Apparatus

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sensors Mode-S transponder

781F71

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-91AF · COMAC ARJ-21-700 Xiangfeng

Hex
781F71
Octal
36017561
Decimal
7,872,369
Country
CN
Tail
B-91AF
Type
AJ27
No current signal · last broadcast 5d ago
Flights observed
120
Distinct callsigns
20
Country
CN
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S 781F71.

Country allocation

The ICAO 24-bit address 781F71 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
CCA1141 - 10 2026-07-16
CCA1142 - 9 2026-07-17
CCA1139 - 8 2026-07-18
CCA1109 - 7 2026-07-14
CCA1118 Air China 5 2026-07-21
CCA1117 Air China 5 2026-07-21
CCA1112 - 5 2026-07-14
CCA8192 - 4 2026-07-08
CCA8140 - 4 2026-07-08
CCA8139 - 4 2026-07-07
CCA1111 Air China 4 2026-07-24
CCA1687 Air China 3 2026-07-23
CCA1683 Air China 3 2026-07-23
CCA1597 - 3 2026-07-16
CCA1282 - 3 2026-07-24
CCA1281 - 3 2026-07-24
CCA1220 - 3 2026-06-12
CCA1214 - 3 2026-06-26
CCA1213 - 3 2026-06-25
CCA1150 - 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-24 CCA1111 PEK → HET Jul 24, 13:30 UTCJul 24, 13:50 UTC20m
2026-07-24 CCA1150 - Jul 24, 11:10 UTCJul 24, 11:30 UTC20m
2026-07-24 CCA1149 PEK → DSN Jul 24, 08:40 UTCJul 24, 09:00 UTC20m
2026-07-24 CCA1282 - Jul 24, 05:05 UTCJul 24, 05:25 UTC20m
2026-07-24 CCA1281 - Jul 24, 01:20 UTCJul 24, 01:45 UTC25m
2026-07-23 CCA1683 PEK → DQA Jul 23, 13:10 UTCJul 23, 13:20 UTC10m
2026-07-23 CCA1687 PEK → DQA Jul 23, 05:20 UTCJul 23, 05:30 UTC10m
2026-07-22 CCA1279 - Jul 22, 22:55 UTCJul 22, 23:20 UTC25m
2026-07-21 CCA1929 - Jul 21, 10:10 UTCJul 21, 10:20 UTC10m
2026-07-21 CCA1118 DSN → PEK Jul 21, 06:25 UTCJul 21, 06:45 UTC20m
2026-07-21 CCA1117 PEK → DSN Jul 21, 03:15 UTCJul 21, 03:35 UTC20m
2026-07-20 CCA1118 - Jul 20, 16:25 UTCJul 20, 16:35 UTC10m
2026-07-20 CCA1117 PEK → DSN Jul 20, 13:30 UTCJul 20, 13:55 UTC25m
2026-07-20 CCA9684 SZX → CKG Jul 20, 09:35 UTCJul 20, 09:50 UTC15m
2026-07-20 CCA9683 PEK → SZX Jul 20, 06:00 UTCJul 20, 06:15 UTC15m
2026-07-20 CCA9661 - Jul 20, 00:50 UTCJul 20, 01:00 UTC10m
2026-07-19 CCA1263 - Jul 19, 10:40 UTCJul 19, 11:00 UTC20m
2026-07-19 CCA9512 - Jul 19, 07:10 UTCJul 19, 07:25 UTC15m
2026-07-19 CCA9511 PEK → YCU Jul 19, 03:50 UTCJul 19, 04:05 UTC15m
2026-07-18 CCA1139 - Jul 18, 10:45 UTCJul 18, 10:55 UTC10m
2026-07-18 CCA1282 - Jul 18, 05:20 UTCJul 18, 05:35 UTC15m
2026-07-18 CCA1281 - Jul 18, 01:25 UTCJul 18, 01:50 UTC25m
2026-07-17 CCA1140 - Jul 17, 13:20 UTCJul 17, 13:35 UTC15m
2026-07-17 CCA1139 - Jul 17, 10:20 UTCJul 17, 10:30 UTC10m
2026-07-17 CCA1142 - Jul 17, 01:45 UTCJul 17, 02:05 UTC20m
2026-07-16 CCA1141 - Jul 16, 22:59 UTCJul 16, 23:25 UTC25m
2026-07-16 CCA1597 - Jul 16, 12:55 UTCJul 16, 13:05 UTC10m
2026-07-16 CCA1142 - Jul 16, 03:20 UTCJul 16, 03:40 UTC20m
2026-07-16 CCA1141 - Jul 16, 00:30 UTCJul 16, 00:50 UTC20m
2026-07-15 CCA1139 - Jul 15, 09:55 UTCJul 15, 10:10 UTC15m
2026-07-15 CCA9512 - Jul 15, 07:10 UTCJul 15, 07:20 UTC10m
2026-07-15 CCA9511 - Jul 15, 03:50 UTCJul 15, 04:05 UTC15m
2026-07-14 CCA1139 - Jul 14, 10:10 UTCJul 14, 10:25 UTC15m
2026-07-14 CCA1109 - Jul 14, 03:20 UTCJul 14, 03:30 UTC10m
2026-07-14 CCA1112 - Jul 14, 00:55 UTCJul 14, 01:15 UTC20m
2026-07-08 CCA8140 - Jul 8, 08:20 UTCJul 8, 08:45 UTC25m
2026-07-08 CCA8192 - Jul 8, 05:40 UTCJul 8, 06:05 UTC25m
2026-07-07 CCA8139 - Jul 7, 23:40 UTCJul 8, 00:00 UTC20m
2026-06-27 CCA1111 - Jun 27, 13:09 UTCJun 27, 13:40 UTC30m
2026-06-27 CCA1142 - Jun 27, 01:54 UTCJun 27, 02:20 UTC25m
2026-06-26 CCA1141 PEK → DSN Jun 26, 23:00 UTCJun 26, 23:19 UTC20m
2026-06-26 CCA1118 - Jun 26, 15:05 UTCJun 26, 15:25 UTC20m
2026-06-26 CCA1117 - Jun 26, 12:34 UTCJun 26, 12:55 UTC20m
2026-06-26 CCA1214 - Jun 26, 03:20 UTCJun 26, 03:39 UTC20m
2026-06-25 CCA1213 - Jun 25, 23:39 UTCJun 26, 00:05 UTC25m
2026-06-25 CCA1597 - Jun 25, 15:24 UTCJun 25, 15:34 UTC10m
2026-06-25 CCA1109 - Jun 25, 03:15 UTCJun 25, 03:24 UTC10m
2026-06-24 CCA1139 - Jun 24, 10:14 UTCJun 24, 10:35 UTC20m
2026-06-24 CCA1282 - Jun 24, 05:05 UTCJun 24, 05:29 UTC25m
2026-06-24 CCA1281 - Jun 24, 01:19 UTCJun 24, 01:44 UTC25m

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-91AF page for operator, model, and routing details .

Mode-S 781F71 frequently asked

What is Mode-S code 781F71?
781F71 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-91AF.
Where is Mode-S 781F71 registered?
Mode-S code 781F71 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F71 broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F71, octal 36017561, decimal 7,872,369.
What flights does 781F71 operate?
Mode-S 781F71 has broadcast 20 distinct callsigns, including CCA1141, CCA1142, CCA1139, CCA1109, CCA1118.