Apparatus

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sensors Mode-S transponder

781388

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-1278 · BOEING 737-800

Hex
781388
Octal
36011610
Decimal
7,869,320
Country
CN
Tail
B-1278
Type
B738
No current signal · last broadcast Jul 25, 06:35 UTC
Flights observed
63
Distinct callsigns
20
Country
CN
Last broadcast
Jul 25, 06:35 UTC

Last known position

Most recent position reported by Mode-S 781388.

Country allocation

The ICAO 24-bit address 781388 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
CUA2819 China United Airlines 9 2026-07-19
CUA872 China United Airlines 4 2026-07-01
CUA871 China United Airlines 4 2026-07-01
CUA5595 China United Airlines 4 2026-07-16
CUA877 China United Airlines 3 2026-07-25
CUA2126 China United Airlines 3 2026-07-24
CUA880 China United Airlines 2 2026-07-23
CUA870 - 2 2026-07-22
CUA869 - 2 2026-07-22
CUA5852 - 2 2026-07-12
CUA5851 - 2 2026-07-12
CUA5569 China United Airlines 2 2026-06-03
CUA5529 - 2 2026-05-09
CUA879 China United Airlines 1 2026-07-09
CUA5968 - 1 2026-07-24
CUA5692 - 1 2026-07-14
CUA5686 - 1 2026-07-16
CUA5685 - 1 2026-07-16
CUA5630 China United Airlines 1 2026-04-26
CUA5596 China United Airlines 1 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CUA877 PKX → VVO Jul 25, 06:25 UTCJul 25, 06:35 UTC10m
2026-07-25 CUA5580 YNJ → PKX Jul 25, 04:05 UTCJul 25, 04:15 UTC10m
2026-07-24 CUA5579 PKX → YNJ Jul 24, 23:40 UTCJul 24, 23:50 UTC10m
2026-07-24 CUA5968 - Jul 24, 13:30 UTCJul 24, 13:40 UTC10m
2026-07-24 CUA2126 DSN → PKX Jul 24, 02:45 UTCJul 24, 03:00 UTC15m
2026-07-23 CUA880 TAE → DSN Jul 23, 05:05 UTCJul 23, 14:30 UTC9h 25m
2026-07-22 CUA870 - Jul 22, 13:55 UTCJul 23, 03:30 UTC13h 35m
2026-07-22 CUA869 - Jul 22, 11:35 UTCJul 22, 12:00 UTC25m
2026-07-22 CUA5586 JMU → PKX Jul 22, 04:45 UTCJul 22, 04:55 UTC10m
2026-07-22 CUA5585 PKX → JMU Jul 22, 00:00 UTCJul 22, 00:10 UTC10m
2026-07-21 CUA2128 - Jul 21, 00:35 UTCJul 21, 00:50 UTC15m
2026-07-19 CUA2819 DSN → NKG Jul 19, 23:40 UTCJul 20, 00:05 UTC25m
2026-07-18 CUA870 - Jul 18, 13:15 UTCJul 19, 00:00 UTC10h 45m
2026-07-18 CUA869 - Jul 18, 10:50 UTCJul 18, 11:15 UTC25m
2026-07-16 CUA5595 PKX → DBC Jul 16, 23:44 UTCJul 16, 23:55 UTC10m
2026-07-16 CUA5686 - Jul 16, 14:10 UTCJul 16, 14:25 UTC15m
2026-07-16 CUA5685 - Jul 16, 08:00 UTCJul 16, 08:10 UTC10m
2026-07-14 CUA5692 - Jul 14, 07:50 UTCJul 14, 15:25 UTC7h 35m
2026-07-12 CUA5852 - Jul 12, 10:05 UTCJul 12, 10:15 UTC10m
2026-07-12 CUA5851 - Jul 12, 08:05 UTCJul 12, 08:25 UTC20m
