CCA2657 Air China 1 2026-06-21
CCA1282 - 1 2026-04-27
CCA1281 - 1 2026-04-27
CCA1263 - 1 2026-04-28
CCA1228 - 1 2026-04-28
CCA1227 - 1 2026-04-28
CCA1220 - 1 2026-06-20
CCA1142 Air China 1 2026-04-30
CCA1141 Air China 1 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 CCA8140 - Jul 12, 08:10 UTCJul 12, 08:25 UTC15m
2026-07-12 CCA8192 - Jul 12, 05:45 UTCJul 12, 06:10 UTC25m
2026-07-11 CCA8139 - Jul 11, 23:45 UTCJul 12, 00:05 UTC20m
2026-07-04 CCA8140 - Jul 4, 08:30 UTCJul 4, 09:00 UTC30m
2026-07-04 CCA8192 - Jul 4, 05:45 UTCJul 4, 06:10 UTC25m
2026-07-04 CCA8139 - Jul 4, 00:20 UTCJul 4, 00:50 UTC30m
2026-07-01 CCA8140 - Jul 1, 08:20 UTCJul 1, 08:45 UTC25m
2026-06-30 CCA8139 - Jun 30, 23:40 UTCJul 1, 00:00 UTC20m
2026-06-29 CCA8140 - Jun 29, 08:14 UTCJun 29, 08:29 UTC15m
2026-06-29 CCA8192 - Jun 29, 05:50 UTCJun 29, 06:09 UTC20m
2026-06-28 CCA8139 - Jun 28, 23:39 UTCJun 29, 00:05 UTC25m
2026-06-26 CCA1111 - Jun 26, 13:24 UTCJun 26, 13:45 UTC20m
2026-06-26 CCA1109 - Jun 26, 03:00 UTCJun 26, 03:10 UTC10m
2026-06-26 CCA1112 - Jun 26, 00:59 UTCJun 26, 01:20 UTC20m
2026-06-23 CCA2658 ZHA → TFU Jun 23, 13:00 UTCJun 23, 13:15 UTC15m
2026-06-21 CCA2658 ZHA → TFU Jun 21, 12:55 UTCJun 21, 13:04 UTC10m
2026-06-21 CCA2657 TFU → ZHA Jun 21, 10:54 UTCJun 21, 11:10 UTC15m
2026-06-20 CCA1111 - Jun 20, 13:09 UTCJun 20, 13:29 UTC20m
2026-06-20 CCA1220 - Jun 20, 10:20 UTCJun 20, 10:39 UTC20m
2026-06-20 CCA1219 - Jun 20, 06:49 UTCJun 20, 07:14 UTC25m
2026-06-13 CCA1109 - Jun 13, 03:15 UTCJun 13, 03:25 UTC10m
2026-06-09 CCA1150 DSN → PEK Jun 9, 12:15 UTCJun 9, 12:35 UTC20m
2026-06-09 CCA1149 PEK → DSN Jun 9, 09:30 UTCJun 9, 09:50 UTC20m
2026-06-09 CCA1109 - Jun 9, 03:10 UTCJun 9, 03:20 UTC10m
2026-06-09 CCA1112 HET → PEK Jun 9, 00:55 UTCJun 9, 01:15 UTC20m
2026-05-20 CCA8140 TSN → HET May 20, 08:10 UTCMay 20, 08:30 UTC20m
2026-05-20 CCA8192 DSN → TSN May 20, 05:40 UTCMay 20, 06:05 UTC25m
2026-05-19 CCA8139 HET → TSN May 19, 23:55 UTCMay 20, 00:20 UTC25m
2026-05-17 CCA1111 PEK → HET May 17, 13:20 UTCMay 17, 13:45 UTC25m
2026-05-17 CCA1150 DSN → PEK May 17, 11:25 UTCMay 17, 11:45 UTC20m
2026-05-17 CCA1149 PEK → DSN May 17, 09:00 UTCMay 17, 09:25 UTC25m
2026-05-07 CCA1139 PEK → YCU May 7, 10:25 UTCMay 7, 10:45 UTC20m
2026-05-07 CCA1118 DSN → PEK May 7, 05:55 UTCMay 7, 06:15 UTC20m
2026-05-07 CCA1117 PEK → DSN May 7, 02:25 UTCMay 7, 02:50 UTC25m
2026-05-06 CCA1109 - May 6, 03:00 UTCMay 6, 03:10 UTC10m
2026-05-06 CCA1112 HET → PEK May 6, 00:50 UTCMay 6, 01:10 UTC20m
2026-04-30 CCA1111 PEK → HET Apr 30, 13:20 UTCApr 30, 13:40 UTC20m
2026-04-30 CCA1150 DSN → PEK Apr 30, 11:05 UTCApr 30, 11:25 UTC20m
2026-04-30 CCA1149 PEK → DSN Apr 30, 08:15 UTCApr 30, 08:35 UTC20m
2026-04-30 CCA1142 DSN → PEK Apr 30, 01:50 UTCApr 30, 02:10 UTC20m
2026-04-29 CCA1141 PEK → DSN Apr 29, 23:05 UTCApr 29, 23:25 UTC20m
2026-04-28 CCA1263 - Apr 28, 10:50 UTCApr 28, 11:10 UTC20m
2026-04-28 CCA1228 - Apr 28, 08:25 UTCApr 28, 08:45 UTC20m
2026-04-28 CCA1227 - Apr 28, 04:20 UTCApr 28, 04:45 UTC25m
2026-04-27 CCA1282 - Apr 27, 05:05 UTCApr 27, 05:25 UTC20m
2026-04-27 CCA1281 - Apr 27, 01:30 UTCApr 27, 01:50 UTC20m
2026-04-26 CCA1219 - Apr 26, 07:05 UTCApr 26, 07:25 UTC20m
2026-04-24 CCA1139 PEK → YCU Apr 24, 10:20 UTCApr 24, 10:40 UTC20m
2026-04-24 CCA1112 HET → PEK Apr 24, 00:55 UTCApr 24, 01:15 UTC20m
2026-04-20 CCA1111 PEK → HET Apr 20, 14:00 UTCApr 20, 14:20 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-650Z page for operator, model, and routing details .

Mode-S 781BB4 frequently asked

What is Mode-S code 781BB4?
781BB4 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-650Z.
Where is Mode-S 781BB4 registered?
Mode-S code 781BB4 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781BB4 broadcasting right now?
No active broadcast right now. Last signal was 7d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781BB4, octal 36015664, decimal 7,871,412.
What flights does 781BB4 operate?
Mode-S 781BB4 has broadcast 20 distinct callsigns, including CCA8140, CCA8139, CCA1112, CCA1111, CCA8192.