Apparatus

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sensors Mode-S transponder

781EC5

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-635M · COMAC ARJ-21-700 Xiangfeng

Hex
781EC5
Octal
36017305
Decimal
7,872,197
Country
CN
Tail
B-635M
Type
AJ27
No current signal · last broadcast 2d ago
Flights observed
58
Distinct callsigns
20
Country
CN
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 781EC5.

Country allocation

The ICAO 24-bit address 781EC5 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
CCA1220 - 5 2026-06-07
CCA1219 - 5 2026-06-08
CCA1282 - 4 2026-06-10
CCA1597 Air China 3 2026-06-07
CCA1281 - 3 2026-06-10
CCA1141 Air China 3 2026-06-07
CCA1139 Air China 3 2026-06-10
CCA1111 Air China 3 2026-05-21
CCA8192 Air China 2 2026-05-09
CCA8140 Air China 2 2026-05-09
CCA8139 Air China 2 2026-05-09
CCA1214 - 2 2026-05-26
CCA1213 - 2 2026-05-25
CCA1150 Air China 2 2026-05-21
CCA1149 Air China 2 2026-05-21
CCA1142 Air China 2 2026-06-08
CCA1118 Air China 2 2026-05-21
CCA1117 Air China 2 2026-05-21
CCA1112 Air China 2 2026-05-08
CCA1697 Air China 1 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-10 CCA1139 PEK → YCU Jun 10, 10:00 UTCJun 10, 10:15 UTC15m
2026-06-10 CCA1282 - Jun 10, 05:15 UTCJun 10, 05:45 UTC30m
2026-06-10 CCA1281 - Jun 10, 01:20 UTCJun 10, 01:45 UTC25m
2026-06-08 CCA1219 - Jun 8, 06:55 UTCJun 8, 11:10 UTC4h 15m
2026-06-08 CCA1142 DSN → PEK Jun 8, 02:05 UTCJun 8, 02:25 UTC20m
2026-06-07 CCA1141 PEK → DSN Jun 7, 23:25 UTCJun 7, 23:50 UTC25m
2026-06-07 CCA1597 PEK → WEH Jun 7, 12:50 UTCJun 7, 13:05 UTC15m
2026-06-07 CCA1220 - Jun 7, 10:55 UTCJun 7, 11:05 UTC10m
2026-06-07 CCA1219 - Jun 7, 07:20 UTCJun 7, 07:40 UTC20m
2026-06-04 CCA1220 - Jun 4, 11:20 UTCJun 4, 11:40 UTC20m
2026-06-04 CCA1219 - Jun 4, 07:45 UTCJun 4, 08:10 UTC25m
2026-06-03 CCA1139 PEK → YCU Jun 3, 10:00 UTCJun 3, 10:20 UTC20m
2026-06-03 CCA1282 - Jun 3, 05:00 UTCJun 3, 05:20 UTC20m
2026-06-03 CCA1281 - Jun 3, 01:25 UTCJun 3, 01:45 UTC20m
2026-05-30 CCA1282 - May 30, 05:10 UTCMay 30, 05:30 UTC20m
2026-05-29 CCA1220 - May 29, 10:30 UTCMay 29, 10:50 UTC20m
2026-05-29 CCA1219 - May 29, 06:55 UTCMay 29, 07:20 UTC25m
2026-05-28 CCA1697 PEK → DQA May 28, 23:25 UTCMay 28, 23:35 UTC10m
2026-05-28 CCA1597 PEK → WEH May 28, 12:40 UTCMay 28, 12:50 UTC10m
2026-05-28 CCA1127 PEK → YCU May 28, 04:40 UTCMay 28, 05:00 UTC20m
2026-05-28 CCA1142 DSN → PEK May 28, 01:40 UTCMay 28, 02:00 UTC20m
2026-05-27 CCA1141 PEK → DSN May 27, 22:50 UTCMay 27, 23:15 UTC25m
2026-05-27 CCA1282 - May 27, 05:04 UTCMay 27, 05:40 UTC35m
2026-05-27 CCA1281 - May 27, 01:34 UTCMay 27, 02:04 UTC30m
2026-05-26 CCA1214 - May 26, 03:35 UTCMay 26, 03:55 UTC20m
2026-05-25 CCA1213 - May 25, 23:54 UTCMay 26, 00:14 UTC20m
2026-05-21 CCA1111 PEK → HET May 21, 13:25 UTCMay 21, 13:40 UTC15m
2026-05-21 CCA1150 DSN → PEK May 21, 11:10 UTCMay 21, 11:20 UTC10m
2026-05-21 CCA1149 PEK → DSN May 21, 08:45 UTCMay 21, 08:55 UTC10m
2026-05-21 CCA1118 DSN → PEK May 21, 05:55 UTCMay 21, 06:15 UTC20m
2026-05-21 CCA1117 PEK → DSN May 21, 02:45 UTCMay 21, 03:05 UTC20m
2026-05-19 CCA1220 - May 19, 10:40 UTCMay 19, 11:00 UTC20m
2026-05-19 CCA1219 - May 19, 07:00 UTCMay 19, 07:25 UTC25m
2026-05-19 CCA1214 - May 19, 02:45 UTCMay 19, 03:05 UTC20m
2026-05-18 CCA1213 - May 18, 22:55 UTCMay 18, 23:15 UTC20m
2026-05-17 CCA1597 PEK → WEH May 17, 12:45 UTCMay 17, 12:55 UTC10m
2026-05-17 CCA1220 - May 17, 10:30 UTCMay 17, 10:50 UTC20m
2026-05-09 CCA8140 TSN → HET May 9, 08:30 UTCMay 9, 08:50 UTC20m
2026-05-09 CCA8192 DSN → TSN May 9, 05:40 UTCMay 9, 06:00 UTC20m
2026-05-09 CCA8139 HET → TSN May 9, 00:10 UTCMay 9, 00:30 UTC20m
2026-05-08 CCA1111 PEK → HET May 8, 13:30 UTCMay 8, 13:50 UTC20m
2026-05-08 CCA1109 - May 8, 02:55 UTCMay 8, 03:04 UTC10m
2026-05-08 CCA1112 HET → PEK May 8, 01:04 UTCMay 8, 01:24 UTC20m
2026-05-06 CCA8140 TSN → HET May 6, 08:20 UTCMay 6, 08:40 UTC20m
2026-05-06 CCA8192 DSN → TSN May 6, 05:35 UTCMay 6, 06:00 UTC25m
2026-05-05 CCA8139 HET → TSN May 5, 23:40 UTCMay 6, 00:01 UTC20m
2026-05-03 CCA1111 PEK → HET May 3, 13:00 UTCMay 3, 13:20 UTC20m
2026-05-03 CCA1150 DSN → PEK May 3, 11:05 UTCMay 3, 11:25 UTC20m
2026-05-03 CCA1149 PEK → DSN May 3, 08:20 UTCMay 3, 08:45 UTC25m
2026-05-01 CCA1139 PEK → YCU May 1, 10:00 UTCMay 1, 10:10 UTC10m

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-635M page for operator, model, and routing details .

Mode-S 781EC5 frequently asked

What is Mode-S code 781EC5?
781EC5 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-635M.
Where is Mode-S 781EC5 registered?
Mode-S code 781EC5 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781EC5 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781EC5, octal 36017305, decimal 7,872,197.
What flights does 781EC5 operate?
Mode-S 781EC5 has broadcast 20 distinct callsigns, including CCA1220, CCA1219, CCA1282, CCA1597, CCA1281.