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 1d ago
Flights observed
48
Distinct callsigns
20
Country
CN
Last broadcast
1d 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 Air China 4 2026-06-04
CCA1109 - 4 2026-06-04
CCA8192 Air China 3 2026-05-02
CCA8140 Air China 3 2026-05-02
CCA8139 Air China 3 2026-05-02
CCA1142 Air China 3 2026-06-05
CCA1112 Air China 3 2026-06-04
CCA1220 - 2 2026-05-08
CCA1214 - 2 2026-05-08
CCA1213 - 2 2026-05-07
CCA1150 Air China 2 2026-05-26
CCA1149 Air China 2 2026-05-26
CCA1140 Air China 2 2026-05-04
CCA1139 Air China 2 2026-05-04
CCA1111 Air China 2 2026-06-03
CCA1687 Air China 1 2026-06-03
CCA1597 Air China 1 2026-06-04
CCA1545 Air China 1 2026-05-28
CCA1228 - 1 2026-05-07
CCA1227 - 1 2026-05-07

Recent flights last 48

DateFlightRouteTakeoffLandingDuration
2026-06-05 CCA1142 DSN → PEK Jun 5, 01:35 UTCJun 5, 01:55 UTC20m
2026-06-04 CCA1141 PEK → DSN Jun 4, 22:50 UTCJun 4, 23:15 UTC25m
2026-06-04 CCA1597 PEK → WEH Jun 4, 12:50 UTCJun 4, 13:00 UTC10m
2026-06-04 CCA1109 - Jun 4, 03:30 UTCJun 4, 03:40 UTC10m
2026-06-04 CCA1112 HET → PEK Jun 4, 00:55 UTCJun 4, 01:10 UTC15m
2026-06-03 CCA1111 PEK → HET Jun 3, 13:10 UTCJun 3, 13:35 UTC25m
2026-06-03 CCA1687 PEK → DQA Jun 3, 04:50 UTCJun 3, 05:00 UTC10m
2026-05-30 CCA1141 PEK → DSN May 30, 23:00 UTCMay 30, 23:25 UTC25m
2026-05-28 CCA1545 PEK → YNT May 28, 00:25 UTCMay 28, 00:35 UTC10m
2026-05-27 CCA1127 PEK → YCU May 27, 04:39 UTCMay 27, 05:04 UTC25m
2026-05-27 CCA1142 DSN → PEK May 27, 01:59 UTCMay 27, 02:19 UTC20m
2026-05-26 CCA1141 PEK → DSN May 26, 23:10 UTCMay 26, 23:35 UTC25m
2026-05-26 CCA1150 DSN → PEK May 26, 11:24 UTCMay 26, 11:44 UTC20m
2026-05-26 CCA1149 PEK → DSN May 26, 08:39 UTCMay 26, 08:59 UTC20m
2026-05-26 CCA1109 - May 26, 03:19 UTCMay 26, 03:35 UTC15m
2026-05-26 CCA1112 HET → PEK May 26, 00:54 UTCMay 26, 01:14 UTC20m
2026-05-08 CCA1220 - May 8, 10:39 UTCMay 8, 10:54 UTC15m
2026-05-08 CCA1219 - May 8, 06:50 UTCMay 8, 07:09 UTC20m
2026-05-08 CCA1214 - May 8, 02:49 UTCMay 8, 03:09 UTC20m
2026-05-07 CCA1213 - May 7, 23:05 UTCMay 7, 23:24 UTC20m
2026-05-07 CCA1228 - May 7, 08:05 UTCMay 7, 08:25 UTC20m
2026-05-07 CCA1227 - May 7, 04:25 UTCMay 7, 04:50 UTC25m
2026-05-07 CCA1142 DSN → PEK May 7, 01:40 UTCMay 7, 01:55 UTC15m
2026-05-06 CCA1141 PEK → DSN May 6, 23:05 UTCMay 6, 23:30 UTC25m
2026-05-05 CCA1118 DSN → PEK May 5, 06:25 UTCMay 5, 06:45 UTC20m
2026-05-05 CCA1117 PEK → DSN May 5, 03:00 UTCMay 5, 03:25 UTC25m
2026-05-04 CCA1140 YCU → PEK May 4, 13:25 UTCMay 4, 13:35 UTC10m
2026-05-04 CCA1139 PEK → YCU May 4, 10:10 UTCMay 4, 10:20 UTC10m
2026-05-04 CCA1109 - May 4, 03:19 UTCMay 4, 03:30 UTC10m
2026-05-04 CCA1112 HET → PEK May 4, 00:50 UTCMay 4, 01:10 UTC20m
2026-05-02 CCA8140 TSN → HET May 2, 08:25 UTCMay 2, 08:45 UTC20m
2026-05-02 CCA8192 DSN → TSN May 2, 05:45 UTCMay 2, 06:05 UTC20m
2026-05-02 CCA8139 HET → TSN May 2, 00:15 UTCMay 2, 00:35 UTC20m
2026-04-29 CCA8140 TSN → HET Apr 29, 08:20 UTCApr 29, 08:34 UTC15m
2026-04-29 CCA8192 DSN → TSN Apr 29, 05:55 UTCApr 29, 06:19 UTC25m
2026-04-28 CCA8139 HET → TSN Apr 28, 23:45 UTCApr 29, 00:05 UTC20m
2026-04-25 CCA8140 TSN → HET Apr 25, 08:35 UTCApr 25, 08:50 UTC15m
2026-04-25 CCA8192 DSN → TSN Apr 25, 05:50 UTCApr 25, 06:10 UTC20m
2026-04-25 CCA8139 HET → TSN Apr 25, 00:20 UTCApr 25, 00:40 UTC20m
2026-04-22 CCA1111 PEK → HET Apr 22, 13:15 UTCApr 22, 13:30 UTC15m
2026-04-22 CCA1150 DSN → PEK Apr 22, 11:15 UTCApr 22, 11:30 UTC15m
2026-04-22 CCA1149 PEK → DSN Apr 22, 08:30 UTCApr 22, 08:50 UTC20m
2026-04-22 CCA1214 - Apr 22, 02:55 UTCApr 22, 03:15 UTC20m
2026-04-21 CCA1213 - Apr 21, 23:00 UTCApr 21, 23:25 UTC25m
2026-04-21 CCA1220 - Apr 21, 11:00 UTCApr 21, 11:15 UTC15m
2026-04-20 CCA1140 YCU → PEK Apr 20, 13:35 UTCApr 20, 13:45 UTC10m
2026-04-20 CCA1139 PEK → YCU Apr 20, 10:25 UTCApr 20, 10:35 UTC10m
2026-04-19 CCA1109 - Apr 19, 14:20 UTCApr 19, 14:35 UTC15m

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 1d 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, CCA1109, CCA8192, CCA8140, CCA8139.