Apparatus

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sensors Mode-S transponder

781676

ICAO 24-bit transponder address · allocated to China

Currently assigned to B-20A1 · BOEING 737-800

Hex
781676
Octal
36013166
Decimal
7,870,070
Country
CN
Tail
B-20A1
Type
B738
No current signal · last broadcast Jul 26, 10:15 UTC
Flights observed
41
Distinct callsigns
20
Country
CN
Last broadcast
Jul 26, 10:15 UTC

Last known position

Most recent position reported by Mode-S 781676.

Country allocation

The ICAO 24-bit address 781676 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
CUA5626 China United Airlines 3 2026-07-23
CUA5602 - 3 2026-07-18
CUA5290 - 3 2026-05-24
CUA5251 - 3 2026-06-18
CUA5595 China United Airlines 2 2026-06-23
CUA5521 China United Airlines 2 2026-06-07
CUA5308 China United Airlines 2 2026-07-25
CUA2996 - 2 2026-07-08
CUA5865 - 1 2026-06-30
CUA5852 China United Airlines 1 2026-07-17
CUA5851 - 1 2026-07-17
CUA5818 China United Airlines 1 2026-05-06
CUA5652 - 1 2026-06-20
CUA5651 - 1 2026-06-20
CUA5630 China United Airlines 1 2026-05-21
CUA5605 - 1 2026-07-25
CUA5579 China United Airlines 1 2026-05-06
CUA5535 - 1 2026-04-22
CUA5529 - 1 2026-07-14
CUA5525 - 1 2026-07-17

Recent flights last 41

DateFlightRouteTakeoffLandingDuration
2026-07-26 CUA5106 - Jul 26, 10:05 UTCJul 26, 10:15 UTC10m
2026-07-26 CUA5109 - Jul 26, 01:50 UTCJul 26, 02:00 UTC10m
2026-07-25 CUA5605 - Jul 25, 03:35 UTCJul 25, 04:00 UTC25m
2026-07-25 CUA5308 HUZ → PKX Jul 25, 01:15 UTCJul 25, 01:50 UTC35m
2026-07-24 CUA2917 PVG → HUZ Jul 24, 09:35 UTCJul 24, 14:35 UTC5h 0m
2026-07-23 CUA5626 XNN → PKX Jul 23, 10:05 UTCJul 23, 10:15 UTC10m
2026-07-21 CUA5116 - Jul 21, 13:05 UTCJul 21, 13:20 UTC15m
2026-07-21 CUA5115 - Jul 21, 10:55 UTCJul 21, 11:05 UTC10m
2026-07-19 CUA5626 XNN → PKX Jul 19, 09:35 UTCJul 19, 09:50 UTC15m
2026-07-18 CUA5602 - Jul 18, 14:10 UTCJul 18, 14:25 UTC15m
2026-07-17 CUA5852 SZX → PKX Jul 17, 10:00 UTCJul 17, 10:15 UTC15m
2026-07-17 CUA5851 - Jul 17, 08:20 UTCJul 17, 08:35 UTC15m
2026-07-17 CUA5525 - Jul 17, 00:20 UTCJul 17, 00:30 UTC10m
2026-07-16 CUA5602 - Jul 16, 14:05 UTCJul 16, 14:20 UTC15m
2026-07-14 CUA5529 - Jul 14, 12:10 UTCJul 14, 12:25 UTC15m
2026-07-14 CUA5626 - Jul 14, 10:05 UTCJul 14, 10:20 UTC15m
2026-07-10 CUA5102 - Jul 10, 12:50 UTCJul 10, 13:05 UTC15m
2026-07-08 CUA2996 - Jul 8, 07:55 UTCJul 8, 08:15 UTC20m
2026-07-07 CUA2996 - Jul 7, 08:00 UTCJul 7, 08:15 UTC15m
2026-06-30 CUA5865 - Jun 30, 13:35 UTCJun 30, 13:50 UTC15m
2026-06-23 CUA5595 PKX → DBC Jun 23, 23:55 UTCJun 24, 00:05 UTC10m
2026-06-20 CUA5652 - Jun 20, 13:24 UTCJun 20, 13:34 UTC10m
2026-06-20 CUA5651 - Jun 20, 06:10 UTCJun 20, 06:29 UTC20m
2026-06-18 CUA5252 - Jun 18, 15:05 UTCJun 18, 15:15 UTC10m
2026-06-18 CUA5251 - Jun 18, 12:10 UTCJun 18, 12:45 UTC35m
2026-06-11 CUA5595 PKX → DBC Jun 11, 00:10 UTCJun 11, 00:25 UTC15m
2026-06-07 CUA5521 PKX → HLD Jun 7, 10:05 UTCJun 7, 10:20 UTC15m
2026-06-06 CUA5521 PKX → HLD Jun 6, 09:45 UTCJun 6, 10:00 UTC15m
2026-06-05 CUA5602 YZY → PKX Jun 5, 14:55 UTCJun 5, 15:10 UTC15m
2026-05-24 CUA5290 - May 24, 03:40 UTCMay 24, 04:25 UTC45m
2026-05-21 CUA5630 XNN → PKX May 21, 13:20 UTCMay 21, 13:35 UTC15m
2026-05-13 CUA5251 - May 13, 08:45 UTCMay 13, 09:10 UTC25m
2026-05-06 CUA5818 ZUH → PKX May 6, 11:00 UTCMay 6, 11:10 UTC10m
2026-05-06 CUA5579 PKX → YNJ May 6, 00:25 UTCMay 6, 00:35 UTC10m
2026-05-02 CUA5308 HUZ → PKX May 2, 23:25 UTCMay 2, 23:35 UTC10m
2026-04-29 CUA5251 - Apr 29, 09:50 UTCApr 29, 10:00 UTC10m
2026-04-25 CUA5290 - Apr 25, 03:55 UTCApr 25, 04:30 UTC35m
2026-04-24 CUA5290 - Apr 24, 03:45 UTCApr 24, 04:20 UTC35m
2026-04-22 CUA5535 - Apr 22, 05:01 UTCApr 22, 05:10 UTC10m
2026-04-21 CUA5330 DSN → PKX Apr 21, 05:30 UTCApr 21, 05:45 UTC15m
2026-04-13 CUA5119 TFU → HUZ Apr 13, 02:50 UTCApr 13, 03:05 UTC15m

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-20A1 page for operator, model, and routing details .

Mode-S 781676 frequently asked

What is Mode-S code 781676?
781676 is an ICAO 24-bit transponder address. Allocated to China. Assigned to B-20A1.
Where is Mode-S 781676 registered?
Mode-S code 781676 is allocated to China (CN). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 781676 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 10:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 781676, octal 36013166, decimal 7,870,070.
What flights does 781676 operate?
Mode-S 781676 has broadcast 20 distinct callsigns, including CUA5626, CUA5602, CUA5290, CUA5251, CUA5595.