Apparatus

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sensors Mode-S transponder

781F70

ICAO 24-bit transponder address · allocated to China

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

Hex
781F70
Octal
36017560
Decimal
7,872,368
Country
CN
Tail
B-91AE
Type
AJ27
No current signal · last broadcast Jul 26, 13:55 UTC
Flights observed
79
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 13:55 UTC

Last known position

Most recent position reported by Mode-S 781F70.

Country allocation

The ICAO 24-bit address 781F70 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
CCA1142 - 6 2026-07-10
CCA1141 - 6 2026-07-09
CCA1111 Air China 6 2026-07-26
CCA1150 - 5 2026-07-26
CCA1139 Air China 5 2026-07-23
CCA1220 - 4 2026-06-03
CCA1219 - 4 2026-06-13
CCA1149 Air China 4 2026-07-26
CCA1282 - 3 2026-07-14
CCA1281 - 3 2026-07-14
CCA1263 - 3 2026-06-08
CCA1213 - 3 2026-07-22
CCA1112 Air China 3 2026-07-22
CCA1109 - 3 2026-07-22
CCA1687 Air China 2 2026-06-07
CCA1593 - 2 2026-07-12
CCA1270 Air China 2 2026-07-24
CCA1264 - 2 2026-04-27
CCA1214 - 2 2026-07-23
CCA9684 - 1 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CCA1111 PEK → HET Jul 26, 13:35 UTCJul 26, 13:55 UTC20m
2026-07-26 CCA1150 - Jul 26, 11:20 UTCJul 26, 11:35 UTC15m
2026-07-26 CCA1149 PEK → DSN Jul 26, 08:30 UTCJul 26, 08:50 UTC20m
2026-07-26 CCA9662 HRB → HGH Jul 26, 04:00 UTCJul 26, 04:10 UTC10m
2026-07-24 CCA1270 ENY → PEK Jul 24, 09:55 UTCJul 24, 13:35 UTC3h 40m
2026-07-23 CCA1139 PEK → YCU Jul 23, 10:50 UTCJul 23, 11:10 UTC20m
2026-07-23 CCA1214 - Jul 23, 03:15 UTCJul 23, 03:35 UTC20m
2026-07-22 CCA1213 - Jul 22, 23:45 UTCJul 23, 00:10 UTC25m
2026-07-22 CCA1929 PEK → YIH Jul 22, 12:30 UTCJul 22, 12:55 UTC25m
2026-07-22 CCA1109 - Jul 22, 03:10 UTCJul 22, 03:20 UTC10m
2026-07-22 CCA1112 HET → PEK Jul 22, 01:00 UTCJul 22, 01:20 UTC20m
2026-07-14 CCA1111 - Jul 14, 13:20 UTCJul 14, 13:45 UTC25m
2026-07-14 CCA1150 - Jul 14, 11:20 UTCJul 14, 11:40 UTC20m
2026-07-14 CCA1149 - Jul 14, 08:30 UTCJul 14, 08:55 UTC25m
2026-07-14 CCA1282 - Jul 14, 05:20 UTCJul 14, 05:35 UTC15m
2026-07-14 CCA1281 - Jul 14, 01:40 UTCJul 14, 02:05 UTC25m
2026-07-13 CCA1139 - Jul 13, 10:00 UTCJul 13, 10:15 UTC15m
2026-07-13 CCA1282 - Jul 13, 05:05 UTCJul 13, 05:25 UTC20m
2026-07-13 CCA1281 - Jul 13, 01:25 UTCJul 13, 01:45 UTC20m
2026-07-12 CCA1593 - Jul 12, 12:55 UTCJul 12, 13:05 UTC10m
2026-07-12 CCA9684 - Jul 12, 09:15 UTCJul 12, 09:35 UTC20m
2026-07-12 CCA9683 - Jul 12, 06:05 UTCJul 12, 06:25 UTC20m
2026-07-12 CCA9661 - Jul 12, 00:40 UTCJul 12, 00:50 UTC10m
2026-07-10 CCA1139 - Jul 10, 10:10 UTCJul 10, 10:25 UTC15m
2026-07-10 CCA1559 - Jul 10, 04:50 UTCJul 10, 05:00 UTC10m
2026-07-10 CCA1142 - Jul 10, 01:45 UTCJul 10, 02:00 UTC15m
2026-07-09 CCA1141 - Jul 9, 23:00 UTCJul 9, 23:20 UTC20m
2026-07-09 CCA1270 - Jul 9, 09:45 UTCJul 9, 13:15 UTC3h 30m
2026-07-09 CCA1109 - Jul 9, 03:35 UTCJul 9, 03:50 UTC15m
2026-07-09 CCA1112 - Jul 9, 01:00 UTCJul 9, 01:15 UTC15m
2026-06-13 CCA1219 - Jun 13, 06:50 UTCJun 13, 07:15 UTC25m
2026-06-13 CCA1142 DSN → PEK Jun 13, 01:55 UTCJun 13, 02:15 UTC20m
2026-06-12 CCA1141 PEK → DSN Jun 12, 23:00 UTCJun 12, 23:25 UTC25m
2026-06-10 CCA1110 - Jun 10, 07:05 UTCJun 10, 07:15 UTC10m
2026-06-08 CCA1263 - Jun 8, 11:15 UTCJun 8, 15:15 UTC4h 0m
2026-06-08 CCA1282 - Jun 8, 05:15 UTCJun 8, 05:40 UTC25m
2026-06-08 CCA1281 - Jun 8, 01:30 UTCJun 8, 01:50 UTC20m
2026-06-07 CCA1593 PEK → YNT Jun 7, 12:40 UTCJun 7, 12:50 UTC10m
2026-06-07 CCA1687 PEK → DQA Jun 7, 05:00 UTCJun 7, 05:10 UTC10m
2026-06-07 CCA1142 DSN → PEK Jun 7, 01:30 UTCJun 7, 01:50 UTC20m
2026-06-06 CCA1141 PEK → DSN Jun 6, 22:50 UTCJun 6, 23:09 UTC20m
2026-06-04 CCA1139 PEK → YCU Jun 4, 10:25 UTCJun 4, 10:45 UTC20m
2026-06-04 CCA1142 DSN → PEK Jun 4, 01:35 UTCJun 4, 01:55 UTC20m
2026-06-03 CCA1141 PEK → DSN Jun 3, 22:50 UTCJun 3, 23:10 UTC20m
2026-06-03 CCA1220 - Jun 3, 10:30 UTCJun 3, 10:50 UTC20m
2026-06-03 CCA1219 - Jun 3, 06:50 UTCJun 3, 07:15 UTC25m
2026-06-02 CCA1139 PEK → YCU Jun 2, 10:10 UTCJun 2, 10:25 UTC15m
2026-05-25 CCA1111 PEK → HET May 25, 13:15 UTCMay 25, 13:35 UTC20m
2026-05-25 CCA1220 - May 25, 10:50 UTCMay 25, 11:10 UTC20m
2026-05-19 CCA1111 PEK → HET May 19, 13:20 UTCMay 19, 13:40 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-91AE page for operator, model, and routing details .

Mode-S 781F70 frequently asked

What is Mode-S code 781F70?
781F70 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-91AE.
Where is Mode-S 781F70 registered?
Mode-S code 781F70 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781F70 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 13:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781F70, octal 36017560, decimal 7,872,368.
What flights does 781F70 operate?
Mode-S 781F70 has broadcast 20 distinct callsigns, including CCA1142, CCA1141, CCA1111, CCA1150, CCA1139.