Apparatus

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sensors Mode-S transponder

781F6E

ICAO 24-bit transponder address · allocated to China

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

Hex
781F6E
Octal
36017556
Decimal
7,872,366
Country
CN
Tail
B-91AC
Type
AJ27
No current signal · last broadcast Jul 22, 14:05 UTC
Flights observed
88
Distinct callsigns
20
Country
CN
Last broadcast
Jul 22, 14:05 UTC

Last known position

Most recent position reported by Mode-S 781F6E.

Country allocation

The ICAO 24-bit address 781F6E 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
CCA1149 Air China 7 2026-07-20
CCA1150 - 6 2026-07-22
CCA1213 - 4 2026-07-20
CCA1118 - 4 2026-07-17
CCA1117 - 4 2026-07-17
CCA1112 - 4 2026-07-13
CCA1111 Air China 4 2026-07-22
CCA1281 - 3 2026-07-22
CCA1220 - 3 2026-07-04
CCA1219 - 3 2026-07-04
CCA1214 - 3 2026-07-21
CCA1142 - 3 2026-07-15
CCA1141 - 3 2026-07-14
CCA8192 Air China 2 2026-06-10
CCA8140 Air China 2 2026-06-10
CCA8139 Air China 2 2026-06-09
CCA1697 - 2 2026-07-03
CCA1683 Air China 2 2026-06-28
CCA1282 - 2 2026-07-20
CCA1264 - 2 2026-04-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 CCA1111 PEK → HET Jul 22, 13:45 UTCJul 22, 14:05 UTC20m
2026-07-22 CCA1150 - Jul 22, 11:25 UTCJul 22, 11:40 UTC15m
2026-07-22 CCA1281 - Jul 22, 01:30 UTCJul 22, 01:50 UTC20m
2026-07-21 CCA1688 DDG → PEK Jul 21, 10:30 UTCJul 21, 10:40 UTC10m
2026-07-21 CCA1214 - Jul 21, 03:40 UTCJul 21, 03:55 UTC15m
2026-07-20 CCA1213 - Jul 20, 23:45 UTCJul 21, 00:10 UTC25m
2026-07-20 CCA1149 PEK → DSN Jul 20, 09:25 UTCJul 20, 09:35 UTC10m
2026-07-20 CCA1282 - Jul 20, 05:15 UTCJul 20, 05:35 UTC20m
2026-07-20 CCA1281 - Jul 20, 01:35 UTCJul 20, 02:00 UTC25m
2026-07-18 CCA1150 - Jul 18, 11:30 UTCJul 18, 11:55 UTC25m
2026-07-18 CCA1149 - Jul 18, 09:05 UTCJul 18, 09:25 UTC20m
2026-07-17 CCA1118 - Jul 17, 15:29 UTCJul 17, 15:55 UTC25m
2026-07-17 CCA1117 - Jul 17, 13:00 UTCJul 17, 13:15 UTC15m
2026-07-17 CCA9797 - Jul 17, 06:29 UTCJul 17, 06:45 UTC15m
2026-07-17 CCA9661 - Jul 17, 00:40 UTCJul 17, 00:50 UTC10m
2026-07-15 CCA1929 - Jul 15, 10:35 UTCJul 15, 10:55 UTC20m
2026-07-15 CCA1142 - Jul 15, 01:55 UTCJul 15, 02:20 UTC25m
2026-07-14 CCA1141 - Jul 14, 23:05 UTCJul 14, 23:25 UTC20m
2026-07-14 CCA1270 - Jul 14, 09:40 UTCJul 14, 13:15 UTC3h 35m
2026-07-14 CCA1559 - Jul 14, 04:45 UTCJul 14, 04:55 UTC10m
2026-07-13 CCA1279 - Jul 13, 23:20 UTCJul 14, 02:45 UTC3h 25m
2026-07-13 CCA9506 - Jul 13, 14:20 UTCJul 13, 14:40 UTC20m
2026-07-13 CCA9505 - Jul 13, 10:15 UTCJul 13, 10:35 UTC20m
2026-07-13 CCA9511 - Jul 13, 03:25 UTCJul 13, 03:40 UTC15m
2026-07-13 CCA1112 - Jul 13, 00:55 UTCJul 13, 01:15 UTC20m
2026-07-05 CCA1111 - Jul 5, 16:05 UTCJul 5, 16:30 UTC25m
2026-07-05 CCA1150 - Jul 5, 13:20 UTCJul 5, 13:30 UTC10m
2026-07-05 CCA1149 - Jul 5, 08:25 UTCJul 5, 08:40 UTC15m
2026-07-04 CCA1220 - Jul 4, 10:40 UTCJul 4, 11:00 UTC20m
2026-07-04 CCA1219 - Jul 4, 07:10 UTCJul 4, 07:35 UTC25m
2026-07-03 CCA1697 - Jul 3, 23:30 UTCJul 3, 23:40 UTC10m
2026-07-03 CCA9618 - Jul 3, 15:55 UTCJul 3, 16:10 UTC15m
2026-07-03 CCA9617 - Jul 3, 10:50 UTCJul 3, 11:00 UTC10m
2026-07-02 CCA1150 - Jul 2, 11:20 UTCJul 2, 11:35 UTC15m
2026-07-02 CCA1149 - Jul 2, 08:40 UTCJul 2, 09:00 UTC20m
2026-07-01 CCA1597 - Jul 1, 13:00 UTCJul 1, 13:10 UTC10m
2026-06-30 CCA9507 - Jun 30, 22:30 UTCJun 30, 22:40 UTC10m
2026-06-28 CCA1684 DQA → PEK Jun 28, 17:04 UTCJun 28, 17:55 UTC50m
2026-06-28 CCA1683 PEK → DQA Jun 28, 13:10 UTCJun 28, 13:19 UTC10m
2026-06-28 CCA1150 - Jun 28, 11:09 UTCJun 28, 11:29 UTC20m
2026-06-28 CCA1149 - Jun 28, 08:34 UTCJun 28, 08:50 UTC15m
2026-06-28 CCA1214 - Jun 28, 03:09 UTCJun 28, 03:25 UTC15m
2026-06-27 CCA1213 - Jun 27, 23:45 UTCJun 28, 00:04 UTC20m
2026-06-25 CCA1139 - Jun 25, 10:25 UTCJun 25, 10:45 UTC20m
2026-06-24 CCA1118 - Jun 24, 15:09 UTCJun 24, 15:29 UTC20m
2026-06-24 CCA1117 - Jun 24, 12:34 UTCJun 24, 12:54 UTC20m
2026-06-24 CCA1109 - Jun 24, 03:10 UTCJun 24, 03:19 UTC10m
2026-06-24 CCA1112 - Jun 24, 00:49 UTCJun 24, 01:04 UTC15m
2026-06-12 CCA8101 - Jun 12, 08:45 UTCJun 12, 08:55 UTC10m
2026-06-10 CCA8140 TSN → HET Jun 10, 08:25 UTCJun 10, 08:55 UTC30m

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

Mode-S 781F6E frequently asked

What is Mode-S code 781F6E?
781F6E is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-91AC.
Where is Mode-S 781F6E registered?
Mode-S code 781F6E is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F6E broadcasting right now?
No active broadcast right now. Last signal was Jul 22, 14:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F6E, octal 36017556, decimal 7,872,366.
What flights does 781F6E operate?
Mode-S 781F6E has broadcast 20 distinct callsigns, including CCA1149, CCA1150, CCA1213, CCA1118, CCA1117.