2026-07-11 CUA2126 - Jul 11, 02:40 UTCJul 11, 02:50 UTC10m
2026-07-09 CUA880 TAE → DSN Jul 9, 05:00 UTCJul 10, 00:00 UTC19h 0m
2026-07-09 CUA879 DSN → TAE Jul 9, 02:50 UTCJul 9, 03:30 UTC40m
2026-07-06 CUA5509 PKX → JXA Jul 6, 23:15 UTCJul 6, 23:30 UTC15m
2026-07-06 CUA5521 - Jul 6, 11:05 UTCJul 6, 11:15 UTC10m
2026-07-06 CUA877 - Jul 6, 03:00 UTCJul 6, 03:10 UTC10m
2026-07-05 CUA877 - Jul 5, 05:40 UTCJul 5, 05:50 UTC10m
2026-07-04 CUA5595 PKX → DBC Jul 4, 23:35 UTCJul 4, 23:45 UTC10m
2026-07-04 CUA2126 - Jul 4, 02:10 UTCJul 4, 02:25 UTC15m
2026-07-02 CUA2819 - Jul 2, 23:40 UTCJul 3, 00:05 UTC25m
2026-07-01 CUA872 CJJ → DSN Jul 1, 13:00 UTCJul 1, 14:40 UTC1h 40m
2026-07-01 CUA871 DSN → CJJ Jul 1, 10:55 UTCJul 1, 11:30 UTC35m
2026-07-01 - - Jul 1, 00:30 UTCJul 1, 03:35 UTC3h 5m
2026-06-27 CUA2819 - Jun 27, 23:45 UTCJun 28, 00:09 UTC25m
2026-06-27 CUA872 CJJ → DSN Jun 27, 13:24 UTCJun 27, 13:49 UTC25m
2026-06-27 CUA871 DSN → CJJ Jun 27, 11:35 UTCJun 27, 12:04 UTC30m
2026-06-24 CUA5595 PKX → DBC Jun 24, 23:40 UTCJun 24, 23:54 UTC15m
2026-06-23 CUA2819 - Jun 23, 23:39 UTCJun 23, 23:59 UTC20m
2026-06-23 CUA2819 - Jun 23, 00:04 UTCJun 23, 23:59 UTC23h 55m
2026-06-22 CUA2819 - Jun 22, 23:39 UTCJun 23, 00:04 UTC25m
2026-06-21 CUA2819 - Jun 21, 23:44 UTCJun 22, 00:10 UTC25m
2026-06-17 CUA872 CJJ → DSN Jun 17, 13:05 UTCJun 17, 13:40 UTC35m
2026-06-17 CUA871 DSN → CJJ Jun 17, 11:05 UTCJun 17, 11:35 UTC30m
2026-06-13 CUA872 CJJ → DSN Jun 13, 13:15 UTCJun 13, 13:50 UTC35m
2026-06-13 CUA871 DSN → CJJ Jun 13, 11:15 UTCJun 13, 11:40 UTC25m
2026-06-09 CUA2819 DSN → NKG Jun 9, 23:35 UTCJun 10, 00:00 UTC25m
2026-06-07 CUA2819 DSN → NKG Jun 7, 23:40 UTCJun 8, 00:05 UTC25m
2026-06-03 CUA5569 PKX → DQA Jun 3, 05:05 UTCJun 3, 05:15 UTC10m
2026-05-30 CUA5006 - May 30, 15:00 UTCMay 30, 15:15 UTC15m
2026-05-30 CUA5005 - May 30, 12:40 UTCMay 30, 13:20 UTC40m

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-1278 page for operator, model, and routing details .

Mode-S 781388 frequently asked

What is Mode-S code 781388?
781388 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-1278.
Where is Mode-S 781388 registered?
Mode-S code 781388 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781388 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 06:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781388, octal 36011610, decimal 7,869,320.
What flights does 781388 operate?
Mode-S 781388 has broadcast 20 distinct callsigns, including CUA2819, CUA872, CUA871, CUA5595, CUA877.