Apparatus

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sensors Mode-S transponder

780B81

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-5858 · BOEING 737-800

Hex
780B81
Octal
36005601
Decimal
7,867,265
Country
CN
Tail
B-5858
Type
B738
No current signal · last broadcast 5d ago
Flights observed
120
Distinct callsigns
20
Country
CN
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S 780B81.

Country allocation

The ICAO 24-bit address 780B81 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
CUA5858 China United Airlines 25 2026-07-22
CUA5857 - 25 2026-07-22
CUA5651 - 12 2026-07-25
CUA5652 - 10 2026-07-26
CUA5519 - 10 2026-06-29
CUA5686 China United Airlines 6 2026-07-22
CUA5685 China United Airlines 5 2026-07-21
CUA5876 China United Airlines 3 2026-05-29
CUA5852 China United Airlines 2 2026-05-25
CUA5811 China United Airlines 2 2026-06-15
CUA5595 - 2 2026-07-12
CUA5851 China United Airlines 1 2026-05-04
CUA5838 - 1 2026-05-03
CUA5818 - 1 2026-06-24
CUA5812 China United Airlines 1 2026-06-03
CUA5678 - 1 2026-06-04
CUA5677 - 1 2026-06-04
CUA5612 - 1 2026-07-16
CUA5611 - 1 2026-07-16
CUA5607 - 1 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CUA5652 - Jul 26, 06:50 UTCJul 26, 07:05 UTC15m
2026-07-25 CUA5651 - Jul 25, 23:20 UTCJul 25, 23:35 UTC15m
2026-07-25 CUA5652 - Jul 25, 06:40 UTCJul 25, 06:55 UTC15m
2026-07-24 CUA5651 - Jul 24, 23:30 UTCJul 24, 23:50 UTC20m
2026-07-24 CUA5652 - Jul 24, 06:55 UTCJul 24, 07:25 UTC30m
2026-07-23 CUA5651 - Jul 23, 23:25 UTCJul 23, 23:45 UTC20m
2026-07-23 CUA5652 - Jul 23, 06:50 UTCJul 23, 07:05 UTC15m
2026-07-22 CUA5651 - Jul 22, 23:15 UTCJul 22, 23:35 UTC20m
2026-07-22 CUA5686 HMI → PKX Jul 22, 14:20 UTCJul 22, 14:35 UTC15m
2026-07-22 CUA5858 SZX → PKX Jul 22, 03:55 UTCJul 22, 04:05 UTC10m
2026-07-22 CUA5857 - Jul 22, 02:15 UTCJul 22, 02:40 UTC25m
2026-07-21 CUA5686 - Jul 21, 14:30 UTCJul 21, 14:45 UTC15m
2026-07-21 CUA5685 PKX → HMI Jul 21, 08:05 UTCJul 21, 08:20 UTC15m
2026-07-19 CUA5652 - Jul 19, 07:05 UTCJul 19, 07:20 UTC15m
2026-07-18 CUA5651 - Jul 18, 23:15 UTCJul 18, 23:40 UTC25m
2026-07-17 CUA5651 - Jul 17, 23:14 UTCJul 17, 23:39 UTC25m
2026-07-17 CUA5652 - Jul 17, 06:45 UTCJul 17, 07:00 UTC15m
2026-07-16 CUA5651 - Jul 16, 23:25 UTCJul 16, 23:44 UTC20m
2026-07-16 CUA5562 - Jul 16, 16:09 UTCJul 16, 16:19 UTC10m
2026-07-16 CUA5561 - Jul 16, 11:30 UTCJul 16, 11:40 UTC10m
2026-07-16 CUA5612 - Jul 16, 08:55 UTCJul 16, 09:10 UTC15m
2026-07-16 CUA5611 - Jul 16, 00:50 UTCJul 16, 01:05 UTC15m
2026-07-15 CUA5858 - Jul 15, 06:50 UTCJul 15, 07:00 UTC10m
2026-07-15 CUA5857 - Jul 15, 02:50 UTCJul 15, 03:15 UTC25m
2026-07-14 CUA5858 - Jul 14, 04:00 UTCJul 14, 04:10 UTC10m
2026-07-14 CUA5857 - Jul 14, 02:15 UTCJul 14, 02:30 UTC15m
2026-07-13 CUA5652 - Jul 13, 12:40 UTCJul 13, 12:55 UTC15m
2026-07-13 CUA5651 - Jul 13, 05:20 UTCJul 13, 05:31 UTC10m
2026-07-13 CUA5596 - Jul 13, 03:05 UTCJul 13, 03:15 UTC10m
2026-07-12 CUA5595 - Jul 12, 23:45 UTCJul 12, 23:55 UTC10m
2026-07-12 CUA5858 - Jul 12, 04:50 UTCJul 12, 05:01 UTC10m
2026-07-12 CUA5857 - Jul 12, 03:10 UTCJul 12, 03:25 UTC15m
2026-07-11 CUA5652 - Jul 11, 06:55 UTCJul 11, 07:15 UTC20m
2026-07-10 CUA5651 - Jul 10, 23:30 UTCJul 10, 23:55 UTC25m
2026-07-10 CUA5652 - Jul 10, 06:45 UTCJul 10, 06:55 UTC10m
2026-07-09 CUA5651 - Jul 9, 23:30 UTCJul 9, 23:55 UTC25m
2026-07-09 CUA5858 - Jul 9, 04:10 UTCJul 9, 04:25 UTC15m
2026-07-09 CUA5857 - Jul 9, 02:00 UTCJul 9, 02:10 UTC10m
2026-07-08 CUA5686 - Jul 8, 14:25 UTCJul 8, 14:45 UTC20m
2026-07-08 CUA5685 - Jul 8, 08:00 UTCJul 8, 08:30 UTC30m
2026-07-07 CUA5607 - Jul 7, 14:05 UTCJul 7, 14:30 UTC25m
2026-07-07 CUA5858 - Jul 7, 08:00 UTCJul 7, 08:10 UTC10m
2026-07-07 CUA5857 - Jul 7, 03:05 UTCJul 7, 03:20 UTC15m
2026-07-06 CUA5652 - Jul 6, 13:30 UTCJul 6, 13:40 UTC10m
2026-07-05 CUA5595 PKX → DBC Jul 5, 23:45 UTCJul 5, 23:55 UTC10m
2026-07-05 CUA5857 - Jul 5, 02:05 UTCJul 5, 02:20 UTC15m
2026-07-04 CUA5686 - Jul 4, 14:55 UTCJul 4, 15:10 UTC15m
2026-07-04 CUA5685 - Jul 4, 08:40 UTCJul 4, 08:55 UTC15m
2026-07-03 CUA5858 - Jul 3, 03:55 UTCJul 3, 04:05 UTC10m
2026-07-03 CUA5857 - Jul 3, 01:55 UTCJul 3, 02:20 UTC25m

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-5858 page for operator, model, and routing details .

Mode-S 780B81 frequently asked

What is Mode-S code 780B81?
780B81 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-5858.
Where is Mode-S 780B81 registered?
Mode-S code 780B81 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 780B81 broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 780B81, octal 36005601, decimal 7,867,265.
What flights does 780B81 operate?
Mode-S 780B81 has broadcast 20 distinct callsigns, including CUA5858, CUA5857, CUA5651, CUA5652, CUA5519.